Mailpit vs testmail.app
Mailpit
mailpit.axllent.orgtestmail.app
testmail.appSide by side
| Figure | Mailpit | testmail.app |
|---|---|---|
| Price from | Free | $9/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 6 |
| Spec score · Email Testing Software | 8.6 (#6) | 8.3 (#9) |
| Integrations | The project says Mailpit is used by projects including Laravel, DDEV, Quarkus, and Saleor, and in CI/CD pipelines. | The maker documents examples for using testmail.app with Cypress, Selenium, and TestCafe, including email OTP testing examples. |
| Intended users | Mailpit is aimed at developers testing email functionality without sending messages to real email addresses. | The maker positions the free plan for side projects and describes Essential as for small projects, while its homepage highlights developers and QA teams. |
| Purpose | Mailpit is an open-source utility for testing emails and SMTP delivery, with a local SMTP server, web interface, and integration-testing API. | testmail.app receives, parses, spam-tests, and indexes test emails so they can be retrieved by API for automated end-to-end testing. |
| Security | The web UI supports optional HTTPS and basic authentication, while SMTP can be configured with authentication and TLS. | The maker states that HTTPS/TLS is enforced, data is encrypted in transit and at rest, and logins are passwordless. |
| Security controls | The web UI and API can use HTTPS and basic authentication, while SMTP supports optional STARTTLS or SSL/TLS and authentication. | The security page states TLS 1.2 minimum, TLS 1.3 where supported, encrypted AWS volumes, WAF and DDoS protection, passwordless login and namespace-scoped API keys. |
| Support | The troubleshooting guide invites users to raise an issue after checking existing issues first. | The maker says support comes from real engineers and that most priority requests are answered within minutes. |
Plans
testmail.app
- FreeFree
- Essential$9 a month
- Pro$29 a month
- Enterprise$89 a month
- Unlimited$269 a month
- CustomPriced on request
In their own words
Mailpit
Mailpit is a free, open-source tool for checking email content and SMTP delivery without sending messages to real addresses. It runs a local SMTP server alongside a web interface and REST API, and is available for Linux, macOS, Windows, Docker, and self-hosted deployment. The interface displays formatted HTML, source, text, headers, raw messages, and MIME attachments with image thumbnails. Checks include HTML and link testing, message screenshots, and optional SpamAssassin scoring. The API can access, search, send, delete, tag, and release messages; messages can also be relayed, forwarded, or used to trigger configurable SMTP errors. Mailpit can send message-summary webhooks and offers a Cypress package for integration tests. The web UI and API can use HTTPS and basic authentication; SMTP supports optional authentication and TLS. By default, SMTP listens on port 1025 without encryption or authentication. Mailpit keeps the most recent 500 messages by default.
testmail.app
testmail.app receives, parses, spam-tests, and indexes test emails for automated end-to-end testing. Messages sent to addresses such as `{namespace}.{tag}@inbox.testmail.app` are routed into mailboxes, allowing tests to create addresses and mailboxes dynamically. The service provides simple JSON and GraphQL APIs, with client examples for JavaScript, PHP, Ruby, Python, Go, Bash, C#, and Java. Search includes wildcard queries, live waits for new mail, sorting, pagination, attachments, and SpamAssassin reports. GraphQL adds advanced filters, field selection, and custom sorting unavailable in the simple JSON API. Documented integrations cover Cypress, Selenium, TestCafe, and email OTP testing. New accounts receive a 14-day trial without a credit card, then move to the free plan. Free includes 100 emails monthly and one-day retention. Paid plans start at $9/mo (annual). Hosting uses AWS, with encrypted data and passwordless logins.