



Thunder Client is described as 'Hand-crafted lightweight Http Client extension for Visual Studio Code. No separate download needed, Just install the extension from VS Code marketplace' and is a API Client in the development category. There are more than 50 alternatives to Thunder Client for a variety of platforms, including Mac, Windows, Linux, Web-based and Google Chrome apps. The best Thunder Client alternative is Bruno, which is both free and Open Source. Other great apps like Thunder Client are Postman, Insomnia REST Client, Yaak and Hoppscotch.




Kreya is a GUI client for gRPC, REST and WebSocket APIs with innovative features for environments, authorizations and more.




Milkman is a JavaFx-based workbench for crafting requests / responses. It is not limited to e.g. http (or more specifically rest) requests but can be extended in any imaginable way. It is optimized for fast startup and efficient workflow.


Used httpyac CLI tool underneath, which helps you execute _.http and _.rest files. This can be used to quickly execute a single *.http file, but also to execute all files in a folder. httpyac supports HTTP, Rest, GraphQL, WebSocket und gRPC...


The Zero Trust API Client - A Secure & Free Alternative to Postman , Insomnia & Thunder Client.




This is a tool to manually explore and test HTTP REST webservices. Runs queries from a plain-text query sheet, displays results as a pretty-printed XML, JSON and even images.

Httpiness is aimed to be a simple, straightforward HTTP client which minimizes time to configure, send, reconfigure and resend requests in order to maximize development efficiency.


RESTClient can be used to test variety of HTTP communications and RESTful webservices. Friendly GUI, rich functionalities.






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.



