Pricing disclaimer: Agency pricing changes frequently. All figures in this article were accurate at the time of research (September 2026). Where pricing is not publicly listed, we note "Not public" rather than guessing. Contact each agency directly for current quotes.
Key Takeaways
- Cold email agencies range from $99/month self-serve data APIs to $50,000+ full-build engagements. The price gap reflects what you own at the end: a subscription, or a system.
- Signal-led outbound (using intent data, hiring triggers, funding events) consistently outperforms volume-based "blast and pray" campaigns on reply rate, meeting quality, and domain health.
- Build-to-own models transfer full infrastructure to the client. Managed-service models keep the client dependent on the agency for ongoing delivery.
- Deliverability infrastructure (SPF, DKIM, DMARC, domain warming, inbox rotation) determines whether your emails land in inboxes or spam. Most campaign failures trace back to this layer, not copy.
- The best agency for your business depends on your budget, internal sales capacity, and whether you need someone to run outbound forever or build a system you operate yourself.
Why We Wrote This (and a Disclosure)
Advanced Client is one of the eleven agencies reviewed in this article. We built cold outbound systems for 30+ B2B brands and generated 8 figures+ of pipeline. We know this space from the inside.
That perspective is the reason this article exists. Most "best cold email agency" lists are written by content marketers who have never sent a cold email, warmed a domain, or debugged a deliverability problem. The result is listicles that rank agencies by website design rather than client outcomes.
We wrote this to give buyers an honest comparison. We included agencies we compete with, agencies that serve different market segments, and agencies we actively recommend to prospects who are not the right fit for our model.
Our own profile uses the same structure and evaluation criteria as every other agency in this list. The case study data for Advanced Client comes from our published, client-approved results. The data for every other agency comes from their published case studies, third-party review platforms, and publicly available information.
Where we have a strong opinion, we say so. Where the data is missing, we flag the gap. Where an agency is better suited than us for a particular buyer, we name them directly.
How We Evaluated
We scored each agency across six criteria. These reflect what actually matters when you are choosing an agency to build or run your outbound pipeline, not marketing claims or website polish.
The Six Criteria
1. Published Proof (weighted 25%) Named clients, specific revenue figures, meeting counts, and timelines. Testimonials from real people with verifiable titles. Agencies that publish vague claims like "hundreds of happy clients" without naming a single one scored lower.
2. Deliverability Infrastructure (weighted 20%) Does the agency build proper email infrastructure? SPF, DKIM, DMARC authentication. Dedicated sending domains. Inbox warming protocols. Rotation across multiple inboxes. Agencies that send through shared or poorly warmed infrastructure damage your domain reputation.
3. System Architecture (weighted 20%) What tools does the agency use, and how sophisticated is the targeting? Clay-led signal detection, intent data layering, and CRM integration score higher than basic list-pull-and-blast approaches.
4. Client Ownership (weighted 15%) At the end of the engagement, who owns the infrastructure? Build-to-own models where the client retains all systems, data, and workflows score higher than managed models where the agency controls access.
5. Pricing Transparency (weighted 10%) Is pricing published or at least range-disclosed? Agencies with clear, upfront pricing models score higher than those requiring a sales call before revealing any cost information.
6. Breadth of Proof (weighted 10%) Does the agency show results across multiple industries and company sizes, or is the evidence concentrated in one niche?
Proof Tier Classification
We grouped agencies into three proof tiers based on the specificity and verifiability of their published results.
| Proof Tier | Definition | Requirement |
|---|---|---|
| Tier 1: Revenue-Attributed | Named client, specific revenue or pipeline figures, named contact with title | Must include at least one verifiable £/$ figure tied to a named company |
| Tier 2: Activity-Attributed | Named client, meeting counts or reply rates, but no revenue figures | Must include a named company and quantified activity metrics |
| Tier 3: Claim-Only | General statements ("hundreds of meetings"), aggregated stats, or anonymous case studies | No individually verifiable case study meeting our Tier 1 or Tier 2 standard |
Comparison Table
| Agency | Primary Model | Channels | Published Starting Price | Proof Tier | Ownership Model |
|---|---|---|---|---|---|
| Advanced Client | Build-to-own | Email, LinkedIn, Ads | $30K–$50K | Tier 1 | Client owns everything |
| Frontal | Managed + build | Email, LinkedIn, Ads | Not public (custom quotes) | Tier 1 | Hybrid |
| Belkins | Managed service | Email, LinkedIn, Calling | ~$5,000/mo | Tier 2 | Agency-operated |
| Instantly | Platform + services | $47/mo (platform) | Tier 3 | Client owns platform | |
| OutreachBloom | Done-for-you | Email only | $2,400/mo | Tier 3 | Agency-operated |
| SalesCaptain | Managed multi-channel | Email, LinkedIn | Not public | Tier 1 | Agency-operated |
| ColdIQ | Data API + services | Data layer | $99/mo (API) | Tier 2 | Client owns data access |
| Cleverly | Done-for-you | LinkedIn only | $397/mo | Tier 3 | Agency-operated |
| SalesHive | Outsourced SDR | Email, LinkedIn, Calling | ~$4,000/mo | Tier 2 | Agency-operated |
| Hypergen | Managed outbound | Email, RevOps | ~$5,000/mo | Tier 2 | Agency-operated |
| Salesforge | Platform + AI agent | Email, LinkedIn | $40/mo (platform) | Tier 3 | Client owns platform |
1. Advanced Client
At a Glance
| Detail | Info |
|---|---|
| Founded | UK-based |
| Primary Model | Build-to-own cold outbound + LinkedIn Ads |
| Channels | Cold email, LinkedIn outbound, LinkedIn Ads, phone |
| Tech Stack | Clay, Instantly, HeyReach, Prospeo, Trigify, WhiteWhale |
| Ownership | 100% client-owned infrastructure by day 120 |
| Starting Price | $30K–$50K engagement |
| Website | advancedclient.io |
What They Do
Advanced Client builds cold outbound systems that the client owns and operates independently. The model is not ongoing managed service. It is a build, run, and transfer engagement.
