Cost / License
- Free
- Open Source
Platforms
- Linux
- Flathub
- Flatpak

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 HTTP Toolkit.

Main goal of this VSCode extension is storing all HTTP request & response data automatically as files in a VSCode workspace.

Wisdom rest-client is a tool supports automated testing REST API, producing exquisite report, and generating exquisite REST API documentation based on historical cases.




Send HTTP requests to API endpoints. GetIt's main focus is to make your life a lot easier when you have to test APIs or use somebody else's API.




Talend API Tester makes it easy to invoke, discover and test HTTP and REST APIs.




API test automation tool that has GUI, supports HTTP stubs (mock services), data driven testing, and API types beyond HTTP, such as relational database, JMS, FTP(s), AMQP, MQTT, etc.
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.

Resonance is a clean and minimal API client application designed to provide an excellent user experience for testing and interacting with APIs. Built with Electron, it offers a modern and intuitive interface for developers.

EchoAPI is an all-in-one API development collaboration platform that offers essential features like API debugging, design, automated testing, stress testing, and documentation generation.
APITree is a free cloud-based API tool to create, manage and share OpenAPI specifications. It converts your OpenApi v2 / v3 specification into a beautiful technical API documentation. Public API documentation is hosted for free.
HTTP API testing tool where you can create requests and mock existing API:s. After trial has expired you can still create requests.




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.

