Now every time the user launches your app, Appirater will see if they’ve used the app for 30 days and launched it at least 15 times. If they have, they’ll be asked to rate the app, and then be taken to your app’s review page in the App Store. If you release a new version of your app, Appirater will again wait until the new version has been used 15 times for 30 days and then prompt the user again for another review. Optionally, you can adjust the days to wait and the launch number by changing DAYS_UNTIL_PROMPT and LAUNCHES_UNTIL_PROMPT in Appirater.h.
via Arash Payan – Presenting, Appirater. Pretty useful piece of software for iOS developers.