The team installs Clay-powered signal detection (hiring triggers, funding rounds, tech stack changes), builds the email and LinkedIn infrastructure from scratch, writes the copy, launches campaigns, and runs the system until it produces pipeline. Once the system is generating consistent results, they hand over every tool, workflow, template, and data source.
Delivery is founder-led. Tom Grainger and Louis Young work on every account. The agency limits capacity deliberately. This is not a volume play with junior account managers running dozens of clients.
The engagement typically covers ICP modelling in Clay, sending infrastructure build (domains, warming, authentication), multi-channel campaign creation, CRM integration, and full handover documentation.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| The Cosine | $500K–$850K retainer closed, 145 calls booked | Ongoing | Matt Schroeder, Co-Founder & CEO |
| Verifile | $312K revenue, 17 FTSE 100 meetings | System live in 28 days | Steven Davies, Sales Manager |
| Saulderson Media | Netflix deal closed, $650K+ contract value, 100+ meetings, agency subsequently acquired | First deal ~60 days | Suhit Amin, Founder & CEO |
| SmashCactus | $70K+ closed, 100+ calls, 200+ positive replies | 3 months, 21-day time to first ROI | Ashley Wright, CEO |
| Unlimited Viral Ideas | Month 1: 43 responses, 13 meetings, 4 deals, $12K upfront, $16K+ MRR | 14-day time to first close | Oscar Gracie, Founder |
| Aggregate | 8 figures+ pipeline, 2,000+ meetings, 30+ brands | Across all clients | Published on advancedclient.io |
Strengths
- Full ownership transfer. Every tool, workflow, data set, and template belongs to the client at engagement end. No recurring dependency.
- Signal-led targeting. Clay-powered buying signal detection (Trigify for job changes, WhiteWhale for intent, Prospeo for enrichment) means campaigns target people showing active buying behaviour, not static lists.
- Named, revenue-attributed proof. Every case study includes a named client, a named contact, specific figures, and a direct quote. The Cosine result ($500K–$850K retainer from cold outbound) is one of the strongest single-deal outcomes published by any cold email agency.
- Speed to pipeline. SmashCactus reached ROI in 21 days. Unlimited Viral Ideas closed their first deal in 14 days. Verifile had infrastructure live in 28 days from zero.
Considerations
- Price point. $30K–$50K is not accessible for companies below $500K ARR. This is built for businesses that can invest in infrastructure and have the sales capacity to work the pipeline.
- Limited capacity. Founder-led delivery means the agency cannot take on unlimited clients. There is often a waitlist.
- No SEO, content, or paid search. Advanced Client builds outbound and runs LinkedIn Ads. If you need organic search, content marketing, or Google Ads, you will need separate providers.
Pricing
$30K–$50K per engagement. No monthly retainer after handover. The client owns everything.
2. Frontal (formerly ColdIQ Agency)
At a Glance
| Detail | Info |
|---|---|
| Founded | Rebranded from ColdIQ Agency in 2026 |
| Primary Model | Managed demand generation + system build |
| Channels | Cold email, LinkedIn, Ads, Content |
| Tech Stack | Clay (Elite Studio Partner), HubSpot, Salesforce |
| Ownership | Hybrid: builds inside client CRM, ongoing management available |
| Starting Price | Not public (custom quotes, 3-month minimum) |
| Website | frontal.so |
What They Do
Frontal is the agency arm of ColdIQ, now operating as a separate entity. They hold Clay Elite Studio Partner status, the highest tier in Clay's partner programme. The agency has served 275+ companies.
Their model starts with a 90-day Foundation phase: ICP development, market mapping and tiering in Clay, account scoring by live buying signals, and decision-maker sourcing. Everything is built inside the client's CRM. They guarantee Foundation completion by week four, with a published $25K refund if they miss that deadline.
After the Foundation, Frontal runs ongoing campaigns across email, LinkedIn, and paid channels. The positioning is "outbound, ads, and content as one system." They are one of few agencies that combine Clay-powered data enrichment with multi-channel execution at scale.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| AirOps | $7.83M qualified pipeline, $1.52M closed-won | 10 months | Published on coldiq.com/case-studies |
| Design Pickle | 58 demos in 14 days (from ~10/week baseline) | 2 weeks | Published on coldiq.com/case-studies |
| Hemlane | 830 qualified contacts, 5.5% reply rate, 0.5% bounce rate | Single campaign | Published on coldiq.com/case-studies |
Strengths
- Clay Elite Partner. Deepest integration with Clay's platform. If your outbound strategy depends on Clay workflows, Frontal has more experience building them than most agencies.
- Revenue-attributed case studies. The AirOps result ($7.83M pipeline, $1.52M closed-won in 10 months) is a strong, named, revenue-verified proof point.
- CRM-native builds. Systems are built inside HubSpot or Salesforce, not in separate tools. This reduces handover friction and keeps data where the sales team already works.
Considerations
- Pricing opacity. No published pricing. Third-party sources estimate $3,000–$10,000/month, but setup fees and data credits add on top. Expect a sales process before you see numbers.
- ColdIQ/Frontal brand confusion. The rebranding from ColdIQ Agency to Frontal can create confusion. ColdIQ still exists as the data API product. Clarify which entity you are engaging with.
- Minimum commitment. Three-month minimum engagement. If you need a shorter test, this is not the right fit.
Pricing
Not public. Custom quotes based on scope. Three-month minimum commitment. The Foundation phase includes a $25K refund guarantee if not completed by week four.
3. Belkins
At a Glance
| Detail | Info |
|---|---|
| Founded | 2017 |
| Primary Model | Managed appointment setting |
| Channels | Cold email, LinkedIn, Calling, SMS |
| Tech Stack | Proprietary (Folderly for deliverability) |
| Ownership | Agency-operated |
| Starting Price | ~$5,000/mo |
| Website | belkins.io |
What They Do
Belkins is the largest dedicated B2B appointment setting agency by client count. They have served 1,000+ companies since 2017 and report 1M+ appointments booked across their client base.
