Best cold email agencies

The 10 agencies at a glance

5. How much public review evidence is there? Not testimonials on their own site, which anyone can curate, but reviews on a directory a buyer can search. Belkins carries 230+ at 4.9 and SalesRoads 65 at 4.9. Grow Surely has three. Volume of public review evidence is the one thing a newer agency cannot shortcut, and it is a fair thing to weigh.

Four of the ten publish nothing about price, which is normal in this category and worth knowing before you book ten discovery calls.

The five standards we judged everyone on

Most agency comparisons rank on vibes and call it research. These are the five things we checked on every agency here, including ourselves, and they are the five we would tell you to check if we were not on the list.

1. Do they publish named clients with real revenue numbers? Not a star rating, not "a leading SaaS company." A client you could look up and a number you could ask them about. This is the standard almost nobody clears, and it is the one worth weighting heaviest, because it is the only claim on an agency website that is checkable from the outside.

2. Can you see the price before a sales call? Three of the ten publish a price, including Grow Surely. Seven do not. Neither does it make them bad, but it tells you how long the buying process will take.

3. Is there a way to see the work before you pay for it? Everyone will show you a case study. The question is whether anything produces meetings for you before money changes hands.

4. Is cold email the product, or one channel inside a bigger service? Both models work. Buying the wrong one means funding calling and LinkedIn effort that your buyers were never going to respond to.

Based on what each agency publishes openly as of October 2026. "Not advertised" means we could not find it stated publicly, not that it does not exist - several of these will run a trial if you ask, and asking is free.

Grow Surely clears the first four and is plainly the newcomer on the fifth: three Clutch reviews against Belkins at 230+ and SalesRoads at 65. Sixteen named case studies and a long directory profile are different kinds of evidence, and on review volume Grow Surely is behind. That is also most of the reason the first 7 days are free: an agency without 230 reviews behind it has to prove the work instead of pointing at a number, and a pilot is the only honest way to do that.

1. Grow Surely

Best for: B2B teams above $1M ARR who want to see the work produce meetings before any money changes hands.

Every other agency on this list asks you to sign a contract before you see anything work. Grow Surely runs the first 7 days free, books 3 to 5 qualified meetings against criteria you set, and only then talks about a contract. If the pilot does not produce, the buyer has lost a week and nothing else.

The model is cold email and appointment setting only. Grow Surely does not sell LinkedIn outreach or paid media as separate services, on the view that running one channel properly beats running four badly.

Ashley Flitter VP of Operations, Br8kthru

"After vetting dozens of outbound partners and trying our hand at bringing it in-house, we chose Grow Surely for their attentive team and transparency. They gave us realistic timelines, executed on time, and our results have been far better than what we were doing on our own."

Pros. The proof is specific and public rather than aggregated into a testimonial wall. Courimo, an SEO agency, was broken into the US market for $100,000+ in revenue and 33 meetings in 2 months. batch, a post-Series B marketplace, closed $200,000+ and 134 meetings in 3 months from a 3-vertical engine. Bound Marketing saw $600,000+ in pipeline and 65+ leads in 4 months. Retention sits at 95% a month against a sector norm nearer 65%, and the team is certified on both Instantly and Clay, which are the two tools most of this list runs on.

Cons. Single channel by design. If you want cold calling, LinkedIn and paid media coordinated under one roof, Belkins, Martal or Understory are built for that and Grow Surely is not. The fit also starts around $1M ARR, because below that the economics of outbound rarely clear.

Verdict. Pick Grow Surely if you want the work to prove itself before money changes hands. Look elsewhere if you need cold calling and LinkedIn coordinated under one roof.

Ask them this. Ask for the pilot to run on a segment you pick, not one they pick. A pilot run on the easiest slice of your market converts beautifully and tells you nothing about the rest of it.

2. Belkins

Best for: Teams who want the most-reviewed, lowest-variance option in the category.

Belkins is the default safe pick, and it earns that. No other agency in this category has anywhere near the volume of public review evidence, which matters when you are spending someone else's budget and need the decision to be defensible.

Pros. The review base is the moat. 230+ Clutch reviews at 4.9 is more public accountability than anyone else here carries, and 800+ clients means they have almost certainly run your ICP before. They report testing 50,000+ email variations, so the copy library is deep.

