Appp.io - Bird Calls is a free Android app that offers a collection of bird calls sound and ringtones. The app is easy to use and does not require an internet connection to play the sounds.

The app features a simple interface that allows users to play and stop bird sounds randomly. Users can mark their favorite sounds and use the auto replay feature to listen to them repeatedly. Additionally, users can set the sounds as ringtones, notifications, and alarm clocks.

Overall, this app is a great choice for bird enthusiasts who want to enjoy bird calls and use them as ringtones.