I made that site because I couldn't find anything quite like it. Since making it though, I've found Beeminder, which is pretty flipping cool. Additionally, there's EpicWin - but that's only an iPhone app, no website or Android. I'm biased :) (PS, there are few Android equivalents out there, but meh).
There's something wrong in Chrome with the login button. It works on Firefox, but it stays disabled in Chrome. I think I had the same problem when I registered too, and I have to use Firefox. And could you add Google sign-in integration, too?
