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.

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

Google Workspace and Microsoft 365 mailboxes from $2.50 per mailbox per month on yearly wallet billing. REST API included.

Where InboxKit fits

  • Agencies that want Google and Microsoft at the same rate
  • Teams billing mailboxes from a wallet with no minimum
  • Senders connecting Instantly, SmartLead, or Lemlist
  • Shops that need REST API and webhooks

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: Same $2.50 yearly rate for Google and Microsoft, with no slot minimum on wallet billing.

Watch out: The $2.50 figure is yearly Enterprise wallet billing. Warmup is $3 per mailbox extra. A FAQ still cites a $39 Professional pack.

Not the right fit for

  • Buyers who want warmup in the $2.50 rate
  • Teams that need a traditional free trial

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

  • $2.50/mailbox/mo yearly, no minimum
  • Google and Microsoft same price
  • REST API and webhooks included
  • Warmup is $3/mailbox extra
  • No traditional free trial
  • FAQ still cites a $39 pack

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 19 Sep 2026

InboxKit

$2.50/mailbox/mo

Google and Microsoft mailboxes $2.50/mailbox/month on yearly wallet billing, no minimum. Azure tenants $30/tenant/month. Warmup add-on $3/mailbox/month. FAQ also cites Professional from $39/month for 10 mailboxes; the printed wallet cards are $2.50. API included. No traditional free trial. Confirm current terms on the vendor site.

Checked 19 Sep 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.

Not the pair you wanted?

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Editorial listings, never paid rankings. Prices checked 19 Sep 2026. Confirm current terms on the vendor site. Spot an error?