testmail.app

Mailosaur alternative built for scale

As your tests grow, Mailosaur's daily email limits and per-seat charges add up fast. testmail.app offers unlimited users, no per-seat fees, and pricing that stays flat as you scale.

Helping teams at

interacjohnsoncontrolsapolloverorbimercksalesforceworkdayatlassianpbstoyotaadobemediumcartaoptimizelysapxeroxassabloyenvatophilipstransunioninteracjohnsoncontrolsapolloverorbimercksalesforceworkdayatlassianpbstoyotaadobemediumcartaoptimizelysapxeroxassabloyenvatophilipstransunion

Get started with our free forever plan

No credit card required

testmail.app vs Mailosaur: a direct comparison

More emails, SSO and enterprise invoicing included, at a fraction of the price.
testmail.app
Mailosaur
Enterprise
Plan name
Core (max self-serve)
Plan name
1,000,000
Emails/m
~750,000
Emails/m
Unlimited
Users
5, then $25/seat/m
User limit
No
Daily limit
Yes
Daily limit
✓ Included
SSO (SAML 2.0 & OIDC)
Talk to Sales
SSO
✓ Included
Enterprise invoicing
Talk to Sales
Enterprise invoicing
$129/m
$89/m annually
$625.5/m
$500/m annually

*Pricing as on Oct 2026. Mailosaur: Core plan, 5 users, 25,000 emails/day, per Mailosaur's pricing calculator. Monthly volume = daily limit × 30.

Looking for a specific feature? Here's what testmail.app costs vs Mailosaur.

Need SSO?
testmail.app starts at
$89/m
Mailosaur starts at
Custom
Need users?
testmail.app starts at
Free
Mailosaur starts at
$20/m
Need invoicing?
testmail.app starts at
$89/m
Mailosaur starts at
Custom

Switching from Mailosaur to testmail.app?

Reach out to us at [email protected], and we'll send you our migration guide and help you get set up.

Highlights

Namespace-based inbox isolation for parallel CI/CD testing

testmail.app uses a namespace-and-tag address format — {namespace}.{tag}@inbox.testmail.app — where every unique tag is a fully isolated inbox created instantly, with no setup. Change the tag per test run and parallel tests never read each other's emails.

Namespace-based inbox isolation for parallel CI/CD testing

Test every email your application sends — end-to-end

Capture signup verification, password reset links, magic links, 2FA codes, order confirmations, and drip triggers in private inboxes. Use the API to retrieve each email, extract the link or token, and continue the test programmatically — across local development, shared staging environments, and CI pipelines.

Test every email your application sends — end-to-end

GraphQL and REST API — query exactly the email you need

Query emails by sender, tag, subject, or body content with wildcard matching and live queries — so your tests wait for the right email to arrive instead of sleeping on a timer.

  • Full header inspection, attachment access, and spam score via API
  • No proprietary SDK required — standard HTTP or GraphQL
  • Paginated results, date filtering, and wildcard search built in
GraphQL and REST API — query exactly the email you need

Signup and get your API key

it takes 30 seconds

FAQ

Why choose testmail.app over Mailosaur?

testmail.app offers more email volume, unlimited users, and no per-seat charges at a lower price point. Mailosaur sizes plans by daily email limits and charges $25/m for each seat beyond the first five. At 25,000 emails/day, Mailosaur Core costs $625.50/m, while testmail.app Enterprise includes 1,000,000 emails/month, SSO, and enterprise invoicing for $129/m ($89/m billed annually).

Can I migrate from Mailosaur to testmail.app easily?

If you are switching from Mailosaur, start by mapping your critical email flows across each environment so QA keeps moving during the changeover. Recreate your inboxes and update test credentials.

What is the best Mailosaur alternative for QA?

For QA teams that need isolated inboxes, API-driven email assertions, and predictable pricing, testmail.app is a strong alternative to Mailosaur, with unlimited users and no daily caps. You can try it on the free plan with no credit card required.

What is the Mailosaur inbox equivalent in testmail.app?

In Mailosaur, each inbox has its own unique domain and accepts unlimited email addresses. In testmail.app, namespaces serve the same purpose. Every email is received at {namespace}.{tag}@inbox.testmail.app, where the tag can be anything you choose, giving you unlimited unique addresses with no extra setup.

On Pro and above you get unlimited custom namespaces. If you need to receive email at your own domain, custom domains are available on the Enterprise plan ($89/m) and above.

Does testmail.app support SSO?

Yes. SSO with SAML 2.0 and OIDC is included on the Enterprise plan ($89/m billed annually). On Mailosaur, SSO is only available through a sales conversation.

Product
Resources
Free tools
Legal
© testmail.app