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Don't do it too often though - I hate thirsty apps begging for reviews.

I just say Yes, I will review and go to the play store and go right back. Do you know whether I left a review?

The API doesn't let you do it more than once.

Interesting. I know some Android apps do it multiple times.

There's no official API for Android, so you can request whenever you want. iOS added this functionality to limit review requests from apps.

The limit on iOS is 3 times per year.