Mockoon is the easiest and quickest way to design and run mock REST APIs.

RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

Easy-to-use website monitoring and uptime monitoring service in one

Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

Professional software tool for HTTP testing and debugging

Design, debug, and test APIs locally or in the cloud