The service allows users to create their own custom online radio stations based on musical genres.
Unlike other streaming services like Spotify and Pandora Radio, Radical.FM is completely free and based on donations through a "pay-what-you-can" model.
[1][2][3][4] Radical.FM was founded by Thomas McAlevey, who previously launched the radio station Bandit Rock and the website Tomsradio.com.
The service was released on iTunes in August, 2013, and on Android in June, 2014 with a catalog of over 25 million tracks.
[1][2][3][4] Radical.FM claims the service relies on human curation for its genres that are used to build "the best personalized radio stations in the world."