Compare the best cold email agencies for B2B startups in 2027, from QC Growth to Belkins and Cleverly. See pricing and fit, then book a strategy call.
Disclosure: QC Growth publishes this comparison and appears in it at number one. Prices and features for other firms come from each firm's own site or contact form, and many figures are the firms' own claims. Verify any ranking you read, including this one.
| Company | Best For | Key Strengths | Pricing |
|---|---|---|---|
| QC Growth | Seed to Series A technical founders in devtools, AI and healthtech | Embedded operator pod, signal-driven outbound, you keep the system | $7.5k to $25k per month, 6 to 12 month terms |
| Outbound System | Startups that want email, calling and LinkedIn on a flat fee | Published plans, month-to-month terms, copy, lists and inbox setup included | $1,499, $2,499 or $3,999 per month by send volume |
| Cleverly | Founders who want LinkedIn and cold email run for them | Email, calling and LinkedIn, dedicated account manager, weekly reporting | Not published on the page reviewed |
| Belkins | Teams that want email inside a large multi-channel program | Email, calls, LinkedIn, SMS and ads, deliverability consulting | Quote only |
| CIENCE | Teams that want to pay per held meeting | Month-to-month terms, commission per held meeting, 115+ case studies | Fixed monthly fee plus commission per held meeting |
| Leadium | Startups and mid-market SaaS that want a done-for-you SDR team | Email, phone and LinkedIn, deliverability setup, data sourcing | Contact form budget bands from $2,500 to $10,000+ |
| SalesHive | Teams that want a flat fee and a managed email program | Flat fee, no long-term contract, tied to its own sending tool | Flat monthly fee, amount not published |
| Abstrakt Marketing Group | Trade and service businesses that want a phone-led program with email | Dedicated team, exclusive territories, 100+ industries | Outbound programs from about $5,000 to $7,000 per month |
| OutreachBloom | B2B SaaS and services firms with 10 to 200 employees | Cold email plus LinkedIn, Reddit and AI search work | Separate pricing page, not reviewed |
| Hypergen | Growth-stage teams that want Clay-based targeting | Clay customization (per third-party listings) | Not confirmed |
Cold email lead generation is the core job of a cold email agency: it writes and sends outbound email to prospects who have not spoken to you before, then handles the replies and passes interested buyers to your sales team. Most also build the target list, register and warm up the sending domains and mailboxes, and report on replies and meetings. Many add LinkedIn outreach and cold calling to the same program.
Cold email agency models fall into three types. Some sell managed sending, where you pay a flat monthly fee for a volume band. Others sell a full outsourced SDR team that works email, phone and LinkedIn together. A third group, which includes QC Growth, embeds operators and a GTM engineer who build the outbound system, run it with you and hand it over.
The word "lead" covers different things across these vendors. Some report positive replies, some report booked appointments, and CIENCE reports held meetings. Ask which outcome the invoice is based on before you compare prices.
Early-stage founders hit a ceiling, and the cold email agency vs in-house question comes up the week they feel it. The first customers come from the founder's network, and that source dries up around the time the product has traction. Outbound has to replace it, and outbound email needs a working technical base before the first message goes out.
Deliverability is the part founders underestimate. Google's bulk sender rules, which took effect on February 1, 2024, require SPF, DKIM and DMARC authentication, one-click unsubscribe for marketing mail, and a reported spam rate below 0.30%, with a guideline to stay under 0.10% (Google Workspace Admin Help). The rules apply to senders above 5,000 messages a day to Gmail accounts, and small senders still feel the same filters. An agency that has set up many domains has seen those failure modes before you have.
Legal exposure sits there too. The FTC says each email that violates the CAN-SPAM Act can carry a penalty of up to $53,088, and that hiring another company to send on your behalf does not move your legal responsibility (FTC). Ask any agency how it handles opt-outs, which the FTC says must be honored within 10 business days.
Outsourced cold email costs less than building the function in-house, which is more than most seed budgets allow. By QC Growth's own math, a senior in-house GTM team costs $57k to $81k per month plus 1.25% to 2.75% in equity. An agency compresses that into a monthly fee, as long as you keep the data and messaging at the end.
The right type of agency depends on your stage, your buyer and how much of the motion you want to own. These are the five profiles we see most often.
