Apps with 'API Testing' feature

Katalon Studio is a free and robust automation solution for API, Web and Mobile testing. It eliminates the complexities of building an automation framework by integrating all necessary test components with built-in keywords and project templates.

Thunder Client is a hand-crafted lightweight Http Client extension for Visual Studio Code. No separate download needed, Just install the extension from VS Code marketplace.

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.

k6 is a developer centric, open source load testing tool, built to integrate with your Continuous Integration tools, so you can stay on top of performance without fuzz. Powered by Load Impact. k6 test scripts are written in ES6 JavaScript to allow creation of modular scripts.

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.

Support Digital Businesses in accelerating their software delivery with automated functional testing at scale. Enabling collaboration being low-code and covering the full continuous testing lifecycles.

Apibucket is best way your api documentation. Easily manage your team and fast release your api document.

Loadmill helps developers easily create the tests required for continuous delivery by analyzing user behavior. Loadmill automates backend regression testing by replaying real user behavior.

An online tool to test Api endpoints.

Conektto's API lifecycle fabric is the world's first SAAS based visual designer for API that generates spec, mocks, visualization, code, test and test data automatically.

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.

Functionize combines natural language processing, deep-learning ML models and other AI-based technologies to empower your team to build tests faster that don’t break and run at scale in the cloud.

RestControl is modern and powerful framework for testing REST services. RestControl provides set of tools for describing HTTP requests and responses in expressive and elegant way.

Pororoca is a HTTP testing tool, inspired by Postman, but with many improvements.

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.