Mailshake 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, 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

Both cover 2 of the 2 features we compared.
Warmup Inbox starts lower, at $15/mo against $25/mo.
In our Outbound ranking, Mailshake places 12 and Warmup Inbox 6 of 33.

Side by side

Mailshake and Warmup Inbox compared
6 points compared	Mailshake	Warmup Inbox
Starts at	$25/mo	$15/mo
Free plan	No	No
API	Yes	Yes
MCP server	No	No
Built-in email warmup	Yes	Yes
Built-in outreach (sequences/dialer)	Yes	Yes
Links	Visit	Visit

Plans and pricing

Mailshake

Starter1 email address, 1,500 sends a month, unlimited contacts and campaigns. Annual shown as 25 per month.$29/mo/seat
Email Outreach2 email addresses, unlimited sends, rotation, unified inbox and CRM integrations. Annual shown as 45 per month.$49/mo/seat
Sales Engagement10 email addresses, unlimited sends and 5 phone numbers with a dialer. Annual shown as 85 per month.$99/mo/seat

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 Mailshake if…

B2B sales teams, agencies and founders who run email-led cold outreach and want simple sequences, follow-ups, deliverability tools and a built-in lead finder in one tool.

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

ToolClient acquisition
Lemlist
Runs multichannel cold outreach with built-in email warmup, lead database, and deliverability scoring.
Outbound
From $55/mo yearlyAffiliate link
Sign up on Lemlist
ToolClient acquisition
Apollo
Find B2B prospects and run email and phone outreach campaigns from one unified platform.
Outbound
From $49/moFree planAffiliate link
Sign up on Apollo
ToolClient acquisition
Instantly
Sends high-volume cold email across multiple mailboxes with automated warmup and a unified reply inbox.
Outbound
From $85/mo yearlyAffiliate link
Sign up on Instantly
ToolClient acquisition
Reply.io
Automates outreach across email, LinkedIn, calls and SMS to coordinate your sales prospecting in one place.
Outbound
From $49/mo yearlyAffiliate link
Sign up on Reply.io
ToolClient acquisition
Smartlead
Run cold email outreach at scale with unlimited mailboxes, warm-up automation and lead verification.
Outbound
From $32/mo yearly
Sign up on Smartlead
ToolClient acquisition
Dealfront
Identifies website visitors by company and provides EU-based B2B contact data with buyer intent signals.
Outbound
From €79/mo yearlyFree planAffiliate link
Sign up on Dealfront