Best software in android?

I found that the best software in Android is the following:

Perfect Chess Trainer (PCT) which is a program which covers all the possible needs a chess player will ever have.

Inside the program there are two main fields, one is training composed by:

Guess the move games (with most of the greatest players in history, and a collection of 100 games for each of them)

Train tactics (the program comes with more than 4000 tactics, and adapt on the user, but you can use your own PGN collections)

Train Blunders (where the program examine your games, and propose some exercises

Train openings, Train positions (for the endgames and middlegames), Memorize games (to use the GM Ram system).

and then there is the "study" part with a PGN viewer (for reading ebooks in PGN format) plus lectures, and opening explorer.

I believe PCT is the best software on the market.