What is the lit app?

Excuse me, but could you please elaborate on what you mean by "the lit app"? Is this a specific application related to literature, or perhaps it's a term used in a different context that I'm not familiar with? I'm curious to know if it's a tool for reading, analyzing, or discussing literary works. Could you provide more information about its functions and features? Additionally, is it available for download on popular app stores, and if so, what are the user reviews like?