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Best Open-Source API Testing Tools in 2026

5 of the 6 API testing tools ranked on listme.name match: their source code is public under an open-source license. The order uses the same scores as the full ranking.

5 products ranked Updated October 2026 How we rank

The ranking

  1. 1

    Bruno

    Free and MIT-licensed, with collections stored as Git-friendly files and no cloud sync needed. Team features need Pro at $6 per user a month, and it has fewer hosted collaboration features than Postman.

    Best for Git-based API collections

    WindowsmacOSLinuxCommand lineFree plan, paid upgradesOpen source

    90.0of 100
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  2. 2

    Insomnia

    A Kong-maintained client with a free local Scratch Pad, Git Sync for small teams and Apache-2.0 source. Team pricing is per user, with Pro at $12 and Enterprise at $45 per user a month.

    Best for Commercial client with Git Sync

    macOSWindowsLinuxFree plan, paid upgradesOpen source

    88.0of 100
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  3. 3

    Hoppscotch

    MIT-licensed, with web, desktop and CLI versions and self-hosting on your own servers. Self-hosting adds server upkeep, while the web and desktop apps need no setup.

    Best for Self-hosted open-source API testing

    WebWindowsmacOSLinuxCommand lineSelf-hostedFree and open sourceOpen source

    87.0of 100
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  4. 4

    Yaak

    A local-first desktop client that stores requests as YAML files for Git. It is free for personal use and MIT-licensed, while work use needs a paid license, and its ecosystem is smaller than Postman's.

    Best for Local-first desktop client with Git files

    LinuxmacOSWindowsCommand lineFree plan, paid upgradesOpen source

    85.0of 100
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  5. 5

    HTTPie

    An open-source BSD-3-Clause terminal client with readable output, plus a desktop app that is still in public beta. It suits people who work mainly in the terminal.

    Best for Terminal-first HTTP testing

    Command lineWebWindowsmacOSLinuxFree and open sourceOpen source

    79.5of 100
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At a glance

ProductScorePricePlatformsCollections stored
Bruno90.0Free plan, paid upgradesWindowsmacOSLinuxCommand lineGit-friendly files on disk
Insomnia88.0Free plan, paid upgradesmacOSWindowsLinuxLocal, with optional Git Sync or cloud
Hoppscotch87.0Free and open sourceWebWindowsmacOSLinuxCommand lineSelf-hostedBrowser, desktop or self-hosted server
Yaak85.0Free plan, paid upgradesLinuxmacOSWindowsCommand lineYAML files in your project
HTTPie79.5Free and open sourceCommand lineWebWindowsmacOSLinuxLocal terminal or desktop app