The model is managed service. Belkins assigns a dedicated SDR team to your account, builds target lists, writes sequences, and runs multi-channel outreach across email, LinkedIn, phone, and SMS. Each client gets a dedicated account manager and industry-specialist SDRs.
Belkins also operates Folderly, their proprietary email deliverability tool, which handles inbox placement testing and spam monitoring. This vertical integration means they control the deliverability layer rather than relying on third-party tools.
Their sweet spot is mid-market to enterprise companies in technology, manufacturing, financial services, and healthcare. They report a 95% client retention rate.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Named investment platform client | 13 deals closed, ~$150K revenue, $434K projected pipeline | First year | Published on belkins.io/case-studies |
| Aggregate | 1M+ appointments, 1,000+ clients, 67,200+ deals | Since 2017 | Published on belkins.io |
| Aggregate | $10 returned for every $1 invested (claimed) | Across client base | Published on belkins.io |
Strengths
- Scale and track record. 1,000+ clients across nine years. 4.9/5 on Clutch with 230+ reviews. 4.8/5 on G2 with 90+ reviews. The volume of social proof is unmatched in this market.
- Multi-channel execution. Belkins runs email, LinkedIn, phone, and SMS as integrated sequences. Most cold email agencies are email-only or email-plus-LinkedIn.
- Proprietary deliverability tool. Folderly gives Belkins direct control over inbox placement, which most agencies outsource to third-party providers.
Considerations
- Agency dependency. This is a managed service. When the engagement ends, the outbound motion stops. You do not own the infrastructure.
- Variable quality by account team. Reviews note that results depend heavily on which SDR team is assigned. Some teams deliver consistently. Others require significant client involvement to stay on track.
- Ramp time. Multiple reviewers report that meaningful results take 60–90 days to materialise. If you need pipeline within 30 days, set expectations accordingly.
Pricing
Starts at approximately $5,000/month. Pay-per-appointment models available at $300–$800+ per meeting. Starter configuration: from $5,000/month for 1,500 leads, three outreach channels, and 100 guaranteed appointments per year. Exact pricing requires a sales consultation.
4. Instantly
At a Glance
| Detail | Info |
|---|---|
| Founded | Cold email platform, expanded to services |
| Primary Model | SaaS platform + managed agency services |
| Channels | Cold email |
| Tech Stack | Proprietary platform |
| Ownership | Client owns the platform account |
| Starting Price | $47/mo (platform), agency services priced separately |
| Website | instantly.ai |
What They Do
Instantly is primarily a cold email sending platform, not an agency. It handles email warm-up, campaign sequencing, inbox rotation, and deliverability monitoring. The platform offers unlimited sending accounts on every plan and access to a 450M+ lead database.
Instantly has expanded into agency-adjacent services: managed infrastructure (Light Speed with dedicated server and IP rotation), lead database access (SuperSearch), and campaign management support. For agencies managing 10+ client campaigns, they offer enterprise-grade infrastructure packages.
The distinction matters. Instantly gives you the tools. You (or your team) still need to build the strategy, write the copy, manage deliverability, and optimise campaigns. It is a platform, not a done-for-you service.
For companies with internal SDRs or sales ops who need sending infrastructure, Instantly is one of the strongest options available. For companies that need someone to build and run the entire outbound motion, Instantly alone is not sufficient.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Platform metrics | 450M+ lead database, unlimited sending accounts | Ongoing | Published on instantly.ai |
| Industry adoption | Used by majority of cold email agencies as sending infrastructure | Ongoing | Industry standard |
Strengths
- Sending infrastructure. Unlimited mailboxes, built-in warm-up, inbox rotation. The deliverability tooling is among the best available for cold email.
- Lead database. 450M+ contacts with email verification. Reduces the need for separate data providers for basic prospecting.
- Price-to-value ratio. $47/month for a full sending platform is significantly cheaper than any managed service. If you have the skills to run outbound yourself, the economics are strong.
Considerations
- Not an agency. Instantly is a tool. It does not write your copy, build your ICP, design your sequences, or manage your campaigns. Calling it a "cold email agency" stretches the definition.
- No strategy layer. The platform does not include Clay-style signal detection, intent data, or account scoring. You need to bring your own targeting logic.
- Support limitations. Platform support is not the same as having a dedicated account manager optimising your campaigns. If something breaks, you fix it.
Pricing
Platform plans: $47/month (Growth), $97/month (Hypergrowth), $197/month (Light Speed). Lead database: separate credit-based pricing. Agency plan: $555/month. Enterprise and managed infrastructure: custom pricing.
5. OutreachBloom
At a Glance
| Detail | Info |
|---|---|
| Founded | 2010 |
| Primary Model | Done-for-you cold email |
| Channels | Email only |
| Tech Stack | Not publicly disclosed |
| Ownership | Agency-operated |
| Starting Price | $2,400/mo |
| Website | outreachbloom.com |
What They Do
OutreachBloom is a done-for-you cold email agency. Email only. No LinkedIn, no calling, no multi-channel complexity. They handle list building, messaging, campaign execution, and reply management.
The agency has operated since 2010 and served over 1,000 businesses. That longevity in a market where most agencies are two to three years old is notable. They have survived multiple shifts in email deliverability standards, spam filter evolution, and market saturation.
The positioning is simple: hand over your ICP, and OutreachBloom runs cold email campaigns on your behalf. The price point ($2,400/month) makes it one of the most accessible done-for-you options in the market.
This is a fit for businesses that want cold email running without building internal capabilities, and that do not need LinkedIn outbound, phone follow-up, or Clay-powered signal targeting. The trade-off is simplicity for sophistication.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Aggregate | 1,000+ businesses served | Since 2010 | Published on outreachbloom.com |
| Industry mentions | Consistently ranked in "best cold email agency" lists across third-party review sites | 2026 | Multiple third-party publications |
Strengths
- Accessible price point. $2,400/month is the lowest published done-for-you price on this list. For companies testing cold email before committing to a larger investment, the financial risk is contained.
- Longevity. 16 years in business. OutreachBloom has survived longer than most agencies in this space, which suggests consistent delivery.