Cons. The motion is bundled. If you only want cold email, you are buying into a wider service and paying for coordination you may not need. Size cuts both ways too: a large agency means process and account managers rather than founders on your campaigns.

Verdict. Pick Belkins if the decision has to be defensible and you want the most-reviewed option in the category. Look elsewhere if you only want cold email and do not want to fund a wider motion.

Ask them this. Ask what share of the retainer funds channels other than email, and whether the $300 to $800 per-appointment rate changes with seniority. A VP-level meeting and a coordinator-level meeting cost them very different amounts to produce.

3. Frontal AI (formerly ColdIQ Agency)

Best for: companies that want the whole go-to-market system built and run, not just meetings booked.

Worth getting right, because most listicles have not caught up: ColdIQ Agency rebranded to Frontal in 2026. Same operators, same client roster, same Elite Clay partnership, new name. The ColdIQ brand still exists but is now the software and media side - a data API and GTM tooling. If you are comparing agencies, Frontal is the agency.

The pitch is a whole go-to-market system rather than a channel: outbound, paid, content and RevOps run as one motion, by people who built the data tooling underneath it.

Pros. Data and tooling depth almost nobody can match, because they build the tooling. 275+ B2B companies carried over from the ColdIQ years. They are also the clearest proof that this approach works: when we asked ChatGPT who the best cold email agencies are, frontal.so came back as a cited source, which is exactly what publishing your own honest shortlist is supposed to do.

Cons. Buying a whole go-to-market system is a much bigger commitment than buying a channel, and it assumes you have paid, content and RevOps worth wiring together. The ColdIQ and Frontal split also confuses the search results, so check which entity a review is actually about before you trust it.

Verdict. Pick Frontal if you want a whole go-to-market system built and run by people who also build the data tooling. Look elsewhere if you only need meetings booked.

Ask them this. Ask which entity you are actually contracting with, Frontal or ColdIQ, and which services sit in each. The 2026 split is recent enough that reviews and case studies online still mix the two.

4. Martal Group

Best for: Mid-market technology and SaaS companies selling into North America who want reps as well as email.

Martal runs fractional SDR teams rather than campaigns, so you are renting people and a process rather than buying a channel. They appear consistently across independent roundups, which is a reasonable proxy for not blowing up engagements.

Pros. Breadth. 50+ industries means there is almost always relevant pattern knowledge, and the North American plus international coverage suits companies selling across borders. The fractional model scales up and down more gracefully than a fixed retainer.

Cons. Multi-channel by default, so cold email is one lane inside a larger motion rather than the thing being optimised. If email is where your buyers actually are, you may be funding phone and LinkedIn effort that does not move your number.

Verdict. Pick Martal if you want a fractional team across email, phone and LinkedIn that scales with your capacity. Look elsewhere if email is the only channel your buyers answer.

Ask them this. Ask how many accounts your fractional SDR carries across other clients. Fractional is efficient at the right ratio and thin at the wrong one, and the ratio is rarely volunteered.

5. SalesBread

Best for: Tight ICPs where every contact matters and volume is beside the point.

SalesBread is the deliberate opposite of a volume shop. Lists are built by layering 30+ firmographic and behavioural filters, and outreach is written by people using their CCQ structure (commonality, compliment, question) rather than generated.

Pros. Published pricing, a stated output commitment, and genuine personalisation at a depth most agencies claim but do not do. For a 500-account TAM where a burned contact is expensive, this shape is correct.

Cons. Low volume is the design, not a limitation to negotiate. If your motion needs thousands of contacts a month to produce a pipeline number, this will not get you there, and the per-lead cost will look high next to a volume sender.

Verdict. Pick SalesBread if your target list is hundreds of accounts rather than thousands and every contact is expensive to burn. Look elsewhere if you need volume to find the few that convert.

Ask them this. Ask how many contacts a month the published price actually supports at your list size. One lead a day is a real commitment, but it implies a volume ceiling worth knowing before you sign.

6. CIENCE Technologies

Best for: Enterprise teams running complex, data-heavy outbound with real reporting requirements.

CIENCE is built for organisations where outbound has to survive a quarterly business review. The reporting layer and the proprietary data stack are the product as much as the SDRs are.

Pros. Depth of data and the reporting apparatus. For multi-segment enterprise programmes where someone has to explain performance to a board, this is the most instrumented option here.

