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How we stack up, including where we lose.

Each page says plainly when the other product is the right answer. None of them quotes a competitor's price, because those change and a stale number on our site would be a false statement about someone else's business.

One tool instead of four.

A team inbox, a sending API, somewhere for replies to land, and agents on top: usually four vendors and four bills.

What each kind of product covers, compared with Koltrix
What you need	Koltrix	Mailbox host	Sending API	Marketing tool
Team inbox on your domain	Yes	Yes	No	No
Transactional API and SMTP	Yes	No	Yes	No
Replies to product mail reach a human	Yes	No	No	No
AI triage, drafts and follow-ups	Yes	No	No	No
One bill	Yes	No	No	No
Starting price	$12/month	Priced per user, per volume or per contact — see each vendor

Product by product

Koltrix vs Google Workspace

Google Workspace gives your team mailboxes. Koltrix gives your team mailboxes, the API your product sends with, and agents that triage and draft — on one bill. An honest comparison, including where Workspace wins.

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Koltrix vs Zoho Mail

Zoho Mail is inexpensive custom-domain email with a large suite behind it. Koltrix is a team inbox plus the sending API your product needs, with AI agents. Where each one fits.

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Koltrix vs Resend

Resend is a developer-first transactional email API. Koltrix sends the same kind of mail and also gives your team a real inbox on the same domain, so replies have somewhere to go.

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Koltrix vs Postmark

Postmark is the gold standard for transactional deliverability and speed. Koltrix sends transactional mail too, and adds the team inbox on the same domain. An honest look at both.

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Koltrix vs Mailchimp

Mailchimp is a marketing platform built around campaigns and audiences. Koltrix is the email stack your team and your product run on. They solve different problems — here is which one you actually have.

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