TL;DR
Agencies buy different things from in-house teams. The four that decide the purchase are client isolation, user roles, sending account limits, and whether contacts pool across clients. Feature lists rarely mention any of them.
Smartlead and Instantly both make email accounts unlimited and meter volume instead, which is the right shape for agency work. Best for: agencies whose cost problem is mailbox count.
Reply.io and Woodpecker are the two with purpose-built agency commercial models, at a flat monthly fee and a per-active-client fee respectively. Best for: predictable per-client margin modelling.
Lemlist, Snov.io and Mailshake are all capable senders that price per seat, which makes them expensive for agency shapes. Best for: agencies with very few clients and very high volume each.
Contents
- What agencies actually buy
- The seven platforms
- Comparison table
- Client isolation and what "workspace" really means
- Sending accounts, pooled contacts and the shared warm-up question
- APIs and reply handling
- Modelling per-client margin
- Additional tools to consider
- FAQ: Cold Email Platforms for Agencies
What agencies actually buy
An in-house team buys sending capacity. An agency buys separation.
That difference explains why agency owners keep ending up on platforms that a features comparison would rank lower. The six requirements below decide the purchase, and only two of them appear on a typical pricing page.
Client isolation. Can each client's campaigns, mailboxes, contacts and reporting live in a container that another client's data cannot reach? Not "can I tag campaigns", which is what some platforms mean by workspace.
User roles. Can a junior operator run campaigns without seeing billing, and can a client see their own reporting without seeing anyone else's?
Sending accounts. Is mailbox count metered? An agency running eight clients with six mailboxes each needs 48 sending accounts before it sends anything. On a per-mailbox meter that is the entire business model.
Pooled contacts. If two clients both target the same account, does the platform treat that as a duplicate and suppress one? For an agency, suppression across clients is a bug, not a feature.
APIs. Can you provision a client programmatically, or is onboarding a manual afternoon per client?
Reply handling. Can replies be routed to the client, to your inbox, or to a shared queue, and can that differ per client?
This article is scoped to agency buying requirements. It is not a deliverability tools roundup and not a sending infrastructure guide; both are separate purchases that sit underneath whichever platform you choose. Prices were read from vendor pricing pages and vendor help documentation in early September 2026, and where sources disagree the range is given rather than a false single figure.
The seven platforms
1. Smartlead
Layer(s)/Best for: Volume-metered sender with published agency add-ons. Best for agencies whose cost driver is mailbox count.
Smartlead prices on send volume and verified lead allowance rather than per seat or per mailbox, and every plan includes unlimited email accounts. For agency work that is the single most important structural fact in this list.
The plans, as published: Base at $39 per month or $32.50 on annual billing, covering 2,000 contacts, 6,000 email sends per month and 2,000 verified prospect emails. Pro at $94 per month or $78.30 annual, covering 30,000 contacts, 90,000 sends and 30,000 verified emails. Unlimited Smart at $174 per month or $144.50 annual, with unlimited contacts, 150,000 sends and 50,000 verified emails. Unlimited Prime at $379 per month or $314.60 annual, with unlimited contacts, 500,000 sends and 170,000 verified emails. Annual billing saves 17 percent.
The agency mechanics are published, which is rare and useful. White labelling is an add-on at $29 per month per client workspace, letting you brand the platform and manage each client from a separate workspace. Client workspaces are available from the Pro plan upward, and Unlimited Prime includes three workspaces. Some sources also list a client workspace add-on at $39 per month, and dedicated servers at $39 per month. Email verification is a value-added add-on on all plans, purchasable one-time or monthly. A SmartDialer add-on starts from $9 per month in credits.
For Smartlead, include the agency’s client access, branding, active contacts and sending capacity. Domain and mailbox costs remain separate from the platform comparison.
Pricing: $39 to $379 per month, or $32.50 to $314.60 annual. Unlimited email accounts on every plan. White label $29 per month per client workspace. Client workspaces from Pro.
Where it falls short: reported IP blacklisting issues and slow support responses appear in current reviews, and the shared warm-up pool is a genuine consideration for an agency, since your clients' reputations are being warmed alongside strangers'.
Verdict: the strongest default for a multi-client agency, because the pricing shape matches the business shape and the add-on prices are public.
2. Instantly
Layer(s)/Best for: Volume-metered sender split across three separately priced products. Best for agencies that want unlimited mailboxes and will buy only the sending layer.
