Fat-Free vs Lumen: What are the differences?

Fat-Free: PHP micro-framework designed to help you build dynamic and robust Web applications - fast. Fat-Free Framework makes it easy to build entire Web sites in a jiffy. With the same power and brevity as modern Javascript toolkits and libraries, F3 helps you write better-looking and more reliable PHP programs; Lumen: The stunningly fast PHP micro-framework by Laravel. Laravel Lumen is a stunningly fast PHP micro-framework for building web applications with expressive, elegant syntax. We believe development must be an enjoyable, creative experience to be truly fulfilling. Lumen attempts to take the pain out of development by easing common tasks used in the majority of web projects, such as routing, database abstraction, queueing, and caching.

Fat-Free belongs to "Frameworks (Full Stack)" category of the tech stack, while Lumen can be primarily classified under "Microframeworks (Backend)".

"Open source" is the primary reason why developers consider Fat-Free over the competitors, whereas "API" was stated as the key factor in picking Lumen.

Fat-Free and Lumen are both open source tools. It seems that Lumen with 6.31K GitHub stars and 836 forks on GitHub has more adoption than Fat-Free with 2.3K GitHub stars and 443 GitHub forks.