You closed the first deals yourself and have a product with clear signal. You cannot afford a senior sales team, and cold outreach takes half your week.
An embedded pod such as full-service GTM from QC Growth fits this profile. It builds the outbound system, runs it with you, and leaves the infrastructure and data in your accounts.
Developers delete templated email on sight. These teams need copy that respects the reader and targeting based on real signals, such as hiring, tech stack and repository activity.
A cold email agency that sends the same sequence to a purchased list will hurt your brand with this audience. The dev tools GTM approach pairs operators who sold to developers with signal-based account selection.
Enterprise buyers hear from a dozen AI vendors a week, and cycles run longer than most seed teams expect. Cold email has to reach buyers who have budget and a trigger event.
Volume pricing rewards sending more, which works against you when the real market is a few hundred accounts. See how enterprise AI GTM is handled for this profile.
Provider and payer buyers respond to credibility and referrals. A bulk sender that burns a hospital system's inboxes can close doors that took you a year to open.
HealthTech GTM work needs operators with healthcare sales experience and a careful approach to compliance and list quality.
Companies past Series A with a documented message and a large addressable list can put a flat-fee email agency to work quickly. The pitch is already tested, so the agency's job is sending volume and reply handling.
Outbound System, Cleverly and SalesHive suit this profile, since all three describe managed programs that launch in a few weeks.
We reviewed each company's own site for services, channels, pricing and contract terms. Claims below are the companies' own unless stated otherwise. We rank QC Growth first because it is our company, and we say plainly where it is the wrong choice. Two sites could not be fully reviewed, and those sections say so.
QC Growth is an embedded go-to-market team for Seed to Series A B2B software companies. It places a fractional pod inside the client's environment: a top-tier GTM operator, a GTM lead, a GTM engineer and BDR support. The pod handles strategy, outbound infrastructure, messaging, campaigns and reporting.
QC is not a cold email shop. Cold email is one channel in its "Allbound" system, where inbound, outbound and partner channels share signals. Its core verticals are developer tools, AI, healthtech and deep tech.
The pod works inside your tools and runs the motion day to day. When the engagement ends, the infrastructure, data and playbooks belong to you. Targeting uses signal stacking, which combines firmographics, LinkedIn activity, job changes, hiring, tech stack and web visits, and a living ICP and messaging context is wired into Clay prompts and scoring. Outreach goes to accounts with a reason to talk, which protects your domain reputation and a small addressable market.
The operators have sold in the buyer's own vertical, with experience at Gatsby, Netlify, Workpop, MightyAI, Uber, OctoAI, NVIDIA, Tyk and SmartBear. Grafbase CEO Fredrik Bjork said QC "helped us land our first enterprise customers and find product-market fit." Eraser.io CEO Shin Kim said QC "built a repeatable outbound process that helped us land our first enterprise customers." The portfolio spans 50+ companies, mostly Seed to Series A.
Packages run $7.5k to $25k per month depending on scope, on 6 to 12 month engagements. That compares with the $57k to $81k per month plus equity that QC estimates for an in-house team.
QC Growth is the strongest fit when the real gap is a missing outbound system and cold email is one part of it. It suits founders who want the motion built and plan to own it afterward. If you want email sends and nothing else on a low flat fee, the next two agencies are a closer match.
Outbound System is a done-for-you cold email agency. Its page lists copywriting, list building, inbox setup and deliverability management, along with AI cold calling and LinkedIn outreach, run as one multi-channel program.
It describes itself as serving B2B companies without a single vertical, with case studies in financial services, M&A and investment banking, marketing agencies, SaaS, AI software, manufacturing and medical practices.
Outbound System is one of the few agencies here that puts plan prices on the page. Three flat monthly plans cost $1,499 for up to 15,000 emails, $2,499 for up to 30,000 and $3,999 for up to 60,000. The terms are month to month with no minimums, and cancellation takes 10 business days' notice.
It claims 1,000+ B2B clients, 52M+ cold emails sent, $26M in revenue closed from its leads and campaigns live in about 14 days. Its page gives inbox placement as both 98%+ and 99%, so treat that figure as marketing until you see a report.
Flat monthly plans of $1,499, $2,499 and $3,999 based on monthly email volume. Add-ons for extra sends and validation credits are available at a discount.
