Radical.FM is a digital music streaming service available on iOS devices with plans to expand to Android devices. The service allows users to create their own custom online radio stations. Unlike other streaming services like Spotify and Pandora, Radical.FM is completely free and based on donations through a "pay-what-you-can" model. The mobile application does not show ads or charge subscription fees. 
Radical.FM claims the service relies on human curation for its radio stations.
The company plans to release the service on Android in 2013.