Postman is a comprehensive app that allows you to design, test, and document APIs.
You will be able to create APIs directly in Postman as well as manage all of your organization's APIs. The whole process is made simple with Postman's API schema support, version control, and tagging.
Postman's UI is set up to make the process of thoroughly testing, documenting, and sharing APIs almost as efficient as possible for any skill level of user. The interface also includes two themes that allow you to choose your work environment; one for use in a well-lit office setting and the other for low light conditions when burning the midnight oil.
Postman will be essential for users performing integration work between systems, backend/frontend programmers by offering an efficient option for testing out mobile app compatible APIs, etc.
Powerful, simple to use GUI
Saved history of API requests
Unlimited collections, environments, tests, and sharing
Automated testing with collection runner
Web-viewable, detailed API documentation
Flexible API monitoring, for uptime, performance, and accuracy
Mock servers, to support split-stack development
The free version is perfect for small projects with a complete API Development environment. Plans start at $8.00 per month and further include professional collaboration features and full access to extended features like automated testing, API monitoring, etc., geared for power users and development teams.