- Simplicity. Email only. No upsells to LinkedIn, calling, or paid ads. If you want one channel done well without scope creep, this model delivers that.
Considerations
- No published case studies with revenue attribution. We could not find named clients with specific revenue or meeting figures. The proof is aggregated ("1,000+ businesses") rather than individually verifiable.
- Email-only limitation. Modern B2B outbound typically requires multi-channel sequences. Email alone produces lower response rates than email plus LinkedIn plus phone, particularly for enterprise targets.
- No signal-based targeting. OutreachBloom does not advertise Clay integration, intent data, or buying signal detection. The targeting model appears to be traditional list-based outreach.
Pricing
$2,400/month. Month-to-month. Email only. Some packages extend to $2,500–$5,000/month depending on volume and scope.
6. SalesCaptain
At a Glance
| Detail | Info |
|---|---|
| Founded | Managed outbound agency |
| Primary Model | Managed multi-channel outbound |
| Channels | Cold email, LinkedIn |
| Tech Stack | Mailforge (infrastructure), intent signal tools |
| Ownership | Agency-operated |
| Starting Price | Not public |
| Website | salescaptain.io |
What They Do
SalesCaptain runs managed multi-channel outbound for B2B companies. Their model separates campaigns into three layers: AI-insight campaigns, intent-signal campaigns, and inbound reactivation campaigns. This layered structure means different prospect segments receive different outreach based on their buying signals.
The agency has an 80+ person team and serves clients across SaaS, recruitment, programmatic media, risk management, cybersecurity, and healthcare. Their infrastructure runs on Mailforge for email sending at scale.
SalesCaptain publishes more granular case study data than most managed-service agencies. Named clients, specific meeting counts, revenue figures, and conversion metrics are available on their website. This transparency is uncommon in the managed outbound space.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Global Recruitment Service | 501 booked appointments, 715 positive replies, 57 clients closed, $394K new ARR | 10 months | Published on salescaptain.io/case-studies |
| Riskwell | 32 booked appointments, 35% meeting booking ratio, 5–10 SQLs per week | 4 months | Published on salescaptain.io/case-studies |
| Pixofix (industry-reported) | 120+ meetings, $1.5M revenue | Not specified | Industry sources |
| Elastic (industry-reported) | $320K revenue | Not specified | Industry sources |
Strengths
- Revenue-attributed case studies. The Global Recruitment Service result (501 appointments, 57 closed clients, $394K ARR in 10 months) is one of the strongest published managed-service results on this list.
- Intent-layered campaigns. The three-layer campaign model (AI-insight, intent-signal, inbound reactivation) is more sophisticated than single-sequence approaches.
- Team size. 80+ person team provides capacity to handle multiple concurrent campaigns without stretching individual account managers thin.
Considerations
- Pricing opacity. No published pricing. You need a sales call to understand costs. Given the team size and service depth, expect mid-to-high-range retainers.
- Agency dependency. This is a managed service. The team runs outbound on your behalf. When the engagement ends, so does the pipeline.
- No published ownership transfer. SalesCaptain does not advertise a build-to-own or handover model. If owning the system is important to you, clarify this before signing.
Pricing
Not public. Contact SalesCaptain directly for quotes. Expect a multi-month commitment given the campaign ramp time shown in their case studies.
7. ColdIQ (Data API)
At a Glance
| Detail | Info |
|---|---|
| Founded | Same parent company as Frontal |
| Primary Model | Unified B2B data API |
| Channels | Data layer (feeds into any outbound channel) |
| Tech Stack | 40+ data providers, 700+ endpoints, single API |
| Ownership | Client owns data access |
| Starting Price | $99/mo |
| Website | coldiq.com |
What They Do
ColdIQ is a data API product, not an agency. One API key and one credit balance connect to 40+ B2B data providers through 700+ endpoints. You can search contacts, enrich company data, find work emails, and track buying signals (hiring, funding, tech stack changes) without holding individual contracts with each vendor.
This is the self-serve data layer for teams that want to build their own outbound infrastructure. ColdIQ provides the enrichment and signal detection. You provide the strategy, copy, and sending infrastructure.
ColdIQ is distinct from Frontal (profiled separately above), despite sharing the same parent company. ColdIQ is a software product. Frontal is the agency service. If you want someone to do the work, talk to Frontal. If you want the data to do it yourself, use ColdIQ.
The $99/month entry point makes ColdIQ one of the most accessible ways to get started with signal-led outbound without committing to agency-level spend.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Platform metrics | 40+ data providers, 700+ endpoints | Ongoing | Published on coldiq.com |
| Teikametrics (via managed service) | $300K+ pipeline | 9 months | Published on coldiq.com/case-studies |
Strengths
- Data aggregation. Instead of managing contracts with Apollo, ZoomInfo, Clearbit, and a dozen other providers, ColdIQ unifies them under one API. This saves procurement time and reduces total data spend for teams using multiple providers.
- Price point. $99/month is the lowest entry point on this list for any product with signal-detection capability. For early-stage companies or solo founders building outbound, this makes sophisticated data accessible.
- Flexibility. The API feeds into any stack. Clay, Make, Zapier, or custom builds. You are not locked into a specific workflow or sending platform.
Considerations
- Not a done-for-you service. ColdIQ provides data. You need to build the targeting logic, write the copy, set up sending infrastructure, and manage campaigns yourself. If you lack outbound experience, data alone will not produce results.
- Credit consumption complexity. With 40+ providers and 700+ endpoints, understanding credit costs per enrichment type requires upfront learning. Not all endpoints cost the same.
- Brand confusion with Frontal. The ColdIQ/Frontal relationship is unclear from the outside. Make sure you are buying the right product for your needs.
Pricing
Starts at $99/month for API access. Credit-based usage on top. Higher tiers available for volume users.