Cons. Their Clutch rating sits at 4.2, the lowest of the agencies on this list, and the enterprise process overhead is real. A 20-person company will find the engagement heavier than the problem warrants.

Verdict. Pick CIENCE if outbound performance has to survive a board review. Look elsewhere if you are under about fifty people and the process overhead would outweigh the reporting.

Ask them this. Ask what the 4.2 Clutch rating is driven by, then read the three-star reviews rather than the five-star ones. A mid rating on a large review base is more informative than a perfect one on a small base.

7. SalesRoads

Best for: Companies that want fully onshore US reps and a phone-first motion.

SalesRoads deploys US-based SDR teams for buyers who specifically do not want offshore calling. Their reputation rests on training and consistency rather than tooling.

Pros. Fully onshore delivery and a strong training reputation, which shows up in complex B2B conversations where a rep has to think rather than read. The 4.9 rating across 65 reviews is solid, independent evidence.

Cons. Phone-first. Cold email exists to support the calling motion, so if email is the channel you actually want optimised, you are buying the wrong strength. Onshore reps also carry onshore cost.

Verdict. Pick SalesRoads if you want fully onshore US reps and your buyers respond to the phone. Look elsewhere if email is the channel you actually want optimised.

Ask them this. Ask what share of the motion is phone versus email. If the honest answer is mostly phone and your buyers do not answer phones, you are buying their strongest capability and your weakest channel.

8. Understory Agency

Best for: Funded Series A to C SaaS companies wiring outbound into the rest of go-to-market.

Understory holds Enterprise Clay Partner status, builds its own sending infrastructure rather than renting it, and times campaigns off buying signals. The argument underneath all of it is that outbound should stop operating as a separate department and start feeding the rest of go-to-market.

Pros. The integration thesis is genuinely differentiated. Most agencies hand you meetings and leave the rest of the funnel to you. Campaigns typically go live in 3 to 4 weeks, which is honest about warmup rather than promising week-one results.

Cons. The model assumes funded SaaS with a GTM team to integrate into. Bootstrapped companies, or anyone selling into non-tech verticals like cleaning, manufacturing or construction, will be paying for connective tissue they do not have.

Verdict. Pick Understory if you are funded, selling software, and want outbound wired into paid, content and RevOps. Look elsewhere if you are bootstrapped or selling into non-tech verticals.

Ask them this. Ask what they need from your side. The model assumes someone in your business owns revenue operations and can wire outbound into paid and content. If that person does not exist, you are buying the expensive half of the value.

9. OutreachBloom

Best for: Teams who want a known price and a fixed scope with no procurement dance.

OutreachBloom publishes its price, which in this category is close to a differentiator on its own. Reply management is included rather than sold as an upgrade.

Pros. Price transparency and a clear scope. You know what you are paying before a sales call, and reply handling being in the base price removes the most common hidden cost in cold email engagements.

Cons. Fixed scope means limited customisation. If your ICP needs an unusual data build or your sales cycle needs something off-template, a bespoke engagement will fit better than a productised one.

Verdict. Pick OutreachBloom if you want a known price and a fixed scope with no procurement cycle. Look elsewhere if your ICP needs an unusual data build.

Ask them this. Ask what falls outside the fixed scope, and what it costs when it does. Published pricing is only an advantage if the published price is what you end up paying.

10. Callbox

Best for: Enterprise account-based programmes and long, multi-stakeholder sales cycles.

Callbox has been running B2B outbound since 2004, which in a category where most agencies are under five years old is unusual on its own. The strength is enterprise account-based work rather than volume email.

Pros. Longevity and enterprise ABM depth. For a programme targeting a few hundred named accounts with multiple stakeholders each, the multi-touch approach fits the shape of the problem.

Cons. Enterprise-oriented process and pace. For an SMB that needs meetings this quarter, the engagement is slower and more structured than the situation calls for.

Verdict. Pick Callbox if you are running enterprise account-based work across a few hundred named accounts. Look elsewhere if you need meetings this quarter.

Ask them this. Ask for a realistic timeline to first meeting on an account list the size of yours. Enterprise ABM is slower by design, and the number should be months rather than weeks.

How to actually choose between them

Most comparison posts end with "it depends on your needs," which helps nobody. Four questions separate these agencies in practice.

