Head to head

Hypertide vs InboxKit

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

Hypertide

$3.30/inbox/mo

Google, Microsoft, and Entra inboxes for cold email. Google inboxes are $3.30 each per month with no minimum.

Where Hypertide fits

Teams that want one Google inbox or ten thousand at the same rate
Agencies buying Entra domains at $25 for 25 inboxes
Senders exporting over OAuth or SMTP to Instantly or Smartlead
Shops that want API access and unlimited seats included

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

Detail	Hypertide	InboxKit
Starting price	$3.30/inbox/mo	$2.50/mailbox/mo
Free tier	–No	–No
MCP server	–No	–No
Public API	✓Yes	✓Yes
Listed under	Deliverability	Deliverability

Where they pull apart

Hypertide

Stands out: Flat $3.30 per Google inbox, no packages, plus Entra domains at $25 with 25 inboxes included.

Watch out: No free trial. Entra is the volume SKU; Google is per inbox. Month-to-month, cancel in the app.

Not the right fit for

Buyers who want a free trial before the first inbox
Teams that only want cheap shared SMTP under $1

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

Hypertide

$3.30/inbox/mo, no minimum
API and unlimited seats included
Entra domains at $25 for 25 inboxes

No free trial
Not a sub-$1 SMTP shop
Entra and Google are separate SKUs

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

Hypertide

$3.30/inbox/mo

Google inboxes $3.30/inbox/month with no minimum. Entra domains $25/domain/month including 25 inboxes. API, unlimited seats, Relay, Layover, and DNS included. No free trial. Month-to-month, cancel in the app. 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 Hypertide cheaper than InboxKit?

InboxKit starts lower, at $2.50/mailbox/mo against $3.30/inbox/mo for Hypertide. That is the entry plan on each side, so the real number depends on seats and the tier you land on.

Can you try Hypertide or InboxKit for free?

Neither carries a free tier on our listing.

Not the pair you wanted?

All Hypertide alternatives All InboxKit alternatives Every Deliverability tool

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