Stack Master is a stack training application. To learn a stack, best option from my perspective, are the flash cards. There are some awesome flash cards applications but I wanted something "stack oriented", easy and fun, that runs on my mobile phone ; a simple mobile application that analyzes my weaknesses and "trains" me accordingly, remembering my "weak cards" and my learning curve. Stack Master offers you to study your stack without pain, using 7 clever training modes and 15 funny challenges. Stack Master supports multiple stacks (Mnemonica, Aronson, Osterlind, Redford, Si-stebbins, Rix...) and you can add and create custom ones, directly from the application. You can even publish your score challenges and compare them with those of your friends!