Comparison, Cold email, Agencies
Best Cold Email Software for a Lead Generation Agency With Many Clients (2026)
For an agency with many clients, the question is not features but structure: how each client is kept apart, what a client can see, and what each extra client adds to the bill. Here is how six tools answer it.
7 min read
In this article
For a lead generation agency, the tools that describe client structure most fully are Smartlead (client accounts with white label as a paid add-on), Woodpecker (an Agency Panel priced per active client) and Saleshandy (unlimited clients, with white label under Enterprise). Instantly keeps each client in a separate workspace, but every workspace needs its own subscription. Warmerly's Agency plan gives you unlimited client workspaces on one bill and one shared pool of mailboxes, but it has no white label and no client-only login. Which is right depends on whether clients log in, whether they should see your brand, and how you want extra clients to be billed.
Cold email software for agencies with many clients, compared
| Tool | How clients are kept apart | Client login or view | White label | What more clients add to the bill |
|---|---|---|---|---|
| Smartlead | Client accounts with their own permissions and credit allowances | Yes, clients get a login; reply-only access is described | Yes, as an add-on at $29 a month per client workspace | Clients start on Pro ($94 a month); Prime ($379) includes 3 clients; add-on price per extra client not shown on the page |
| Instantly | Separate workspaces, each with its own campaigns, contacts and analytics | Team roles including View / VA Access; client portal not described | Not mentioned on its pricing or workspace pages | Each workspace requires its own subscription |
| Woodpecker | Agency Panel add-on with a separate prospects database per client | Client view-only access; clients connect their own mailboxes without sharing passwords | Listed at $5 a month per active client; what it covers is not described on the pricing page | $27 a month per active client for the Agency Panel |
| Saleshandy | Separate teams or workspaces, unlimited clients from one account | Not described | Listed under Enterprise | Not clear which plans include unlimited clients |
| lemlist | Not described for agencies | Teammate invites and shared campaigns | Not mentioned | Priced by the number of users |
| Warmerly | Unlimited client workspaces on the Agency plan, each with its own mailboxes, campaigns, leads and inbox | No client-only login; people you invite join as owner, admin or member | No | Nothing per client. All clients share the Agency plan's allowances; $179 a month |
What a lead generation agency should check
- Separation. Each client's mailboxes, leads and replies should sit apart, so one client's problem never touches another's and you can close a client cleanly. Instantly's help page notes an email account can connect to only one workspace at a time.
- Client access. Some agencies send clients a login, some send a report, some give clients nothing. Decide which you do before comparing tools, because it rules several out.
- White label. If you resell the software or want clients to see your brand and domain, only some tools offer it, usually as an add-on or a higher plan.
- What an extra client costs. Per-workspace subscriptions, per-client add-ons and one shared pool all behave very differently at 5 clients and at 25.
- Where the capacity limit is. Mailboxes, emails a month, contacts and leads per campaign are capped differently by each tool. Add up all your clients, not one.
- The inbox. When you answer replies for 20 clients, check whether the inbox shows all of them together or one client at a time. See our guide to unified inboxes for cold email replies.
How each tool handles many clients
Smartlead: the most complete client and white label setup we found
Smartlead's help center describes a Client Access Dashboard. You add a client with a name, company and email, choose their permissions and Master Inbox categories, and allocate email and lead credits. Its white label article says clients can use the app under your branding and domain name with your logo, and mentions a restricted, reply-only access option, for example showing a client only Interested replies. Its pricing page says the option to add clients starts on the Pro plan ($94 a month), Prime ($379 a month) includes 3 clients, and white labeling is an add-on at $29 a month per client workspace. The pricing page shows client limits as icons rather than numbers, so ask Smartlead how many clients your plan holds before you commit. If you want to resell the tool under your own brand, this is the closest fit of the six.
Instantly: a workspace per client, a subscription per workspace
Instantly's help center says workspaces are completely separate spaces, mainly meant for agencies that used to keep a login per client. Each has its own campaigns, contacts and analytics, you use one login and switch from the logo, and team roles include Admin, Editor and View / VA Access. The cost point is stated plainly: "Each workspace requires its own subscription." Three clients means three subscriptions, each of which can be on a different plan. That is clean separation and simple per-client costing, and it is a good fit if you want to pass each client's tool cost straight on. It is a poor fit if you want one shared pool. We did not find a client portal or white label on Instantly's pricing or workspace pages. Its pricing page also shows conflicting price sets, so we quote no Instantly price here.
