UniRate - A better drop-in solution for rating mobile apps
UniRate is a Unity package to help you promote you mobile games by prompting users to rate the app after using it for a few days or times. Integrating UniRate to your project is deadly simple as a drag & drop, but it is powerful and configurable for some advanced usage. It will count the using of the times and days automatically and if the conditions you set are met, a native prompt will pop up and user can decide whether rate it or not.
This approach is one of the best ways to get positive app reviews by targeting only regular users (who presumably like the game or they wouldn't keep playing it).
For more information, please visit http://unirate.onevcat.com
You can download this unity package to import and use it in your project. All update will be delivered free as soon as it comes out.