Dev tools · alternatives · 2026

24 alternatives to MockSMTP

Smart and simple e-mail testing on Mac OS X

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. MockSMTP launched in 2016; newer entries below may have overtaken it.

1. 1
   Mocke▲539

   Mock email campaigns: know your reply rate without launching

   2025 · mocke.co · its alternatives →

2. 2MO
   Mockit – Open-source app to create and configure HTTP mocked endpoints▲158

   2019 · mockit.netlify.com · its alternatives →

3. 3
   Postman for Mac (Beta)▲368

   Build, test, and document your APIs faster

   2016 · its alternatives →

4. 4
   SMTP Debug Tool▲346

   Test and debug your SMTP connection, quickly and for free

   2023 · its alternatives →

5. 5
   Mockoon▲89

   Mock servers in seconds

   2017 · its alternatives →

6. 6
   SMTP‑Test.com▲103

   One‑click SMTP server test with real‑time protocol logs

   2025 · smtp-test.com · its alternatives →

7. 7
   API_TESTER▲249

   Test your APIs right from the macOS menu bar

   2025 · apps.apple.com · its alternatives →

8. 8
   Decoy▲99

   Local server mocks in macOS, all in a lightweight native app

   Mar 2026 · decoy-app.com · its alternatives →

9. 9AF
   A fake SMTP server for software integration testing▲127

   This is a side project of mine. Use this as your SMTP server in a test environment to guarantee that your users don't receive test emails. Looking for feedback, especially on the security side.

   2024 · fakemail.stream · its alternatives →

10. 10
    Mocking Bird▲70

    Auto Reply Email Generator

    2023 · its alternatives →

11. 11
    Mailtrap.io▲125

    Fake SMTP. Send Test Emails without spamming real customers

    2014 · its alternatives →

12. 12
    TestSubject▲133

    Test how your email subject line displays on mobile devices.

    2016 · its alternatives →

13. 13
    MailSlurp▲103

    End-to-end email testing made easy

    2018 · its alternatives →

14. 14
    Paw 2▲82

    The missing HTTP & REST API Tester for Mac

    2014 · its alternatives →

15. 15
    Mocksy▲2

    Mock API endpoints locally on macOS

    Dec 2025 · mocksy.zaltysworks.com · its alternatives →

16. 16MM
    Mockoon – mock REST APIs in seconds▲68

    2017 · mockoon.com · its alternatives →

17. 17
    Redkix Beta▲121

    Team messaging powered by email.

    2017 · its alternatives →

18. 18
    WMail▲115

    OSX App for Google Inbox and Gmail

    2016 · its alternatives →

19. 19
    Mailnest▲100

    Sandbox Email testing tool for IT product, service companies

    2020 · its alternatives →

20. 20
    Airmail▲93

    Lightning fast mail client for OS X

    2013 · its alternatives →

21. 21
    Mock Maker▲93

    Effortless mock APIs for seamless testing & prototyping

    2024 · its alternatives →

22. 22
    MockingBot▲82

    A rapid prototyping, design collaboration and handoff tool

    2018 · its alternatives →

23. 23
    MockAPI Dog▲122

    Instant mock REST & LLM APIs - free, no signup required

    Feb 2026 · mockapi.dog · its alternatives →

24. 24HA
    HTTPretty, an easy way to mock http requests in python▲97

    2012 · falcao.it · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →