Instantly 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, Instantly comes out ahead. Here is why, point by point.

What the data says

Both cover 2 of the 2 features we compared.
Warmup Inbox starts lower, at $15/mo against $85/mo.
Only Instantly has an MCP server, so an AI employee can work in it directly.
In our Outbound ranking, Instantly places 3 and Warmup Inbox 6 of 33.

Side by side

Instantly and Warmup Inbox compared
6 points compared	Instantly	Warmup Inbox
Starts at	$85/mo	$15/mo
Free plan	No	No
API	Yes	Yes
MCP server	Yes	No
Built-in email warmup	Yes	Yes
Built-in outreach (sequences/dialer)	Yes	Yes
Links	Visit	Visit

Plans and pricing

Instantly

StarterBundle with 5,000 emails per month, 1,000 uploaded contacts and 1,500 credits.$94/mo
ScaleBundle with 100,000 emails per month, 25,000 uploaded contacts and 5,000 credits.$194/mo
AgencyBundle with 500,000 emails per month, 100,000 uploaded contacts and 10,000 credits.$555/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 Instantly if…

B2B founders, agencies and outbound teams that run cold email at volume across many mailboxes and need warmup, rotation and one reply inbox without building the sending infrastructure themselves.

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

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Identifies website visitors by company and provides EU-based B2B contact data with buyer intent signals.
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Finds and verifies professional email addresses and sends cold email sequences from one workspace.
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