Woodpecker: an Agency Panel priced per active client
Woodpecker sells an Agency Panel add-on at $27 a month per active client. Its pricing page lists a separate prospects database, all client stats in one panel, client view-only access, clients connecting their own mailboxes without sharing passwords, automated audits of client domains and centralized billing. White label is listed separately at $5 a month per active client, but the pricing page does not say what it covers; its agency page mentions a client reporting app on your domain with your branding. As arithmetic only: 10 active clients is $270 a month for the panel, on top of the base plan. Every plan has unlimited team members and email accounts, per its pricing page. That per-client model is easy to resell, and it costs more as the number of active clients grows.
Saleshandy: unlimited clients, white label on Enterprise
Saleshandy's pricing page says you can "Run outreach for unlimited clients from one account" and create as many separate teams or workspaces as you need, each with its own members and settings. It lists white label, running the platform under your own brand and domain, under Enterprise. The page does not make clear which plans include unlimited clients, so confirm that with Saleshandy. We found no further agency detail on a second Saleshandy page.
lemlist: strong for teams, silent on agencies
lemlist's pricing page says pricing is based on the number of users and lists teammate invites and shared campaigns. It does not mention agencies, client workspaces or white label. That does not mean lemlist cannot be used for client work, only that we could not verify a client structure, so ask before you plan around it. If your agency sells multichannel outreach with LinkedIn steps and personalised images, lemlist may still suit you better than a tool built around mailbox volume.
Warmerly's Agency plan
On the Agency plan ($179 a month) you can create as many client workspaces as you need. Each has its own mailboxes, campaigns, leads and inbox, and none carries its own subscription: they draw on the Agency plan's allowances as one pool, and everything is billed to the Agency workspace. The pool is 100 mailboxes in total across all clients, 250,000 active prospects, and 100,000 leads in a single campaign, with no cap on active campaigns and no cap on emails sent (each mailbox keeps its own safe daily limit). Warmup runs on every connected mailbox, and API access and webhook alerts are included on Agency. A new client workspace skips the setup wizard and starts with your sender details already filled in. Email, LinkedIn and WhatsApp campaigns run from the same account; LinkedIn accounts are billed separately.
Which one should you pick?
- You resell the tool under your own brand and domain: Smartlead (add-on per client workspace), or Woodpecker's white label. Check exactly what each white label covers first.
- Clients log in to see replies or reports: Smartlead's client access, or Woodpecker's view-only access.
- Each client should have its own subscription and invoice: Instantly.
- You want a cost that does not rise with each client, and you manage the accounts yourself: Warmerly Agency, up to 100 mailboxes in total.
- You run a small team and mostly one brand, not a client roster: lemlist, or a smaller plan elsewhere.
Frequently asked questions
What is the best cold email software for a lead generation agency?
It depends on how you serve clients. Smartlead describes client access and white label most fully. Instantly gives each client a separate workspace with its own subscription. Woodpecker prices an Agency Panel per active client. Warmerly's Agency plan gives unlimited client workspaces on one bill, without white label.
Which cold email tools offer white label for agencies?
Smartlead lists white labeling as an add-on at $29 a month per client workspace. Woodpecker lists white label at $5 a month per active client. Saleshandy lists it under Enterprise. Warmerly does not offer white label.
Does each client need a separate subscription?
On Instantly, yes: its help center says each workspace requires its own subscription. In Warmerly, no: client workspaces on the Agency plan share one pool and one bill. Smartlead and Woodpecker charge through add-ons rather than separate subscriptions.
Can my clients log in to see their replies?
In Smartlead and Woodpecker, yes, with restricted or view-only access. In Warmerly there is no client-only login, so a client who logs in joins the workspace as a full member.
How many mailboxes can an agency connect on Warmerly?
The Agency plan covers 100 mailboxes in total across the Agency workspace and every client workspace. There is no published plan above that, so contact us before buying if you run more.