Is cold email the channel, or one of several? Grow Surely, SalesBread and OutreachBloom run email as the product. Belkins, Martal, SalesRoads and Callbox fold it into a wider motion with calling and LinkedIn. Buying a multi-channel agency when your buyers only respond to email means funding effort that cannot move your number.

How much proof do you need before committing? This is the question that separates a free pilot from a 6-month contract. Ask every agency on your shortlist what happens if month one produces nothing, and listen for whether the answer involves your money.

Does your targeting depend on signals or firmographics? If you need to catch companies at the moment they hire, raise or switch tools, ColdIQ and Understory have built for that specifically. If a good static list of the right titles at the right company sizes is enough, you do not need to pay for signal infrastructure.

Who owns deliverability? The single most common failure in cold email is domains burning quietly while the dashboard still shows sends. Ask directly who monitors domain health, how often, and what happens when reply rates fall. We wrote up the mechanics in .

What a cold email agency costs

Most engagements in this category land between $2,000 and $10,000 a month. Four publish a number. SalesBread sits at $2,000 to $3,000 and OutreachBloom at $2,400, both at the bottom of that band. Belkins is reported at $3,000 to $15,000+ without publishing it. Grow Surely runs $5,000 to $15,000+ a month after a free 7-day pilot. The rest quote per engagement.

The number that matters is not the retainer, though. It is cost per qualified meeting, and that only becomes visible after a month or two of real sending. A $2,400 retainer producing four meetings is more expensive than a $6,000 retainer producing twenty.

Worth comparing against the in-house alternative before you decide either way: one SDR salary plus the sending and data stack usually clears $8,000 a month fully loaded, before anyone has written a sequence. We break the full comparison down in .

If you sell into B2B SaaS specifically, the vertical shapes the answer more than the agency does, and we cover that in lead generation for SaaS companies.

Seven questions to ask on every discovery call

Agencies are good at discovery calls. These are the questions that produce different answers from different agencies rather than the same reassurance from all of them.

1. Whose domains am I sending from, and when were they registered? You want fresh domains bought for you and warmed, not a shared pool carrying someone else's reply history. If the answer is vague, that is the answer.

2. How long until the first email goes out? Two to four weeks is normal, because new sending domains need that long to warm. The exception is an agency already running warmed infrastructure: Grow Surely launches pilot campaigns in a day for exactly that reason. An agency promising week-one sends from brand new domains is skipping warmup, which burns the domains.

3. Who writes the copy, and can I see three examples from accounts like mine? Not a case study. The actual emails. Vagueness here usually means a template library with the company name swapped.

4. What is your definition of a qualified meeting? This is where guarantees get decided. Ask whether a no-show counts, whether a prospect who was never in your ICP counts, and who adjudicates.

5. What happens in month one if nothing lands? Listen for whether the answer involves your money or only their effort.

6. Who monitors deliverability, and how often? The correct answer names a person and a cadence. "Our system handles it" means nobody is watching.

7. How many other clients are you running in my category right now? Two agencies pitching the same 4,000 prospects on your behalf is a real risk in narrow verticals, and few people think to ask.

Four things that should end the conversation

A meeting guarantee with no definition attached. Guaranteed numbers are easy to hit when the definition of a meeting is loose enough. The guarantee is only worth what the definition is.

Volume quoted as the deliverable. "We will send 50,000 emails a month" describes effort, not outcome. The number that matters is qualified conversations, and an agency leading with send volume is telling you which one it is being measured on.

No named clients anywhere. Anonymous case studies ("a leading SaaS company") are the standard way to describe work that either did not happen or did not go well. Named clients with named people are checkable, and checkable is the whole point.

A long contract with no exit. Six or twelve months locked is common in this category and it exists to protect the agency from its own first two months. If the model works, a short commitment costs the agency nothing.

When you should not hire any of these agencies

Three situations where outbound is the wrong spend, said plainly because agencies rarely say it.

You cannot name the companies you want. If the ICP is "B2B companies that need our product," no agency can build a list that works. The targeting problem is upstream of the sending problem, and paying someone to send into a vague list produces vague results expensively.

Nobody can take a meeting next week. Cold email creates a timing problem: a prospect who replies on Tuesday is interested on Tuesday. If your calendar is three weeks out or your founder is the only person who can run the call, most of what gets booked will decay before it converts.