Instantly also makes sending accounts unlimited and meters volume, and it splits the platform into three products that are priced separately: Outreach, Lead Finder and CRM.
One thing to check before you buy, because it is currently a live inconsistency: the plan card and the comparison table directly beneath it state different email allowances for the Hypergrowth tier. Confirm your allowance in writing.
For agency purposes the important judgement is that you probably want Outreach only. Lead Finder is a database purchase, and most agencies either already have one or should buy a better one.
Where it falls short: the three-product split means the advertised entry price covers less than it appears to, and the shared warm-up pool carries the same reputational consideration as Smartlead's.
Verdict: closely matched with Smartlead on structure. Choose between them on client workspace mechanics rather than on headline price, because the price gap is smaller than the isolation gap.
3. Reply.io
Layer(s)/Best for: Flat-fee agency plan with unlimited clients. Best for agencies that want one predictable line item.
Reply.io is the only platform here with a flat agency price rather than a per-client one. The Agency plan is $166 per month, annual billing only with no monthly option, and includes unlimited clients, unlimited users, unlimited mailboxes, unlimited email warm-up, unlimited contact storage, white label, an agency dashboard, roles and permissions, dedicated support, a unified team workspace and 10,000 data search credits.
The catch is the same one that applies to Reply.io's other plans. Channels beyond email are add-ons: LinkedIn automation at $69 per month per LinkedIn account, calls and SMS at $29 per month per account. If your clients want LinkedIn, that cost is per account and it adds up fast across a client book.
Pricing: Agency $166 per month, annual only, unlimited clients and users. LinkedIn add-on $69 per month per account. Calls and SMS $29 per month per account.
Where it falls short: annual-only billing on the Agency plan removes flexibility exactly where agencies need it, since client books change monthly. Sales outreach plans also include only 50 live data credits per month.
Verdict: the cheapest per-client platform economics in this list, provided your clients are email-led and you can commit annually.
4. Woodpecker
Layer(s)/Best for: Usage-metered sender with a per-active-client agency panel. Best for agencies with many clients and modest volume each.
Pricing basis: Woodpecker. Use the contacted-prospect volume and selected modules in the current calculator. Check how follow-ups, additional mailboxes and client access affect that configuration.
The agency panel is $27 per month per active client. Because it is per active client rather than per workspace-plus-white-label, an agency that loses a client stops paying for it immediately, which is a better fit for real client churn than an annual commitment.
Where it falls short: the usage meter turns against you at high volume per client, and the product ships fewer growth features than newer competitors because its priority is deliverability.
Verdict: the most honest pricing model in the list and the most predictable at high client count with moderate volume. Check the arithmetic if any single client sends heavily.
5. Lemlist
Layer(s)/Best for: Per-seat multichannel sender. Best for very small agencies with high volume per client.
Pricing basis: Lemlist. Compare the selected email or multichannel plan with its connected-mailbox allowance, calling and data add-ons. Keep currency and billing term consistent.
Self-serve plans include five guest seats; Enterprise gives unlimited guest seats.
The reason it ranks fifth for agencies rather than higher is a compliance rule, not a feature gap. All connected sending addresses on a seat must belong to the same person, on a one account equals one person basis, and misuse can result in suspension or disconnection. Running multiple clients' mailboxes through one seat is exactly what that rule prohibits.
Where it falls short: the sending-address ownership rule makes genuine multi-client operation a risk, and LinkedIn steps run through a browser extension that requires the machine to be running and is more detectable than server-side alternatives.
Verdict: an excellent sender, a poor agency platform. Use it if you have one or two clients and want channels bundled; do not build a client book on it.
6. Snov.io
Layer(s)/Best for: Tiered sender with separately priced LinkedIn slots. Best for agencies that want a mid-priced tier ladder.
Snov.io publishes a tier ladder that includes Pro M at $189 per month and Pro L at $369 per month, with a top Ultra tier that the vendor's own page describes inconsistently: the plan card reads custom with a contact-sales button while the plan-comparison row on the same page prices it at $738 per month. Treat Ultra as quoted rather than listed and ask which figure applies.
Two costs sit outside the plan price and matter for agency work: LinkedIn account slots are billed separately at $69 per month per slot, and managed mailboxes are $5 per month per email account. That second one is the important one here, because it means mailbox count is metered, unlike Smartlead, Instantly, Reply.io Agency and Woodpecker.
