Erudito Keyboard for iPhone (
https://erudito.io) It's a mini game in an iPhone keyboard, you play from any App, just by writing.
Common words give you little or no points, infrequent words give you points. You get bonus points when you write a sequence of words with points.
There is a leaderboard where you can compare your "skills" against other users and friends. Still need to implement a feature to segregate each leaderboard: general and friends.
The keyboard has realtime notifications and bidirectional communication with websockets, so you can know what other users are doing, this will be useful to have "death matches".
As you can see It's an experimental App. Currently is available on the Appstore (since last week) but I didn't promote it yet, I'm looking for users to iterate it more :) and crush few bugs along the way.