Top Free API Development Tools for Developers

• Karate

  27 8,352 7.7 Java

  Test Automation Made Simple

  

  Link: Karate DSL

• CodeRabbit

  coderabbit.ai featured

  CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.

  

• thunder-client-support

  17 3,640 7.7

  Thunder Client is a lightweight Rest API Client Extension for VS Code.

  

  Link: Thunder Client

• redoc

  38 23,742 7.6 TypeScript

  📘 OpenAPI/Swagger-generated API Reference Documentation

  

  Link: Redoc

• soapui

  22 1,583 5.3 Java

  SoapUI is a free and open source cross-platform functional testing solution for APIs and web services.

  

  Link: SoapUI

• Newman

  302 6,908 7.3 JavaScript

  Newman is a command-line collection runner for Postman

  

  Link: Postman

• insomnia

  240 35,117 9.8 JavaScript

  The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

  

  Link: Insomnia

• httpie

  128 34,156 6.8 Python

  🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more. (by httpie)

  

  Link: HTTPie

• SaaSHub

  www.saashub.com featured

  SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

  

• Hoppscotch

  228 66,035 9.6 TypeScript

  Open source API development ecosystem.

  

  Link: Hoppscotch

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