Kanbox vs Warmup Inbox

Two Outbound tools side by side: what each does, what it costs and who it suits.

The verdict Side by side Plans and pricing Who each is for Other options

The verdict

On the data we hold, Warmup Inbox comes out ahead. Here is why, point by point.

What the data says

Warmup Inbox covers more of the features we compared: 2 of 2, against 1.
Only Kanbox has an MCP server, so an AI employee can work in it directly.
In our Outbound ranking, Warmup Inbox places 6 and Kanbox 9 of 33.

Side by side

Kanbox and Warmup Inbox compared
6 points compared	Kanbox	Warmup Inbox
Starts at	€15/mo	$15/mo
Free plan	No	No
API	Yes	Yes
MCP server	Yes	No
Built-in email warmup	No	Yes
Built-in outreach (sequences/dialer)	Yes	Yes
Links	Visit	Visit

Plans and pricing

Kanbox

StarterOne LinkedIn account; EUR 15 per month billed yearly.€25/mo
EssentialPriced per LinkedIn account; EUR 30 per account per month billed yearly.€45/mo/seat
ProPriced per LinkedIn account; EUR 50 per account per month billed yearly.€80/mo/seat
Agency 10For 5 to 10 LinkedIn accounts; EUR 279 per month billed yearly.€399/mo

Warmup Inbox

BasicPer inbox per month; 75 warm-up messages a day. Volume discounts as you add inboxes.$15/mo
ProPer inbox per month; 250 warm-up messages a day plus custom templates and scheduling.$49/mo
MaxPer inbox per month; 1,000 warm-up messages a day plus API access and premium support.$79/mo

Prices as the vendors list them. They change often; the final price is on their sites.

Who each is for

Choose Kanbox if…

Solo founders, sales reps, recruiters and small agencies whose outreach happens mainly on LinkedIn and who want scraping, outreach automation and a lightweight Kanban CRM in one workspace.

Visit Read the review

Choose Warmup Inbox if…

Sales, SDR and agency teams about to send cold email from new mailboxes, who need those mailboxes warmed up and monitored so campaigns reach the primary inbox.

Visit Read the review

Other options worth a look

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Instantly
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Automates outreach across email, LinkedIn, calls and SMS to coordinate your sales prospecting in one place.
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Smartlead
Run cold email outreach at scale with unlimited mailboxes, warm-up automation and lead verification.
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Dealfront
Identifies website visitors by company and provides EU-based B2B contact data with buyer intent signals.
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