Compare/Head to head

Cheap Inboxes vs InboxKit

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

Starting price

Cheap Inboxes

$3.50/mailbox/mo

Google and Microsoft inboxes for cold email, from $3.50 per mailbox per month. REST API and MCP included.

Where Cheap Inboxes fits

  • Agencies automating inbox orders through MCP
  • Teams that want one domain per workspace
  • Senders exporting over OAuth to Instantly or Smartlead
  • Buyers starting under 100 mailboxes

InboxKit

$2.50/mailbox/mo

US-IP Google Workspace and Microsoft 365 mailboxes for cold email, with SPF, DKIM and DMARC set up for you and export to 24+ sequencers. One flat rate per mailbox: $3.00 a month, or $2.50 on annual billing, with no plan or minimum.

Where InboxKit fits

  • Agency recruiters sending cold email to hiring managers at volume
  • Teams already sequencing in Instantly, Smartlead, Lemlist or Apollo
  • Teams that want to automate mailbox setup through an API

At a glance

DetailCheap InboxesInboxKit
Starting price$3.50/mailbox/mo$2.50/mailbox/mo
Free tier–No–No
MCP server✓Yes–No
Public API✓Yes✓Yes
Listed underDeliverabilityDeliverability

Where they pull apart

Cheap Inboxes

Stands out: MCP at api.cheapinboxes.com/mcp plus a REST checkout so agents can provision domains and mailboxes.

Watch out: The $3.50 rate is the 1-99 mailbox tier. Volume drops to $2.80 at 1,000-plus. Domains start at $2.50 per year extra.

Not the right fit for

  • Senders who need dedicated SMTP IPs they control
  • Teams that want domains included in the $3.50 rate

InboxKit

Stands out: Each domain gets its own isolated admin panel, so one damaged domain does not drag the others down. A full REST API with webhooks lets agencies provision mailboxes automatically when a new client signs, and an Azure option covers up to 100 mailboxes for $30 a month.

Watch out: Warmup is not included: it is a $3 per mailbox a month add-on, more than the annual mailbox price itself. The $2.50 rate needs annual billing, and there is no free trial, though you can start with a single mailbox. The 90%+ inbox placement figure is the vendor's own claim.

Not the right fit for

  • Recruiters sending a handful of emails a day from their own inbox
  • Teams that want warmup and sending included in one price

Pros and cons

Cheap Inboxes

  • $3.50/mailbox/mo under 100
  • MCP and REST API included
  • Google and Microsoft same price
  • Domains extra from $2.50/year
  • No published free trial
  • Not dedicated SMTP you control

InboxKit

  • Same price for Google and Microsoft mailboxes
  • No plans, slots or minimums
  • Full API with webhooks
  • Warmup costs extra
  • No free trial
  • No sequencer of its own

What each one costs

Cheap Inboxes

$3.50/mailbox/mo

1-99 mailboxes $3.50/mailbox/month, 100-249 $3.25, 250-999 $3.00, 1,000+ $2.80. Same price for Google and Microsoft. Domains from $2.50/year. API and MCP included. No free trial stated. Confirm current terms on the vendor site.

Checked 4 Nov 2026

InboxKit

$2.50/mailbox/mo

InboxKit charges one flat rate per mailbox, with no plans, no minimum and no base fee. Google Workspace and Microsoft 365 mailboxes cost the same: $3.00 a month on monthly billing, $2.70 on quarterly and $2.50 on annual. Azure is billed per tenant at $30 a month for up to 100 mailboxes. Isolated warmup is an add-on at $3 per mailbox a month, and the InfraGuard monitoring add-on has its first month free. You pay from a prepaid wallet. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Common questions

Is Cheap Inboxes cheaper than InboxKit?
InboxKit starts lower, at $2.50/mailbox/mo against $3.50/mailbox/mo for Cheap Inboxes. That is the entry plan on each side, so the real number depends on seats and the tier you land on.
Can you try Cheap Inboxes or InboxKit for free?
Neither carries a free tier on our listing.
Does Cheap Inboxes or InboxKit have an MCP server?
Cheap Inboxes ships a first party MCP server, so an AI assistant can work the product directly.

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