Letter unscrambling apps for Scrabble include Word Unscrambler, Cheater for Words with Friends and Word Breaker, as of 2015. These apps are available either free of charge or for a nominal fee.
The WordUnscrambler app is available for both the iPhone and the Android platform. It has a large dictionary and does not require an Internet connection. Cheater for Words with Friends is available for the iPhone or iPad, and it lets players use wildcard tiles. Word Breaker is available on Google Play. It has a board solver mode and also supports multiple languages such as French, German and Italian.