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Alternatives

Products that do what Apicat – A Lightweight Offline Postman Alternative does

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.

  1. 1RO

    Last time I posted this it didn't garner much interest. There have been lots of improvements and fixes since the last release. Quick list of features: - Workspaces - Tabs - Nested Folders - Lots of context menus - Response history - Plugins - Runs fully in the browser and runs offline if necessary - Chrome and Firefox extension to bypass CORS restrictions - Desktop builds for all platforms - GraphQL support - Import collections exported from Postman and Insomnia - Simple user friendly interface I built this because I love Insomnia but wanted a portable version that I could run in the…

    2022 · restfox.dev

  2. 2
    Postman182

    Postman is a powerful HTTP client to test REST API

    2014

  3. 3

    Build, test, and document your APIs faster

    2016

  4. 4
    Apidog571

    All-in-one collaborative API development platform

    2024

  5. 5

    Develop APIs fast + automatically detect endpoints

    2025

  6. 6NW
  7. 7
    APIsList293

    The updated list of the public APIs

    2022

  8. 8
    ApiHome73

    Home of API testing

    2022

  9. 9

    Offline, open-source API client. Your data never leaves.

    Jul 2026 · testnizer.com

  10. 10
    Sparrow331

    The Open Source API Testing Tool For All Developers

    2024

  11. 11YA

    Hi HN! I'm Greg and I've been working on Yaak for just over a year. I usually describe it as a Postman alternative since most developers are familiar with that, but it's targeted more toward users that just want an API client (no mocking, testing, spec design, etc). Having also created Insomnia for a similar purpose, I never thought I'd build another API client again. But, after selling Insomnia in 2019 and watching it expand into the broader feature set of Postman, I was left wanting a simpler tool again. Yaak was my answer to that. It's hard to describe how it's better than the 100 other…

    2025 · yaak.app

  12. 12CW

    Hey HN, This is Jan, founder of Apify, a web scraping and automation platform. Drawing on our team's years of experience, today we're launching Crawlee [1], the web scraping and browser automation library for Node.js that's designed for the fastest development and maximum reliability in production. For details, see the short video [2] or read the announcement blog post [3]. Main features: - Supports headless browsers with Playwright or Puppeteer - Supports raw HTTP crawling with Cheerio or JSDOM - Automated parallelization and scaling of crawlers for best performance - Avoids blocking using…

    2022 · crawlee.dev

  13. 13LO

    2017 · postmancollections.com

  14. 14PV

    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

  15. 15PA

    2023 · github.com

  16. 16

    Test public APIs with one click

    2016

  17. 17
    Octrafic130

    Test your APIs in plain English, straight from the terminal

    Mar 2026

  18. 18

    postman alternative, API Testing tool, API Platform, apipeek

    May 2026 · apipeek.app

  19. 19

    A Postman collection for working with the Messenger Platform

    2017

  20. 20

    An open benchmark for AI agents that test APIs

    May 2026 · resources.kusho.ai

  21. 21AH
  22. 22VA

    Hi HN, We have open-sourced Voiden. Most API tools are built like platforms. They are heavy because they optimize for accounts, sync, and abstraction - not for simple, local API work. Voiden treats API tooling as files. It’s an offline-first, Git-native API tool built on Markdown, where specs, tests, and docs live together as executable Markdown in your repo. Git is the source of truth. No cloud. No syncing. No accounts. No telemetry.Just Markdown, Git, hotkeys, and your damn specs. Voiden is extensible via plugins (including gRPC and WSS). Repo:…

    Feb 2026 · github.com

  23. 23SA
  24. 24
    Xplorer103

    A Secure, 100% Local API Client

    Nov 2025

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