Supported games are ace play, color wenz, wenz, and solo. Color wenz and wenz are optional, Additional options are doubling after getting our cards and challenges (contra, re, ...) The app knows and uses the traditional Schafkopf conventions e.g. playing a high trump if the player has the called ace.
The starter edition of the app includes advertisements and has functional restrictions. You can upgrade to the starter edition without advertisements or to the premium edition. The premium edition is free of advertisements, has all options including a training mode in which the player sees the computer proposal for the game or cards to choose. This helps beginners to improve their playing skills quickly.
For an English description of the Schafkopf rules see http://www.schafkopfschule.de/index.ph/regeln.html