Best API testing tool for developers

Combined ranking

1. 1
   Postmanincumbent—14 pts

   GPT #1Claude #1Gemini #2

   Broadest API workflow coverage, strongest team collaboration, huge ecosystem, collections, mock servers, monitors, docs, CLI/Newman automation, governance, and AI-assisted test generation

   To stay #1 Make the core developer experience faster, less cloud-dependent, and more Git-native by default

2. 2
   Bruno—13 pts

   GPT #2Claude #2Gemini #1

   Offline-first, open-source, and Git-native filesystem storage (.bru files) that completely prevents vendor lock-in while offering a familiar, lightweight GUI.

   To rank higher Improve pre-request/test scripting capabilities and NPM package import support to achieve parity with Postman's execution environment.

3. 3
   Insomniaincumbent—7 pts

   GPT #3Claude #4Gemini #4

   Polished API client, strong REST/GraphQL/gRPC support, good environment handling, OpenAPI workflows, plugins, and a smoother day-to-day debugging feel than many rivals

   To rank higher Rebuild developer trust around accounts, sync, licensing, and long-term product direction

4. 4
   Hoppscotch▲15 pts

   GPT #5Claude #3Gemini #5

   Excellent browser-based, keyboard-driven client covering REST, GraphQL, WebSocket, SSE, and MQTT; open source with a self-hostable version, near-zero setup, and a generous free tier

   To rank higher Strengthen automated test scripting and CI tooling so it can be a team's system of record for regression suites, not just an exploration tool

5. 5
   HHurlnew4 pts

   GPT —Claude #5Gemini #3

   Extremely fast, Rust-based CLI tool that uses plain text files to define requests and assertions, making it ideal for Git-centric CI/CD pipelines.

   To rank higher Develop an official, interactive GUI helper or extension to easily construct requests and visualize complex JSON/HTML payloads.

6. 6
   RReadyAPI▼22 pts

   GPT #4Claude —Gemini —

   Deep enterprise-grade API testing, strong assertions, data-driven tests, security testing, load testing, service virtualization, reporting, and SmartBear ecosystem integrations

   To rank higher Modernize the developer UX, pricing, and Git/CI workflow so it feels less heavyweight

Rank history

By model

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