Compare/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.

Starting price

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

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

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: 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

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

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

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 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 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 4 Nov 2026. Confirm current terms on the vendor site. Spot an error?