On **Github** "CoolReader" is used:  **F-Droid** and **[Google Play](https://play.google.com/store/apps/details?id=org.coolreader)** — "Cool Reader":  [Sourceforge](https://sourceforge.net/projects/crengine/) — "CoolReader" and "Cool Reader":  I suggest choosing the final version of the name of the application, and use only it everywhere.