Pricing: Pro M $189 per month, Pro L $369 per month, Ultra quoted or listed at $738 depending on where you look. LinkedIn slots $69 per month each. Managed mailboxes $5 per month each.
Where it falls short: per-mailbox charging is structurally wrong for agency shapes, and a pricing page that contradicts itself on its top tier is a reason to get any quote in writing.
Verdict: workable for a small agency with few mailboxes per client. The $5 per mailbox line eliminates it for anyone running dozens.
7. Mailshake
Layer(s)/Best for: Per-seat multichannel outreach with a separate dialer. Best for agencies with very few operators.
Mailshake charges $99 per seat per month on its Sales Engagement plan, covering multi-channel outreach across email, phone and social steps.
For agency purposes the per-seat model is the problem. Scaled to a five-person team the gap against a usage-metered platform runs to thousands of dollars a year before a dialer add-on enters the picture, and the credit-based data finder is a further metered cost.
It is included in this list because it is a mature, reliable product with a genuine multichannel sequence engine, and because for a two-person agency that sends very high volume per client, a flat per-seat price can be the cheapest option available. That is a narrow window, and it is worth checking whether you are in it.
Pricing: $99 per seat per month on the Sales Engagement plan. Dialer sold as an add-on. Data Finder metered by credits.
Where it falls short: per-seat pricing, a separately priced dialer, and a metered data finder together make it the least agency-shaped commercial model in the list.
Verdict: last on this list for agencies specifically, and that is a comment on the pricing model rather than on the product.
Comparison table
| Tool | Layer | Best for | Entry price |
|---|---|---|---|
| Smartlead | Volume-metered, unlimited mailboxes | Multi-client agencies | $32.50 per month annual, plus $29 per white-labelled workspace |
| Instantly | Volume-metered, three separate products | Sending layer only | Current scoped quote; confirm term and included capacity |
| Reply.io | Flat agency plan | Lowest per-client platform cost | $166 per month, annual only |
| Woodpecker | Usage-metered, per-active-client panel | Many clients, modest volume | Current scoped quote; confirm term and included capacity |
| Lemlist | Per-seat multichannel | One or two clients, bundled channels | Current scoped quote; confirm term and included capacity |
| Snov.io | Tiered, per-mailbox charges | Few mailboxes per client | $189 per month, plus $5 per mailbox |
| Mailshake | Per-seat multichannel | Very few operators, high volume | $99 per seat per month |
Client isolation and what "workspace" really means
The word workspace is doing at least three different jobs across these seven products, and the differences are commercial.
True isolated workspaces with white label are what Smartlead sells at $29 per month per client workspace from the Pro plan upward, with three included on Unlimited Prime. Each client gets a separate container and your branding.
A unified agency workspace with roles is what Reply.io's Agency plan provides: unlimited clients and users inside one dashboard with roles and permissions and white label, rather than fully separate tenancies.
A per-client panel is Woodpecker's model at $27 per active client, which bills for exactly the clients you are currently serving.
Guest seats are what Lemlist offers, five on self-serve and unlimited on Enterprise. A guest seat is not a workspace, and treating it as one runs into the sending-address ownership rule.
Before signing anything, ask one question in writing: if client A and client B both exist in this account, can any user with client A access see any data belonging to client B? The answer separates these products more cleanly than any feature comparison.
Sending accounts, pooled contacts and the shared warm-up question
Three operational realities that get discovered after purchase.
Mailbox metering. Smartlead, Instantly, Reply.io Agency and Woodpecker all include unlimited email accounts. Snov.io charges $5 per managed mailbox per month. For an agency running 48 mailboxes across eight clients, that is a $240 monthly line that simply does not exist on the other four.
Pooled contacts. Ask whether contact records and suppression lists are scoped per client or shared across the account. Shared suppression sounds responsible and is wrong for an agency: two clients legitimately targeting the same account should both be able to, and a platform that silently suppresses one is destroying deliverables you have been paid for.
Shared warm-up pools. Both Smartlead and Instantly operate warm-up pools, which means your clients' domain reputations are being built through interaction with mailboxes you do not control. This is a real consideration, not a theoretical one, and it is worth asking each vendor whether a dedicated or isolated warm-up option exists and what it costs. Woodpecker's per-mailbox warm-up at $5 each, and its dedicated servers at $59, represent the opposite philosophy.