Outbound System is a sound pick for startups that want predictable billing and a managed email program. Founders selling to a few hundred accounts will get little from a volume-based plan.
Cleverly runs LinkedIn, cold email and cold calling programs for B2B companies. Its services also include appointment setting, outsourced SDRs and outbound strategy consulting.
The page describes a four-step process: strategy questionnaire, system setup, targeting and copy, and meeting notifications. It lists U.S.-based account managers, weekly reporting and monthly strategy calls.
Cleverly is one of the stronger choices for combining LinkedIn with cold email under one team. Its page reports 1,000+ active clients, $312M in pipeline generated and 100+ case studies. Sample results include 41 meetings in 3 months for a SaaS company and 307 meetings in 3 months for an insurance firm.
The footer shows different totals (100,000+ leads and 5,000+ clients) from the headline stats, so ask which numbers are current. The FAQ says most clients see positive replies within 2 to 4 weeks and states this is not a guarantee.
Not published on the page we reviewed. The call to action is a free consultation or strategy call.
Cleverly fits founders who want email and LinkedIn run for them with regular reporting. Ask for current pricing and terms before shortlisting, since neither appeared on the site.
Belkins is a B2B lead generation and appointment setting agency founded in 2017. Its services include cold email, cold and intent calling, voicemail, SMS, LinkedIn, paid ads, outsourced SDRs, deliverability consulting and HubSpot CRM consulting.
It says it works with B2B companies across 50+ industries and has generated $2B+ in client revenue.
Belkins is one of the strongest choices for breadth. Its deliverability work covers domain infrastructure, mailbox warm-up and sender score monitoring. It lists a 4.9 Clutch score from 230 reviews and a 4.8 G2 score from 93 reviews.
The page's meta description says the approach "guarantees 100-400 yearly appointments," while the body text says it delivers 100 to 400+ qualified appointments in a year and notes that results depend on many factors. Sample outcomes include 330 booked appointments in 15 months for one client and 145 appointments in 9 months for another.
Quote only. The company says its service costs about a fourth of the in-house equivalent, which is a self-reported figure.
Belkins suits companies that want a large, multi-channel vendor to run outbound. Founders who want to learn and own the system will find that the work stays inside the agency.
CIENCE books qualified sales meetings for B2B teams. One SDR runs email, phone and LinkedIn together, and campaigns send from protected domains with replies handled by the team.
It says it has served 2,500+ clients over 10+ years and published 115+ case studies.
CIENCE is one of the smartest choices for flexibility. A fixed monthly fee covers the team and a commission applies per held meeting, month to month, with no long-term contract. The meeting target is adjusted with the client each month.
It claims 5 to 20+ qualified meetings per SDR per month depending on industry and target, with campaigns live in about 14 days. Its SendBird case study cites 35,000 emails with a 50% open rate and 227 appointments in 4 months, from multichannel outbound.
Fixed monthly fee plus a commission per held meeting. The page links to a separate pricing page that we did not review.
CIENCE is a good pick for companies that want pay-for-performance terms and room to scale a team. Founders who need strategy and engineering around the email may find the scope narrow.
Leadium is a B2B lead generation and outbound appointment setting firm that provides a done-for-you SDR team. Services include outbound email, phone, LinkedIn, SMS, inbound lead qualification, data sourcing and deliverability setup.
It names cybersecurity, SaaS, freight logistics and e-learning among its industries, and it lists CEOs, founders and CROs among its buyers.
Leadium is one of the more startup-friendly options on budget. Its contact form lists bands from $2,500 to $3,500 up to above $10,000, a lower entry point than most full SDR agencies here. Its data work notes each contact's likely response channel, which helps decide who gets email and who gets a call.
It claims a 67% reduction in weighted cost against building in-house and a 73% increase in conversations from channel-matched data. The page gives 97 clients in the header and 76 in the results section, and two different funding totals, so treat the numbers with care.
No prices on the page. The contact form lists budget bands from $2,500 to $3,500 up to over $10,000.
Leadium fits small teams that want an outsourced SDR function on a modest budget. Confirm the billing basis in writing, since the bands are not labeled.
SalesHive is a B2B sales agency that runs managed cold email and cold calling through dedicated SDR teams. Its email campaigns run on its own AI sending tool, which handles personalization, tracking and follow-ups.
