Counter Pick Mastery for Dota 2, developed by OttenApps, is a free Android application that provides users with a comprehensive guide for counter picking in Dota 2. The app includes various modes, such as draft mode, quiz modes, and a counter picker guide, to help users become master counter pickers.

The draft mode suggests counter picks that will ensure the enemy team is countered while maintaining a balanced team role. Each suggestion comes with clear descriptions of why the hero was suggested and how to use them. Users can also unlock the draft practice mode to test their counter picking skills in a simulated draft and receive detailed feedback and a rating for their draft.

In addition, the quiz modes allow users to test their counter picking knowledge against individual heroes. The counter picker guide provides users with complete and detailed descriptions of countering tactics and abilities for every Dota 2 hero. It is important to note that this app is not created, sponsored, or endorsed by Valve Corporation and usage for this app falls within fair use guidelines.

Overall, Counter Pick Mastery for Dota 2 is a useful tool for Dota 2 players who want to improve their counter picking skills and gain a better understanding of the game.