glCoin is a special app to determine how often heads will appear and how often tails will appear. It’s an easy and fun way to verify the Theory of Probability. You flip a coin and the app transmits your results to the Heads or Tails? project. Check the project Findings page and the results from all over the world. Presently, it looks like heads are winning!

glCoin for Android is downloadable here

And yes, it’s free!