8. Cleverly
At a Glance
| Detail | Info |
|---|---|
| Founded | LinkedIn outbound specialist |
| Primary Model | Done-for-you LinkedIn outreach |
| Channels | LinkedIn only (Gold plan adds email) |
| Tech Stack | Proprietary LinkedIn automation |
| Ownership | Agency-operated |
| Starting Price | $397/mo |
| Website | cleverly.co |
What They Do
Cleverly runs done-for-you LinkedIn outbound. They manage connection requests, message sequences, and follow-ups from your LinkedIn profile. The Silver plan handles approximately 250 connection requests per week. The Gold plan increases to 500 per week and adds email follow-up.
The agency positions itself as a lead generation service for LinkedIn specifically. There is no cold email infrastructure build, no Clay integration, and no signal-based targeting. The model is volume-based LinkedIn outreach with templated messaging.
Cleverly requires access to your LinkedIn credentials to operate your account. This is standard for LinkedIn automation agencies but carries inherent risk: LinkedIn actively detects and restricts automated activity, and credential sharing violates LinkedIn's Terms of Service.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Platform claims | Some clients report 7–12 leads monthly | Ongoing | Third-party review aggregation |
| Review platforms | 4.5/5 Trustpilot, 3.8/5 G2 | 2026 | Trustpilot, G2 |
Strengths
- Low entry price. $397/month is the second-lowest published price on this list (after ColdIQ's $99 API). For companies testing LinkedIn outbound on a tight budget, the financial barrier is low.
- LinkedIn specialisation. Cleverly focuses exclusively on LinkedIn. If LinkedIn is your only outbound channel and you want someone else managing it, the specialisation is relevant.
- Simple onboarding. The model is straightforward: provide your LinkedIn credentials, define your target audience, and Cleverly runs the outreach.
Considerations
- Credential security concerns. Multiple reviewers flag that Cleverly requests and stores LinkedIn login credentials in plain text. This is a security risk, particularly for executives whose LinkedIn accounts contain sensitive business relationships.
- No-refund policy. Regardless of results, Cleverly does not offer refunds. Multiple documented cases on G2 and Trustpilot describe clients paying for three months (the minimum commitment) and receiving zero leads with no recourse.
- Below-benchmark performance. Third-party benchmarks place Cleverly's typical reply rates at 8–15%, versus 15–25% industry average for personalised LinkedIn outreach. The gap suggests templated messaging rather than account-specific personalisation.
Pricing
Silver: ~$397/month (250 connection requests/week). Gold: ~$697/month (500 requests/week + email). 90-day minimum commitment. No refund policy.
9. SalesHive
At a Glance
| Detail | Info |
|---|---|
| Founded | 2016 |
| Primary Model | Outsourced SDR team |
| Channels | Cold email, LinkedIn, Cold calling |
| Tech Stack | Proprietary (eMod AI personalisation, Power Dialer) |
| Ownership | Agency-operated |
| Starting Price | ~$4,000/mo |
| Website | saleshive.com |
What They Do
SalesHive provides outsourced SDR teams for B2B companies. The model is full-service: cold email, LinkedIn outreach, and cold calling handled by SalesHive's in-house team of 200+ US-based professionals.
They operate proprietary AI technology (eMod for email personalisation, Power Dialer for calling) and position themselves as an AI-powered outbound agency. The AI positioning is real but no longer differentiating in 2026, as most agencies now offer some form of AI-driven personalisation.
SalesHive's strongest selling point is the combination of email outbound with actual phone calls. Many agencies in this list are email-only or email-plus-LinkedIn. SalesHive adds a dedicated calling layer, which can be valuable for industries where phone conversations drive deal progression.
Month-to-month contracts (no long-term lock-in) differentiate SalesHive from agencies requiring 3–6 month commitments.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Aggregate claims | 200+ team members, proprietary AI tools | Ongoing | Published on saleshive.com |
| Review platforms | Clutch listed, mixed reviews | 2026 | Clutch, G2, third-party sites |
Strengths
- Month-to-month contracts. No long-term commitment required. If results disappoint after 30 days, you can exit without paying for months of unused service.
- Phone channel included. SalesHive is one of few agencies on this list that includes dedicated cold calling alongside email and LinkedIn. For industries where phone outreach converts, this is meaningful.
- US-based SDRs. All SDRs are US-based, which matters for companies selling to North American enterprise buyers who expect native English communication during business hours.
Considerations
- Quality control concerns. A March 2026 review described SDRs using the wrong company name and running an incorrect CRM script for 13 calling days before the error was caught. This suggests gaps in quality assurance processes.
- Limited published proof. SalesHive does not publish named case studies with specific revenue or meeting figures on their website. The proof is primarily aggregated claims and review platform ratings.
- AI claims vs reality. "AI-powered" is a common positioning in 2026. SalesHive's eMod and Power Dialer are proprietary, but the actual performance improvement over non-AI competitors is not publicly quantified.
Pricing
$4,000–$12,000/month depending on scope. Month-to-month contracts. Some sources report up to $15,000+/month for enterprise configurations.
10. Hypergen
At a Glance
| Detail | Info |
|---|---|
| Founded | B2B cold email specialist |
| Primary Model | Managed outbound + RevOps |
| Channels | Cold email, Revenue operations |
| Tech Stack | Not publicly disclosed |
| Ownership | Agency-operated |
| Starting Price | ~$5,000/mo |
| Website | hypergen.io |
What They Do
Hypergen pairs cold email outbound with revenue operations. The agency runs outreach campaigns and then works on the CRM and pipeline infrastructure behind them. This combination of outbound execution and RevOps support is uncommon. Most agencies handle the campaign layer but leave CRM configuration, pipeline stages, and reporting to the client.
The agency claims most clients secure their first meeting within eight days of launch. They have served 120+ companies.
Hypergen positions itself as an intent-based cold email agency, meaning campaigns are triggered by prospect behaviour signals rather than static list criteria. This aligns with the broader industry shift toward signal-led outbound.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Aggregate | 120+ companies served | Ongoing | Published on hypergen.io |
| Review platforms | 4.7/5 on G2 | 2026 | G2 |
| Client claims | First meeting within 8 days (typical) | Per campaign | Published on hypergen.io |
Strengths
- Outbound plus RevOps. The combination of campaign execution with CRM and pipeline work means Hypergen addresses a gap most agencies ignore. If your CRM is messy and your pipeline stages are undefined, Hypergen fixes both alongside running outbound.
