radiko is a free Android application developed by 株式会社radiko, designed for users in Japan only. It is a multimedia music and radio app that allows users to listen to live radio stations and music on-demand.

The app features a user-friendly interface that is easy to navigate, and it offers a wide range of radio stations from various genres, including news, sports, music, and talk shows. Users can also access a variety of on-demand content, including popular music and podcasts.

One of the standout features of radiko is its ability to save favorite stations and programs for easy access. Additionally, the app offers a sleep timer function that allows users to listen to their favorite content as they drift off to sleep. Overall, radiko is a great app for those in Japan who are looking for a convenient and easy way to access live radio and on-demand content.