Top 11AI made for AI

Free developer tools · quality engineering in the Top 11

10 providers in the Top 11 The 11 Best API Testing Tools (2026) offer a free tier; the most credible is Postman.

Why this answer

Filtered to entries with a published free tier (not just a free trial). When the pricing page is ambiguous we err conservative — paid-only by default.

Showing all 10 matches. Top 11 publishes whatever the data supports — we don’t pad lists. See the full ranked The 11 Best API Testing Tools (2026).

  1. #1Postman(rank #1 in The 11 Best API Testing Tools (2026))

    Free tier

    The most complete option for teams that need authoring, automation, and CI in one place.

    Full Postman review · Compare: Postman vs Bruno · Alternatives

  2. #2Bruno(rank #2 in The 11 Best API Testing Tools (2026))

    Free tier

    The git-first choice that keeps API tests in your repo, not a vendor cloud.

    Full Bruno review · Alternatives

  3. #3Insomnia(rank #3 in The 11 Best API Testing Tools (2026))

    Free tier

    A clean, fast client with excellent GraphQL and gRPC handling.

    Full Insomnia review · Alternatives

  4. #4Apidog(rank #4 in The 11 Best API Testing Tools (2026))

    Free tier

    An all-in-one that folds design, mocking, and testing together.

    Full Apidog review · Alternatives

  5. #5SoapUI(rank #5 in The 11 Best API Testing Tools (2026))

    Free tier

    The default when SOAP and legacy enterprise services are in scope.

    Full SoapUI review · Alternatives

  6. #6Katalon(rank #6 in The 11 Best API Testing Tools (2026))

    Free tier

    One platform for API, web, and mobile test automation.

    Full Katalon review · Alternatives

  7. #7Testsigma(rank #7 in The 11 Best API Testing Tools (2026))

    Free tier

    Plain-English test authoring with an open-source edition.

    Full Testsigma review · Alternatives

  8. #8Hoppscotch(rank #8 in The 11 Best API Testing Tools (2026))

    Free tier

    The instant-loading, self-hostable open-source client.

    Full Hoppscotch review · Alternatives

  9. #9Karate(rank #9 in The 11 Best API Testing Tools (2026))

    Free tier

    One readable syntax for API, contract, and load tests in code.

    Full Karate review · Alternatives

  10. #10Keploy(rank #11 in The 11 Best API Testing Tools (2026))

    Free tier

    Turns recorded traffic into tests and mocks automatically.

    Full Keploy review · Alternatives

Methodology: /methodology · No paid placement ever · Verified .