The page states that managed outreach requires that tool. CRM sync is available with Salesforce, HubSpot, Pipedrive, Zoho CRM and VanillaSoft.
SalesHive is one of the more transparent choices on terms. One flat monthly fee covers the SDR team, a strategist, the tool, data and software. There are no setup fees and no long-term contracts, billing starts after you approve the strategy, and the service runs month to month after launch.
Most clients launch about three weeks after kickoff. Case studies include 1,440 meetings over four years for a workplace injury management provider. The page says it does not guarantee a fixed number of meetings.
One flat monthly fee, with the amount shared after a conversation.
SalesHive suits teams that want predictable billing and a managed program. Founders who need signal-based targeting and ownership of their stack should look at embedded options.
Abstrakt Marketing Group is a St. Louis agency whose services span appointment setting, digital marketing and creative work. Appointment setting covers cold calling, cold email, lead qualification, LinkedIn outreach and outsourced SDR teams.
The page treats email as one channel in an omni-channel process with calls and direct mail, and gives few specifics on volumes or deliverability.
Abstrakt is one of the few agencies here that publishes starting prices for outbound, at around $5,000 to $7,000 per month. Every package includes exclusive territories, a dedicated team and monthly performance reviews.
It claims 2,000+ active clients, 100,000+ appointments per year, over $1B in revenue generated and a 3x ROI. Those are the company's own figures and the page does not explain how they are counted.
Outbound programs start around $5,000 to $7,000 per month, per its own page.
Abstrakt fits phone-led programs for trade and service companies. Software founders who want email-first outbound will find a closer fit elsewhere on this list.
OutreachBloom is a marketing agency based in Olympia, Washington. It lists four done-for-you channels: Reddit marketing, AI search work, cold email and LinkedIn outreach.
Its cold email service covers list building, sending infrastructure, AI-personalized messages that the client approves, and reply management.
OutreachBloom is one of the more unusual picks because it pairs outbound with Reddit and AI search visibility. It says it has served 1,000+ B2B brands and run 1,000+ campaigns since 2010, and that cold email is typically live within weeks.
The page mentions a 90-day engagement and says it is not a fit for consumer brands or deals too small to support a sales conversation. Full pricing sits on a separate page that we did not review.
Not stated on the page reviewed, which refers to a separate pricing page.
OutreachBloom suits SaaS teams that want email plus content channels from one vendor. Confirm the 90-day terms and pricing before you shortlist it.
Hypergen appears on several third-party lists of cold email agencies. One list describes it as a fit for growth-stage companies and says it uses deep Clay customization to track buying signals.
Hypergen's own site returned a certificate error when we tried to fetch it, so we did not review its services, terms or stats. Everything here is limited to what the third-party listings say.
Hypergen is one of the closest approaches to ours by method, since both lean on Clay and buying signals. That is a useful comparison point for founders who care about how targeting is built.
Because we could not verify its current services, ask directly how it handles data ownership, domain setup and reporting.
Not confirmed. We did not find published prices.
Hypergen is worth a call if Clay-based targeting is your priority. Verify services, terms and client results directly before you decide.
Use these five checks to narrow the list. Each one maps to a question you can put on a vendor call.
Ask which domains the emails send from, how many mailboxes it runs per domain and how it monitors spam complaints. Google asks bulk senders to keep the reported spam rate below 0.30%, so an agency should be able to show you that number for your campaigns. A vendor that cannot explain its setup in two minutes has probably not built it carefully.
Ask who owns the domains and mailboxes. If the agency owns them, your sending reputation leaves with the contract.
Replies, positive replies, booked meetings and held meetings are four different numbers. CIENCE reports held meetings, SalesHive's case studies count booked meetings, and Cleverly's page leads with positive replies. A booked meeting that never happens still costs your rep an hour.
Write the definition into the contract. Include who qualifies the prospect, which titles count and what happens to no-shows.
Some vendors keep the lists, sequences and playbooks. Others, like QC Growth, hand them over at the end. Ask what you keep if you stop paying and whether you can export contacts, sequences and reporting.
This decides whether the next year costs you another full ramp-up. It also decides whether your learnings about messaging stay with your team.
Cold email agency pricing comes in three shapes: flat send-volume plans, retainers and commissions per meeting. Add setup fees, minimum terms and any tool you must buy. Outbound System bills by send volume, CIENCE adds a commission, and SalesHive requires its own tool. Compare the total with the $57k to $81k per month plus equity that QC Growth cites for a senior in-house GTM team.
