Rovio expects $1m per month from F2P Angry Birds

Angry Birds developer Rovio has projected monthly revenues of over $1 million from the free to play version of its catapult game.

While the iPhone version of Angry Birds carries a charge and is published by Chillingo, the Android port is self-published and free, but ad-supported.

The game has enjoyed over five million downloads via the Android Market. "By end of year, we project earnings of over $1 million per month with the ad-supported version of Angry Birds," Rovio boss Peter Vesterbacka told TechCrunch.

Vesterbacka also claimed that the Angry Birds series has an 80 per cent retention rate, as revealed by the propoprtion of players who download updates.

On iOS, the series has recently been expanded by self-published Halloween and Christmas-themed modifications.