Cost / License
- Free
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Google Chrome
- Firefox



RequesterX is described as 'Free desktop HTTP client for API testing and development. Organize requests into nested collections, use environment variables for easy context switching, generate code snippets in 13 languages, and keep everything stored locally — no account required' and is a API Client in the development category. There are more than 50 alternatives to RequesterX for a variety of platforms, including Mac, Windows, Linux, Web-based and Flathub apps. The best RequesterX alternative is Bruno, which is both free and Open Source. Other great apps like RequesterX are Postman, Insomnia REST Client, Yaak and Hoppscotch.



Design and debug APIs in a powerful visual editor. Describe and debug easily with JSON Schema support. Apidog is a complete set of tools that connects the entire API lifecycle, helping R&D teams implement best practices for API Design-first development.




HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and first class support for testing.




apiman is an open source API management layer that streamlines repetitive tasks often required when providing an API, such as implementing security, throttling and billing.
API Test Base is a free tool for integration testing a variety of APIs. It is suitable for Integration, ESB and Microservices testing.


Lama2 defines the human-friendly l2 syntax and CLI for describing and executing APIs. Store your APIs in plain-text files. Collaborate with team using version control (say, git). Run Lama2 directly from VSCode extension. Think of Lama2 as Markdown for APIs.


The API Astrolab enables today’s API-first companies to show their API products in a visual way so that anyone can understand how they work.



RestCase is a security-focused API development platform that enables its users to rapidly create secure microservices, mock them in order to start testing, monitor APIs and collaborate on their development and testing.


Powerful IDE to work with API. Harness the power of scenarios, autocompletion and syntax highlight for API development. Write tests, share code without leaving the comfortable development environment.




Gotcha HTTP Client is a lightweight http client that allows you to make requests and inspect responses.




API integration platform for testing, prototyping, and running of any API flow. The right tool for successful API flow integration - nice, easy, simple, and cheap.


Humlix shows you an easy way of generating tests for your web APIs. All you need to do is create a test request using the test request builder within Humlix and give an example of how your endpoints look and what type of data they want.
