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Best API testing tool for developers

3 models · updated 2026-06-29

The verdict

Bruno leads — All 3 models rank Bruno the top startup.

Combined ranking

  1. 1
    Bruno—13 pts
    GPT #2Claude #2Gemini #1· Git-friendly open-source API client storing collections locally as plain text.
  2. 2
    Hoppscotch—7 pts
    GPT #4Claude #4Gemini #3· Lightweight and web-based open-source alternative for quick API requests.
  3. 3
    Apidog—1 pts
    GPT #5Claude —Gemini —· Strong integrated design, testing, mocking, and documentation workflow.
  4. 4
    Karate—1 pts
    GPT —Claude #5Gemini —· Code-driven framework combining API test automation, assertions, and mocking in readable Gherkin syntax.
  5. 5
    Karate DSL—1 pts
    GPT —Claude —Gemini #5· Unified framework that integrates API automation, mocking, and performance tests.

Not ranked (incumbents): Postman, Insomnia, REST Assured

By model

ChatGPT

  1. 1.Postman
  2. 2.Bruno
  3. 3.Insomnia
  4. 4.Hoppscotch
  5. 5.Apidog

Claude

  1. 1.Postman
  2. 2.Bruno
  3. 3.Insomnia
  4. 4.Hoppscotch
  5. 5.Karate

Gemini

  1. 1.Bruno
  2. 2.Postman
  3. 3.Hoppscotch
  4. 4.REST Assured
  5. 5.Karate DSL

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously