Sencha.cmd is the extraordinary tool to work with all Sencha products.

Extapp is about something different. It's light-weight stand-alone alternative of JS Compiler in Sencha cmd. It is flexible to include/exclude both native 'Ext' sources and other classes. It is working in non-conflict way and
deployment friendly.

That's much more easy to integrate 400Kb jar file into ant/gradle deployment scripts than install and setup Sencha software package. I was tired to set it up so I decided to write my own "bicycle".