Your average deal is under about $3,000. The economics stop working. At $2,000 to $10,000 a month plus ramp time, you need deal sizes and retention that can absorb the cost before the channel compounds. Below that, inbound and partnerships usually return more per dollar.

Grow Surely turns down work for the first and third reasons regularly, which is less noble than it sounds: a pilot that cannot work is bad for both sides.

The three pricing models, and what each one really costs you

Every agency on this list uses one of three models. They look like pricing differences. They are actually risk differences, and knowing which risk you are buying matters more than the headline number.

The retainer. You pay a fixed monthly fee for effort: list building, copy, sending, reply handling. SalesBread publishes $2,000 to $3,000 and OutreachBloom $2,400; Belkins is reported at $3,000 to $15,000+ without publishing it. The risk sits entirely with you. If the campaign does not work, you have paid in full for finding that out.

A retainer is the right buy when you already know outbound works in your market and you are buying execution. It is the wrong buy when you are still testing whether anyone replies at all.

Pay per appointment. Belkins offers this at $300 to $800 per meeting. Some risk moves to the agency, which sounds strictly better and is not, because the definition of "appointment" quietly becomes the entire contract.

An agency paid per meeting optimises for meetings. That is not cynicism, it is how incentives work. The predictable failure is a calendar full of technically-qualified people who were never going to buy. If you take this model, the definition of a qualified meeting has to be written down before anything is sent, and it has to include who decides.

The pilot. The agency produces results first and you pay afterwards. Ours is 7 days and free. The honest failure mode here is a pilot run on the single easiest segment in your market, which converts beautifully and then does not scale. The defence is simple: pick the segment yourself, and pick one you actually want more of.

The number that decides all of it is cost per qualified meeting, and it only becomes visible after a month or two of real sending. A $2,400 retainer producing four meetings costs $600 a meeting. A $6,000 retainer producing twenty costs $300. The cheaper agency was twice as expensive.

Ask every agency on your shortlist what their median client pays per qualified meeting. The ones who know will tell you. The ones who do not know have told you something too.

What month one, two and three actually look like

Most disappointment with cold email agencies is a timing problem rather than a quality problem. Here is the real shape of it, so you can tell a slow start from a failing one.

Month one is construction, and you should expect almost nothing. Domains get bought, inboxes created, and warmup begins: tiny send volumes that climb daily while mailbox providers decide you are a real sender. In parallel the list gets built and the copy written. Actual sending starts somewhere in week three or four, at a fraction of full volume.

A handful of meetings in month one is a good month one. Zero is not yet a problem. If an agency promised you fifteen from a standing start, ask when they bought the domains.

Month two is the first real data. Volume reaches full pace and reply rates become meaningful rather than noise. This is when a campaign gets adjusted: segments that are not replying get cut, angles that are working get expanded, and subject lines get tested properly. Expect the first consistent meetings here.

This is also where a good agency becomes distinguishable from a bad one, because a bad one keeps sending the same thing and calls it patience.

Month three is the month you judge. You now have enough volume to know your reply rate, your meeting rate, your show rate and your cost per qualified meeting. Those four numbers are the verdict.

The two mistakes sit either side of that. Judging at week six means killing campaigns before the data exists. Signing a six-month contract with no checkpoint means paying for four months after you already knew. The sensible structure is a contract that can end at month three, reviewed against numbers agreed up front.

Write down what a qualified meeting means, before anyone sends anything

This single document causes more disputes than pricing, copy and deliverability combined, and almost nobody writes it before signing.

Five things it needs to say.

Who has to attend. A named title or seniority, not "a decision maker." If your sale needs a VP and you get a coordinator, that is not your meeting.

Whether they knew what the call was about. A meeting booked by implying something other than a sales conversation will show up and go nowhere. The test is whether the prospect could describe the purpose of the call in advance.

Whether they were in your ICP. Company size, industry and geography, written as a filter rather than a description.

What happens with a no-show. This is the most common dispute in the category. Does a no-show count, does a reschedule count, how many reschedules before it is dead. Pay-per-appointment contracts live or die here.

Who decides. When you and the agency disagree about whether a meeting counted, there has to be a process that is not an argument. Usually that means you decide, and the agency can appeal with the recording.

An agency that resists writing this down is telling you how it intends to count.