Dev tools · alternatives · 2026

24 alternatives to Postcat

A powerful open source, cross-platform API development tool.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Postcat launched in 2024; newer entries below may have overtaken it.

1. 1
   Apidog▲570

   Development teams often struggle with using multiple tools like Postman and Swagger for API design, development, and testing. This fragmented approach leads to outdated API specs and chaotic collaboration. So we built Apidog: a single, unified API platform for team collaboration. It has a beautiful interface that makes it easy to create API spec, generate request data from API spec, validate responses, create mock data, orchestrate test scenarios, and publish API documentation. Apidog = Postman + Swagger + Mock + JMeter.

   2024 · apidog.com · its alternatives →

2. 2
   Postman for Mac (Beta)▲372

   Build, test, and document your APIs faster

   2016 · postman.com · its alternatives →

3. 3
   Postman▲182

   Postman is a powerful HTTP client to test REST API

   2014 · postman.com · its alternatives →

4. 4
   Library of API collections for Postman▲77

   Accelerate API development with Postman's all-in-one platform. Streamline collaboration and simplify the API lifecycle for faster, better results. Learn more.

   2017 · postmancollections.com · its alternatives →

5. 5IC
   I created Postwoman, an online, open-source API request builder▲280

   Postwoman 👽 - API request builder https://liyasthomas.github.io/postwoman Feel free to contribute on GitHub 💚 https://github.com/liyasthomas/postwoman...

   2019 · indiehackers.com · its alternatives →

6. 6
   Apicat – A Lightweight Offline Postman Alternative▲13

   Apicat is the ultimate offline Postman alternative that stores your .http files locally. It’s Git-friendly, open-source, and highly compatible with Postman. Test APIs offline with this powerful free offline API client designed for developers who need a reliable local API testing tool.

   2025 · apicat.com · its alternatives →

7. 7
   Sparrow▲456

   The lightest and fastest platform for API testing

   2025 · sparrowapp.dev · its alternatives →

8. 8
   PostHog▲458

   An all-in-one product analytics suite you can self-host

   2021 · posthog.com · its alternatives →

9. 9
   Public APIs▲641

   Find public APIs and start building projects and share them.

   2019 · public-apis.io · its alternatives →

10. 10
    Cursor for your API▲473

    Generate, edit, lint & test your API workflow in one place

    2025 · app.getelva.ai · its alternatives →

11. 11
    Postkit▲74

    Effortlessly create API endpoints in the browser

    2018 · its alternatives →

12. 12
    OpenAPI DevTools – Chrome extension that generates an API spec▲811

    Effortlessly discover API behaviour with a Chrome extension that automatically generates OpenAPI specifications in real time for any app or website.

    2023 · github.com · its alternatives →

13. 13
    Paw 3▲336

    The most advanced API tool for Mac

    2016 · its alternatives →

14. 14
    CopyCat▲534

    Build browser automations with AI

    2025 · runcopycat.com · its alternatives →

15. 15
    Postkit 2.0▲129

    Codepen for mock APIs

    2019 · its alternatives →

16. 16
    Apidog Fast Request▲512

    Develop APIs fast + automatically detect endpoints

    2025 · fastrequest.apidog.com · its alternatives →

17. 17
    APIsList▲286

    The updated list of the public APIs

    2022 · apislist.com · its alternatives →

18. 18
    Posting v1 – The modern HTTP client that lives in your terminal▲184

    Hi HN! I just released version 1.0 of Posting, an open source terminal application I've been working on which you might find useful if you work with, test, or develop HTTP APIs! Posting (https://github.com/darrenburns/posting) is an HTTP client, not unlike Postman and Insomnia. However, as a TUI application, it works over SSH and enables efficient keyboard-centric workflows. Your requests are stored locally in simple readable YAML files, meaning they're easy to read and version control. Some other features include: - "Jump mode" navigation - Environments/variables…

    2024 · github.com · its alternatives →

19. 19
    Postmake – A directory of tools and resources for your projects▲197

    2019 · postmake.io · its alternatives →

20. 20
    Postal▲231

    Open source mail delivery platform

    2017 · github.com · its alternatives →

21. 21
    Tracecat – Open-source security alert automation / SOAR alternative▲264

    Hi HN, we are building Tracecat (https://tracecat.com/), an open source automation platform for security alerts. Tracecat automates the tasks a security analyst has to do when responding to a security alert: e.g. contact victims, investigate security logs, report vulnerability. The average security analyst deals with 100 alerts per day. As soon as an alert comes in, you have to investigate and respond. An average alert takes ~30 minutes to analyze (and 100 x 30 min = 50 hours > one whole day) Lots of things get dropped, and this creates vulnerabilities. Many breaches can be…

    2024 · github.com · its alternatives →

22. 22
    PgCat, Postgres pooler with sharding, load balancing and failover▲233

    PostgreSQL pooler with sharding, load balancing and failover support. - postgresml/pgcat

    2022 · github.com · its alternatives →

23. 23
    ApiHome▲73

    Home of API testing

    2022 · apihome.io · its alternatives →

24. 24
    Run in Postman Button▲106

    Test public APIs with one click

    2016 · postman.com · 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 →