When I was studying for the GMAT I was annoyed to learn that there were no GMAT test prep apps available. John let me know that Crimson Oak Academy has just rectified this situation by releasing their own GMAT Test Prep app and is currently offering the app for free for a limited time!
The app includes over 250 MBA questions with custom timed GMAT practice quizzes. I am not sure how you would solve a data sufficiency problem without some scratch paper but its still better than lugging around that huge yellow GMAT bible. The app also provides you with scoring strategies in a nice clean cut interface. Crimson Oak Academy also added some collaboration with Facebook and a forum built in for quick questions.
Check out the app now at www.crimsonoakacademy.com