Soundiiz offers similar features to Songshift (iOS only) but also provides a Web Application or an Android Application:
- Convert playlists and also favorite lists (Albums, Songs, and Artists)
- Available for many more platforms (over 45 music services)
- Background running process (no need to keep your device ON / Open)
- Tools to manage your music library in one interface
- Advanced Synchronization feature and Smartlink support
- And many other great things are to be discovered!