Mockoon vs Sinon.js: licensing, GitHub activity, and what each is actually for. Neutral comparison, no paid rankings.
Mockoon: Open source. 8,439 GitHub stars. Desktop app, CLI, and Docker image for creating local mock REST APIs with customizable routes and dynamic responses, no account or remote deployment required.
Sinon.js: Open source. 9,754 GitHub stars. Standalone test spies, stubs, and mocks for JavaScript. Works with any unit testing framework.