- Strong G2 rating. 4.7/5 on G2 is among the highest on this list. Reviewers praise lead quality, professionalism, and communication.
- Intent-based targeting. Signal-triggered campaigns (not static lists) align with current best practices for cold email.
Considerations
- Six-month minimum. The minimum engagement is six months at $5,000/month. That is a $30,000 commitment before you can exit. If the first two months disappoint, you are still locked in for four more.
- Limited published case study detail. Hypergen has 120+ client logos and strong G2 reviews, but we could not find named case studies with specific revenue or pipeline figures. The proof is activity-level (meetings booked) rather than revenue-attributed.
- Pricing at the higher end. $5,000/month with a six-month lock-in puts the minimum total investment at $30,000. This matches Advanced Client's starting price, but without the ownership transfer.
Pricing
Starts at ~$5,000/month. Six-month minimum engagement ($30,000 minimum total commitment).
11. Salesforge
At a Glance
| Detail | Info |
|---|---|
| Founded | Cold email automation platform |
| Primary Model | SaaS platform + AI SDR agent |
| Channels | Cold email, LinkedIn |
| Tech Stack | Proprietary (Agent Frank AI SDR) |
| Ownership | Client owns platform account |
| Starting Price | $40/mo (platform), $416/mo (AI agent) |
| Website | salesforge.ai |
What They Do
Salesforge is a cold email platform with an AI agent add-on called Agent Frank. The platform handles email sequencing, inbox warm-up (included at no extra cost), and LinkedIn outreach from a single interface. Unlimited mailboxes and LinkedIn senders with no seat-based pricing.
Agent Frank is the agency-replacement play. It is an AI SDR that automates prospect research, email personalisation, send scheduling, and follow-up sequences. The pitch: replace a human SDR with an AI agent at a fraction of the cost.
Like Instantly, Salesforge is a platform first and a service second. The AI agent adds automation, but strategic decisions (ICP definition, offer positioning, sequence architecture) still require human input. Agent Frank executes. It does not strategise.
A 14-day free trial is available (25 emails, 10 contacts, 10 validations), which lets you test the platform before committing.
Evidence
| Client | Outcome | Timeline | Source |
|---|---|---|---|
| Platform metrics | Unlimited mailboxes, built-in warm-up, AI personalisation | Ongoing | Published on salesforge.ai |
| Review platforms | 4.5/5 on G2 and Trustpilot | 2026 | G2, Trustpilot |
Strengths
- All-in-one platform. Email sequencing, warm-up, LinkedIn outreach, and AI personalisation in one tool. Reduces the need for multiple subscriptions (Instantly for sending + Lemlist for sequences + separate warm-up tool).
- No seat-based pricing. Unlimited mailboxes and LinkedIn senders. For teams scaling outbound across many sending accounts, this eliminates per-seat cost escalation.
- AI agent option. Agent Frank at $416/month is cheaper than hiring an SDR or engaging a managed-service agency. For companies that want automation over human service, the price-to-capability ratio is interesting.
Considerations
- Confusing product stack. Salesforge's product lineup (Salesforge, Agent Frank, Mailforge, Infraforge) is not intuitive. Understanding which product does what requires research before purchasing.
- Unreliable multi-channel sequencer. Reviews note that the LinkedIn sequencing component is less reliable than the email side. If multi-channel is your priority, test the LinkedIn features during the trial period.
- Agent Frank limitations. AI SDR tools in 2026 can automate sending but cannot replicate the strategic judgement of an experienced outbound operator. If your ICP is complex or your offer requires nuanced positioning, Agent Frank alone will not solve the problem.
Pricing
Platform: $40/month (Pro), $80/month (Growth). Agent Frank: $416/month. All prices billed annually (monthly billing costs more). 14-day free trial available.
A Practitioner's Perspective on Cold Email in 2026
Most agencies on this list will tell you the same thing in the sales process: "We build targeted lists, write personalised emails, and book you meetings." The differences only become visible once campaigns are running and you are looking at inbox placement rates, reply quality, and whether the meetings actually convert.
Here is what matters from inside the work.
Deliverability Is the Foundation
Every cold email campaign sits on top of email infrastructure. SPF, DKIM, and DMARC records authenticate your sending domains. Inbox warming builds sender reputation over weeks before any cold email is sent. Inbox rotation distributes volume across multiple mailboxes to avoid triggering spam filters.
Get this layer wrong, and nothing else matters. The best copy in the world landing in spam folders produces zero replies. The most sophisticated Clay workflow targeting ideal buyers achieves nothing if Google flags your domain.
This is where most agency engagements fail, and where most buyers lack the technical knowledge to evaluate what is happening. Ask any prospective agency: how many sending domains will you set up? What is the warming protocol? How do you monitor inbox placement? What happens if a domain gets flagged?
If the answers are vague, the infrastructure will be vague.
Signal-Led vs Volume-Based Outbound
The market has split into two camps.
Volume-based outbound pulls a static list from a data provider (Apollo, ZoomInfo, or similar), writes a generic sequence, and blasts it to thousands of contacts. The theory is that even a 1% reply rate on 10,000 emails produces 100 conversations. In practice, volume sending damages domain reputation, trains spam filters against your domains, and produces low-quality meetings with people who replied out of curiosity rather than buying intent.
Signal-led outbound uses tools like Clay, Trigify, and WhiteWhale to detect buying signals: a company just raised funding, hired a new VP of Sales, adopted a competitor's technology, or posted a job listing that indicates a problem your product solves. Campaigns target people showing active buying behaviour, with messaging that references the specific signal.
The difference in output quality is significant. Signal-led campaigns consistently produce higher reply rates, better meeting quality, and faster sales cycles. They also send lower volume, which protects domain reputation.
Agencies using Clay-powered signal detection (Advanced Client, Frontal, ColdIQ's data feeds) sit in the signal-led camp. Agencies running high-volume appointment setting (Belkins at scale, SalesHive, OutreachBloom) tend toward the volume model. Neither is inherently wrong. The right choice depends on your average deal size, sales cycle length, and tolerance for domain risk.
