Not sure, I used the website maybe 3 years ago to quit smoking though.

If you mean a mobile app, there's a Don't Break The Chain[1] iPhone app that I use on/off. It's free with a premium version with no ads at $5.

There's apparently an Android app out there[2] as well.

[1] http://itunes.apple.com/us/app/dont-break-the-chain!/id31356...

[2] https://market.android.com/details?id=com.geolinx.android.do...

Yep, Unbroken Chain ( http://itunes.apple.com/us/app/unbroken-chain/id415158247?mt... )

I released it in January just thought it would be interesting to see the usage stats, I haven't checked in forever!

Goals Added: 17,642 Chains Added: 247,104

Kind of cool to see actual usage from someone other than me!

# of goals added is pretty obvious, but # of chains added probably bears a little explanation: Every day you do something is a chain - I probably should have called it a link in the stats system.

"Streaks" for iOS: http://itunes.apple.com/us/app/streaks-motivational-calendar...