Lumen vs Slim Lang: What are the differences?

What is 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.

What is Slim Lang? Template language whose goal is reduce the syntax to the essential parts without becoming cryptic. Slim is a template language whose goal is to reduce the view syntax to the essential parts without becoming cryptic. It started as an exercise to see how much could be removed from a standard html template (<, >, closing tags, etc...). As more people took an interest in Slim, the functionality grew and so did the flexibility of the syntax.

Lumen can be classified as a tool in the "Microframeworks (Backend)" category, while Slim Lang is grouped under "Templating Languages & Extensions".

"API" is the primary reason why developers consider Lumen over the competitors, whereas "Easier to type and maintain than haml" was stated as the key factor in picking Slim Lang.

Lumen and Slim Lang are both open source tools. It seems that Lumen with 6.31K GitHub stars and 836 forks on GitHub has more adoption than Slim Lang with 4.84K GitHub stars and 473 GitHub forks.