The Domain Reputation Damage Pattern
This pattern repeats across the industry: a company hires a cold email agency, the agency sends through poorly warmed domains or shared infrastructure, reply rates start at 3–5% and decline to sub-1% within 60 days, and the company exits the engagement with damaged domain reputation that takes months to recover.
The damage is invisible during the first few weeks. Emails land in inboxes. Reply rates look acceptable. Then spam filters learn. Inbox placement drops. By the time the client notices, the domain reputation has been degraded.
Ask how the agency handles domain health monitoring. Ask what happens when inbox placement drops below 80%. Ask whether they use dedicated domains per client or share infrastructure across accounts. The answers reveal whether the agency treats deliverability as a technical discipline or an afterthought.
Why "Guaranteed Meetings" Usually Means Low-Quality Meetings
Several agencies on this list offer meeting guarantees: "We guarantee X meetings per month or you do not pay." The guarantee sounds risk-free. In practice, it creates a perverse incentive.
When an agency is contractually obligated to deliver a meeting count, the easiest path is to lower targeting criteria. A "meeting" with someone who vaguely matches your ICP and agreed to a call because the email was persistent counts toward the guarantee. A meeting with a decision-maker at a company showing buying signals who has budget authority and timeline urgency does not happen by volume.
Meeting quantity and meeting quality are inversely correlated when agencies are incentivised by count alone. Ask how the agency defines a "qualified meeting." Ask what percentage of guaranteed meetings convert to pipeline. If they cannot answer the second question, the guarantee is a lead quality risk dressed as a safety net.
When Infrastructure Matters More Than Copy
The SmashCactus case illustrates this. Advanced Client built the full sending infrastructure (domains, warming, authentication, inbox rotation) before sending a single cold email. The system went live on day one with properly warmed domains, authenticated records, and distributed sending. First ROI arrived on day 21.
Most agencies start sending before infrastructure is fully built because clients want to see activity. The first two weeks of a campaign should be invisible to the client: domain setup, DNS configuration, warming protocols, deliverability testing. If your agency is sending cold emails in week one, the infrastructure was not built properly.
When Advanced Client Is NOT the Right Fit
We believe in the build-to-own model. We also know it is not right for every company.
If your budget is under $10,000 and you want email-only outbound running quickly, OutreachBloom at $2,400/month is a better starting point. The targeting will not be as sophisticated, but the price-to-speed ratio is strong for early-stage testing.
If you want to build outbound yourself and need data, ColdIQ at $99/month gives you access to 40+ data providers through one API. Combine it with Instantly for sending and you have a functional self-serve stack for under $200/month.
If you need high-volume appointment setting across multiple channels with a large SDR team, Belkins has the scale and track record to deliver consistent meeting counts. Their model is not build-to-own, but for companies that want outbound managed permanently, the managed model works.
If you need a platform with AI automation and do not want to pay for human services, Instantly or Salesforge give you the tools to run everything internally.
Advanced Client is the right fit for B2B companies with $500K+ ARR, sales capacity to work qualified pipeline, and a preference for owning the outbound system rather than renting it.
Decision Matrix: Match Your Situation to an Agency
| Your Situation | Recommended Agency | Why |
|---|---|---|
| "I have tried cold email but it felt spammy and did not work" | Advanced Client | Infrastructure-first build fixes the deliverability problems that made previous attempts fail. Signal-led targeting replaces the spray-and-pray feeling. |
| "Our SDRs are sending but reply rates are terrible" | Frontal or ColdIQ API | Clay-powered signal detection and enrichment upgrades your targeting. Frontal builds it for you. ColdIQ gives you the data to fix it yourself. |
| "I do not have a sales team, it is just me" | OutreachBloom or Instantly | OutreachBloom runs email for you at $2,400/month. Instantly gives you the platform to do it yourself at $47/month. Both work for solo founders. |
| "All our revenue comes from word of mouth, and we need to diversify" | Advanced Client or SalesCaptain | You need a full outbound system built from zero. Advanced Client builds and transfers it. SalesCaptain manages it ongoing. |
| "We are an agency and need consistent pipeline for ourselves" | Advanced Client | The SmashCactus and Saulderson Media results were both agency founders. The build-to-own model means you keep running outbound after the engagement ends. |
| "We need meetings booked at scale across multiple channels" | Belkins | 1,000+ clients. Email, LinkedIn, phone, SMS. The largest appointment-setting operation on this list with the most social proof at volume. |
| "We want to test cold email before committing to a large investment" | OutreachBloom or Cleverly | OutreachBloom at $2,400/month (email) or Cleverly at $397/month (LinkedIn) are the lowest-cost ways to test outbound with agency support. |
| "We have SDRs and need better data and signals, not more services" | ColdIQ | $99/month API access to 40+ data providers. Plug it into your existing stack. No agency dependency. |
| "We want an outsourced SDR team with phone outreach included" | SalesHive | US-based SDRs, cold calling included, month-to-month contracts. The only agency on this list combining email, LinkedIn, and phone at scale with no long-term lock-in. |
| "We need outbound plus CRM and RevOps support together" | Hypergen | Hypergen pairs cold email with revenue operations work. If your CRM and pipeline stages need fixing alongside outbound, they address both. |
5-Step Framework for Choosing a Cold Email Agency
Step 1: Define What You Own at the End
Before evaluating agencies, decide whether you want to own the outbound system or rent it. Build-to-own models (Advanced Client, Frontal's Foundation phase) transfer infrastructure to you. Managed models (Belkins, SalesCaptain, SalesHive) keep running as long as you pay. Platforms (Instantly, Salesforge, ColdIQ) give you tools you own but must operate.
If your company plans to run outbound as a permanent growth channel, ownership matters. If outbound is a short-term experiment, managed service reduces the upfront commitment.
Step 2: Audit the Proof
Request case studies with named clients, specific figures, and timelines. Ask for references you can call. Any agency unwilling to connect you with a current or former client is a risk.
