CampaignStack vs Smartlead: white-label email against two channels

Smartlead built the version of cold email that agencies resell. Every plan carries unlimited email accounts, the warmup pool is included rather than metered, and when shared infrastructure is not enough you rent a dedicated SmartServer for $39 a month and send on your own lane. Mailbox setup is a service too, from $4.50 per mailbox monthly. The entry price is the lowest of the serious platforms: $39 a month for 6,000 emails, $174 for 150,000 with unlimited contacts.

The white-label is the part rivals rarely match. For $29 a month per client you get an isolated workspace under your own brand, served from your own domain at app.yourdomain.com, where the client logs in and sees reports and campaigns without ever hearing the word Smartlead. The public API can even create those client workspaces programmatically, which is how larger agencies onboard at volume. A Master Inbox holds every client's replies in one view. For an agency whose offer is done-for-you cold email, this is the platform built most exactly for the job.

Smartlead does not run LinkedIn, and its own site is straightforward about it: the integrations page answers the multichannel question by pointing at HeyReach and Aimfox, and lists Expandi and Waalaxy among its partners. So the LinkedIn half of a Smartlead stack is a second subscription and a second dashboard, plus a sync between the two that you configure and maintain. The channel Smartlead does add natively is the phone, through SmartDialer, which nothing on our side matches.

CampaignStack runs LinkedIn and email in one workflow graph. Each LinkedIn account gets its own encrypted browser profile on our server behind a residential proxy, with per-action-type daily budgets, usage-based warm-up, weekly invite caps and an automatic pause on risk signals; email steps run in the same graph with their own send budgets. A lead who accepts an invite on Tuesday does not get the day-one cold email on Wednesday, because one system holds both threads.

Smartlead's AI does real work: SmartAgents research leads, write personalized emails and update the CRM, and the AI Reply Manager prioritises hot leads and triggers the next step. What the product pages never describe is a checking step. There is no documented critique pass on a draft, and no queue where a doubtful message waits for a person; a campaign runs once launched, and the Master Inbox shows you what happened afterwards.

CampaignStack's position is that the draft is the risky part. Every AI draft here faces a critic that reads the full brief and objects with a concrete reason; a draft that keeps failing gets flagged and parked in a review queue where a human approves, edits or rejects it. If you want full autopilot you can run it, but the machinery for not trusting the machine is built in, and for an agency sending in a client's name that machinery is the product.

Both products are built for agencies, and the models genuinely differ. Smartlead sells you the platform to resell: ten white-labeled clients on the $174 Unlimited Smart plan cost $174 plus ten times $29, or $464 a month, sharing 150,000 emails a month across all of them. CampaignStack is $299 a month per client workspace, so the same ten clients cost $2,990. On price per branded login, Smartlead wins by a wide margin, and if branded cold email is the whole offer, that is the end of the analysis.

The $299 buys a different job. Each workspace carries its own LinkedIn accounts running on managed browser profiles, its own ICP scoring deciding who gets contacted, live signals, drafts checked by a critic, and a review queue in the client's name. The white-label here is thinner, workspace branding on client-facing reports with no client portal, and the honest read is that Smartlead sells agencies a product to rebrand while CampaignStack sells them a delivery layer to operate. Which one you need depends on whether your clients are buying emails sent or conversations started.