Personal MTG Counter is an application that allows you to take control of your and your opponent's life, as well as poison, energy and other counters.

Allows you to lock your device's screen to prevent it from turning off during gameplay.

It incorporates a card search engine called "Library", where you can see the official text of the cards as well as the approximate price on the second-hand market and the legality in different formats.

The app allows you to roll dice and customize the appearance to suit your play style. It's completely free, ad-free and open source.