For month-to-month vendors, factor in the cost of switching if results lag. Low monthly fees look cheaper than a 6 to 12 month engagement until you add a second ramp-up.
Volume plans reward long lists. If your market is a few hundred real accounts, send quality matters more than send count, and a burned list is hard to rebuild. Ask the vendor for results at your stage and with buyers like yours, not averages across 50 industries.
Request one reference call from a company at your size. A vendor that has only worked with large lists will run a different playbook from one that has taken Seed teams to their first enterprise customers.
| Category | Key Considerations |
|---|---|
| Top 3 for early-stage software | QC Growth, Outbound System, Cleverly |
| Who Is It For | Founders and sales leaders who need outbound email running and cannot staff it in-house |
| Use Cases | First enterprise deals, testing a new segment, filling a thin pipeline, replacing an expiring founder network |
| How to Choose | Check domain protection, define a result, confirm data ownership, compare total cost, match volume to market |
| Mistakes to Avoid | Paying for sends with no deliverability reporting, letting the agency own your domains, signing without export rights |
| Pricing Starts | $1,499 per month on Outbound System's lowest plan, with QC Growth packages at $7.5k to $25k per month |
QC Growth builds and runs the outbound system for Seed to Series A technical founders, and you keep the infrastructure, data and playbooks when we finish. The pod includes a GTM operator, a GTM lead, a GTM engineer and BDR support, at $7.5k to $25k per month compared with $57k to $81k per month plus equity for an in-house team.
Read how it worked for Burn Media Co., where revenue went from $142k in April to $181k in August, a 27.5% increase. You can also see client quotes from Grafbase, Eraser.io and Crescendo on our case studies page. Founders who want to talk through fit can book a strategy call with Luke Bivens' team.
The best cold email agency for B2B startups in 2027 is QC Growth for Seed to Series A software teams that want cold email inside an outbound system they keep. Outbound System is the more direct fit for flat-fee email sends, with plans from $1,499 to $3,999 per month. CIENCE reports held meetings on a month-to-month basis. QC is a stretch if you want email sends alone.
Consider how the agency protects your domain, what it counts as a result, who owns the data and sequences, total cost and proof at your stage. Google asks bulk senders to keep the reported spam rate below 0.30%, so ask to see that figure for your campaigns. CIENCE reports held meetings while SalesHive's case studies count booked meetings, so the same number can mean different things. Ask for one reference call from a company at your size.
QC Growth differs from other cold email agencies by embedding a pod of an operator, a GTM lead, a GTM engineer and BDR support, and leaving the infrastructure, data and playbooks with you. Most agencies keep the sequences and sell sends or meetings by the month. QC uses signal stacking across firmographics, LinkedIn activity, job changes, hiring, tech stack and web visits. It does not guarantee meeting counts.
Getting started with QC Growth begins with a strategy call booked through qcgrowth.com/contact-us. The team reviews your stage, buyer and current pipeline, then recommends either the GTM Systems and Ops package or the Full Service GTM package. Engagements run 6 to 12 months at $7.5k to $25k per month.
Switching to QC Growth is straightforward because the pod works inside your existing tools and CRM and does not require you to rebuild your stack first. Because the infrastructure and data are yours, you can also leave without losing the work. Month-to-month agencies such as CIENCE and Outbound System are easier to leave, but the sequences and domains usually stay with them.
You can run cold email yourself if you can set up SPF, DKIM and DMARC, keep the spam rate under 0.30%, build clean lists and answer replies daily. Google's bulk sender rules and the FTC's CAN-SPAM requirements apply to you either way, and the FTC says hiring a vendor does not transfer your legal responsibility. In-house, a senior GTM team costs $57k to $81k per month plus equity by QC Growth's math. Founders who cannot spare the hours each week usually hire help.
A cold email agency costs from $1,499 per month on Outbound System's lowest published plan to $5,000 to $7,000 per month at Abstrakt, and $7.5k to $25k per month at QC Growth for an embedded pod. Leadium's contact form lists bands from $2,500 to above $10,000. CIENCE charges a fixed monthly fee plus a commission per held meeting. Several agencies, including Belkins, publish no prices and quote after a call.