Optic is described as 'Open-source tool that automatically documents and tests your API. It makes it easy to keep your API specification and code in sync and automates your contract testing' and is an app in the development category. There are more than 10 alternatives to Optic for a variety of platforms, including Web-based, Linux, Windows, Mac and Self-Hosted apps. The best Optic alternative is Doxygen, which is both free and Open Source. Other great apps like Optic are CodeRifts, swagger.io, Slate API Docs Generator and Redocly.