Productivity Tracking!

So I’ve got this big cork bulletin board. It’s covered with index cards representing To-Do items, and also books in progress. Underneath the book titles are long columns of colored pins. Each pin represents 1000 words. When I write those 1000 words, the colored pin is replaced with a wooden pin. When all of the colored pins have been replaced by��wooden pins, the book is done!

The cork board isn’t going anywhere, but I spent a little bit of time this weekend researching iPhone apps that allow OCD tracking of writing productivity. Any suggestions?