The verdict
On the data we hold, it's close: neither pulls ahead on features, a free plan or AI access. The choice comes down to how you work.
What the data says
- Warmup Inbox starts lower, at $15/mo against $35/mo.
- In our Outbound ranking, Kixie places 30 and Warmup Inbox 6 of 33.
Side by side
| At a glance | KIKixie | |
|---|---|---|
| Starts at | $35/mo | $15/mo |
| Free plan | No | No |
| API | Yes | Yes |
| MCP server | No | No |
| Links |
Plans and pricing
KI
Kixie
- IntegratedSmall teams focused on basic CRM logging and click-to-call$35/mo
- ProfessionalActive sales teams requiring unlimited US/Canada minutes$65/mo
- PowerDialerHigh-volume SDRs executing multi-line parallel dialing$95/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 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.
Other options worth a look
Tool·Client acquisitionRuns multichannel cold outreach with built-in email warmup, lead database, and deliverability scoring.Outbound
From $55/mo yearlyAffiliate link
Tool·Client acquisitionFind B2B prospects and run email and phone outreach campaigns from one unified platform.Outbound
From $49/moFree planAffiliate link
Tool·Client acquisitionSends high-volume cold email across multiple mailboxes with automated warmup and a unified reply inbox.Outbound
From $85/mo yearlyAffiliate link
Tool·Client acquisitionAutomates outreach across email, LinkedIn, calls and SMS to coordinate your sales prospecting in one place.Outbound
From $49/mo yearlyAffiliate link
Tool·Client acquisitionRun cold email outreach at scale with unlimited mailboxes, warm-up automation and lead verification.Outbound
From $32/mo yearly- Tool·Client acquisitionIdentifies website visitors by company and provides EU-based B2B contact data with buyer intent signals.
Outbound
From €79/mo yearlyFree planAffiliate link