Compare/Head to head

Instantly vs Warmbox

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

Starting price

Instantly

$37.60/mo Free trial

Cold-email infra for teams farming many sending mailboxes. Outreach Growth is $37.60/mo billed yearly, or $47/mo monthly.

Where Instantly fits

Outbound recruiting teams sending at volume
Agencies running many sending accounts
Desks that need warmup plus a unibox
Recruiters who want an agent to find candidates and send first outreach

Warmbox

$15/mo

Warmbox runs automated email warmup to lift sender reputation. The listing floor is $15/mo.

Where Warmbox fits

New domains that need a warmup network before cold volume
Solo senders who want a dedicated warmup tool under $20/mo
Agencies warming many client inboxes on a low per-box bill
Teams that already sequence in Instantly and want a second warmup opinion

At a glance

Detail	Instantly	Warmbox
Starting price	$37.60/mo	$15/mo
Free tier	–No	–No
Free trial	Yes	Not on record
MCP server	✓Yes	–No
Public API	✓Yes	–No
Listed under	Outreach	Deliverability

Where they pull apart

Instantly

Stands out: Warmup, unibox, and volume send with hosted MCP and a public API, plus an AI Recruiting Agent that finds candidates from a job link and emails them.

Watch out: Deliverability still depends on your domains and inboxes, not the tool alone.

Not the right fit for

Teams that only need LinkedIn messaging
Buyers looking for an ATS

Warmbox

Stands out: $15/mo is the cheapest dedicated warmup listing in this set, below Mailreach's $20/mo and well below Folderly's $79/mo monitor.

Watch out: Warmup is not sending. You still need a sequencer. Results take weeks, and a burned domain will not be saved by a $15 plan alone.

Not the right fit for

Buyers who want inbox-placement analytics, not a warmup bot
Teams that expect warmup to replace authentication and list hygiene

Pros and cons

Instantly

Warmup and unibox in the same desk
AI Recruiting Agent sources candidates and drafts outreach from a job link
Hosted MCP plus REST API
No-card get-started path on the vendor site

Sending domains and inboxes are bought separately
Sequence designer is plainer than multichannel rivals
Volume tiers step up quickly as mailboxes grow

Warmbox

Published $15/mo listing, low for a dedicated warmup network
Unbundled from any one sequencer
Simple job: reputation, not campaigns

Does not send campaigns or host mailboxes
Overlap with Instantly and Smartlead bundled warmup
Will not rescue a domain with a broken DMARC record

What each one costs

Instantly

$37.60/mo

Outreach plans: Growth $37.60/mo billed yearly, or $47 monthly, for 5,000 emails and 1,000 contacts; Hypergrowth $85.58/mo yearly, or $107 monthly, for 125,000 emails and 25,000 contacts; and Light Speed $286.30/mo yearly, or $358 monthly, for 500,000 emails. Lead credits are a separate plan from $47/mo, and bundles of both start at $94/mo. Every plan has unlimited email accounts and warmup. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Warmbox

$15/mo

Warmbox lists from $15/mo for automated email warmup. Confirm live per-mailbox versus flat pricing and any volume packs on the vendor pricing page. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Common questions

Is Instantly cheaper than Warmbox?

Warmbox starts lower, at $15/mo against $37.60/mo for Instantly. That is the entry plan on each side, so the real number depends on seats and the tier you land on.

Can you try Instantly or Warmbox for free?

Neither carries a free tier on our listing. Instantly offers a free trial.

Does Instantly or Warmbox have an MCP server?

Instantly ships a first party MCP server, so an AI assistant can work the product directly.

Not the pair you wanted?

All Instantly alternatives All Warmbox alternatives Every Outreach tool

Editorial listings, never paid rankings. Prices checked 4 Nov 2026. Confirm current terms on the vendor site. Spot an error?