APIs and reply handling
API access is $20 per month on Woodpecker, published as a line item. Smartlead documents an API for its plans. Instantly and Reply.io both expose APIs on higher tiers. Snov.io includes API access in its tiers. If your onboarding involves provisioning six mailboxes, three domains and two campaigns per client, an API turns a manual afternoon into a script, and that is the difference between eight clients and twenty.
Reply handling differs more than it should. Smartlead offers a master inbox, Instantly a unified inbox, Reply.io a centralised inbox on all plans, Lemlist a centralised multichannel inbox on its multichannel tier. The question to ask is whether replies can be routed differently per client, because some clients want their own team handling responses and some want yours doing it. A single global inbox forces one answer for everyone.
Modelling per-client margin
Agency purchasing decisions should be made per client, not per platform. Model it as five lines.
Platform share. Total plan cost divided by client count, or the per-client fee where one exists.
Workspace or panel fee. $29 per month on Smartlead white label, $27 per active client on Woodpecker, zero on Reply.io Agency.
Pricing basis: Snov.io. Select the current credit and recipient capacity, then price any LinkedIn or mailbox add-ons separately. A legacy tier listing should not override the vendor’s current offer.
Verification and data. Metered on every platform here. Budget it separately from sending.
Your time. Setup, monitoring and reply management. This is the largest line and the one most often left out.
Run this before you price your retainer. A platform that looks affordable at one client can become expensive at ten if every client needs separate infrastructure and branded access, and the reverse is also true: usage-metered platforms get cheaper per client as client count rises and volume per client stays flat.
Additional tools to consider
Worth a look depending on the shape of your client book.
Saleshandy is a cold email platform with unlimited email account connections and sequence-level analytics, positioned against the unlimited-mailbox tier of this category.
Emelia is a European cold email and LinkedIn sender with a simplified pricing structure and agency-oriented client separation.
Ditlead bundles email sending, verified data, warm-up and calling into a single subscription aimed at multi-channel operators.
La Growth Machine prices per identity rather than per seat and covers LinkedIn and email in one sequence, with a public API.
Mystrika is a cold email tool built around per-mailbox rotation and unified inbox handling for high mailbox counts.
FAQ: Cold Email Platforms for Agencies
What does Smartlead actually cost an agency?
Include the platform, client workspaces, branding requirements, domains, mailboxes and any verification or testing services. The base subscription is only comparable when the same agency configuration is included.
Which platform is cheapest per client?
Compare the same client workload, including connected accounts, active contacts and operator access. A low platform fee can be offset by workspace or infrastructure costs.
Do these platforms limit how many email accounts I can connect?
Smartlead, Instantly, Reply.io and Woodpecker all include unlimited email accounts. Snov.io charges $5 per month per managed mailbox, which becomes a significant line at agency mailbox counts. Lemlist requires that all sending addresses on a seat belong to the same person, which is a stricter constraint than a numerical limit.
Are shared warm-up pools a problem for agency clients?
They are a real consideration. Warm-up pools build sending reputation through interactions with mailboxes outside your control, which means your client's domain reputation is partly a function of strangers' behaviour. Ask each vendor whether dedicated or isolated warm-up is available and what it costs. Woodpecker's per-mailbox warm-up and dedicated servers represent the alternative approach.
Should contact suppression be shared across clients?
No. For an agency, two clients targeting the same account is normal and legitimate, and a platform that suppresses one because the other reached that account first is silently reducing what you deliver. Confirm that suppression lists are scoped per client workspace before you migrate a client book.
Do I need an API to run an agency on one of these?
Not at three clients. By ten it is close to essential, because provisioning mailboxes, domains and campaigns manually per client becomes the constraint on growth. Woodpecker publishes API access at $20 per month, and the other platforms expose APIs on various tiers. Check what the API can create rather than only what it can read.
Sending software is one part of the operating setup. Our guide to cold email deliverability tools covers the adjacent options.
Work with Forma Nôrden
We build signal-based outbound systems for B2B companies selling into the enterprise and upper mid-market, and we design the sending architecture agencies run on. If your platform cost is growing faster than your client book, that is usually a structural problem rather than a pricing one. Explore how we work.
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