Check proof tiers. Revenue-attributed results (named client, specific revenue figure, named contact) are strongest. Activity-attributed results (named client, meeting counts) are useful but less conclusive. Aggregated claims ("hundreds of meetings booked") tell you very little about what your experience will look like.
Step 3: Test the Deliverability Knowledge
Ask the agency to explain their domain warming protocol. Ask how many sending domains they set up per client. Ask what their inbox placement monitoring process looks like. Ask what happens when a domain gets flagged.
If the agency cannot speak fluently about SPF, DKIM, DMARC, warming schedules, and inbox rotation, they are outsourcing the most critical layer of cold email to tools they do not fully understand.
Step 4: Evaluate the Targeting Model
Static list-based targeting (pull contacts from a database and email them) is the baseline. Signal-led targeting (detect buying signals and target companies showing active purchase behaviour) is the higher standard.
Ask what data sources the agency uses. Ask how they define "qualified prospect." Ask whether campaigns are triggered by signals or run on a fixed schedule. The answers reveal whether you will be sending relevant emails to interested buyers or generic emails to a static list.
Step 5: Run a 90-Day Evaluation
No cold email agency produces meaningful results in 30 days. Domain warming takes 2–3 weeks. List building and enrichment take another week. First campaigns launch in week 3–4. Meaningful data on reply rates, meeting quality, and pipeline conversion takes another 30–60 days.
Set a 90-day evaluation window with clear metrics: reply rate, positive reply rate, meetings booked, meeting-to-opportunity conversion rate, and pipeline value generated. Evaluate the agency against these numbers, not against promises made during the sales process.
Frequently Asked Questions
What does a cold email agency do?
A cold email agency builds and manages outbound email campaigns to generate sales meetings for B2B companies. The typical scope includes: identifying your ideal customer profile, building targeted prospect lists, setting up email sending infrastructure (domains, authentication, warming), writing email sequences, managing campaigns, and handling replies. Some agencies extend into LinkedIn outreach, cold calling, and paid advertising. The core deliverable is qualified meetings with potential buyers.
Which are the best cold email agencies in 2026?
The best agency depends on your budget, team size, and whether you want to own the system or have it managed. For build-to-own outbound systems with the strongest revenue-attributed proof, Advanced Client and Frontal lead. For high-volume managed appointment setting, Belkins has the largest track record. For budget-friendly email-only execution, OutreachBloom is the most accessible. For self-serve data and platform infrastructure, ColdIQ ($99/month API) and Instantly ($47/month platform) offer the lowest entry points. This article profiles eleven agencies across the full spectrum.
How much does a cold email agency cost?
Costs range widely. Self-serve platforms start at $40–$99/month (Salesforge, ColdIQ, Instantly). Done-for-you email-only services start at $2,400/month (OutreachBloom). LinkedIn-only agencies start at $397/month (Cleverly). Managed multi-channel agencies typically charge $4,000–$12,000/month (Belkins, SalesHive, Hypergen). Full build-to-own engagements range from $30,000–$50,000 (Advanced Client). The price differences reflect scope: platform access, campaign management, multi-channel execution, and system ownership each add cost.
How do you evaluate a cold email agency?
Focus on six areas: published proof with named clients and specific figures, deliverability infrastructure knowledge, targeting sophistication (signal-led vs static lists), client ownership of systems at engagement end, pricing transparency, and breadth of results across industries. Ask for references. Test their deliverability knowledge by asking about SPF, DKIM, DMARC, domain warming protocols, and inbox placement monitoring. Any agency that cannot speak fluently about these topics is a risk.
What is the difference between managed cold email and build-to-own?
Managed cold email agencies run outbound on your behalf for a monthly retainer. They handle everything. When you stop paying, the outbound stops. Build-to-own agencies construct the entire outbound system (infrastructure, workflows, data sources, templates) and transfer ownership to the client. After the engagement, the client operates the system independently with no ongoing agency fees. Managed models trade cost for convenience. Build-to-own models require more upfront investment but eliminate long-term dependency.
How long before cold email produces results?
Expect 2–3 weeks for infrastructure setup (domain purchase, DNS configuration, warming). First campaigns launch in weeks 3–4. Initial replies arrive in weeks 4–6. Meaningful pipeline data (enough meetings to evaluate quality and conversion) requires 60–90 days. Agencies promising results in the first week are either skipping infrastructure steps or defining "results" as vanity metrics (emails sent, open rates) rather than pipeline metrics (meetings booked, revenue generated). The SmashCactus case study (21-day time to first ROI) is among the fastest documented outcomes, and it was achieved because infrastructure was built correctly from day one.
Is cold email still effective in 2026?
Yes. Cold email remains one of the most cost-effective B2B pipeline channels when executed properly. The key phrase is "when executed properly." Gmail and Microsoft spam filters are more aggressive than ever. Generic, high-volume campaigns get flagged quickly. Signal-led campaigns with proper infrastructure, personalised messaging, and controlled sending volumes continue to produce strong results. Belkins reports $10 returned for every $1 invested across their client base (source: belkins.io). Advanced Client's case studies show pipeline outcomes ranging from $70K (SmashCactus, 3 months) to $500K–$850K (The Cosine, single retainer closed). The channel works. The execution standard required to make it work has risen.
Verdict
There is no single best cold email agency. There is the best agency for your specific situation.
If you want a system you own and operate, with the strongest revenue-attributed case studies in the market, Advanced Client is the clear choice for companies with the budget and sales capacity to support it.
If you want managed appointment setting at scale with the deepest track record, Belkins has served more clients than anyone else on this list.
If you want to test cold email at the lowest possible cost, OutreachBloom ($2,400/month for done-for-you email) or Instantly ($47/month for self-serve platform) remove the financial barrier.
If you want data infrastructure to power your own outbound, ColdIQ at $99/month is the most cost-effective path to signal-led targeting.
Every agency on this list serves a different buyer. The right choice starts with understanding what you need: ownership or convenience, volume or precision, budget testing or full-scale build. Match the agency to the need, and cold email remains one of the most productive B2B growth channels available in 2026.