MusicToMusic is a free iPhone application developed by Carlo Maria Battistini. It falls under the category of Multimedia, specifically Music & Radio. With MusicToMusic, users can transfer music playlists between Apple Music and Spotify in a fast, accurate, and completely automated way.

The main features of MusicToMusic include the ability to connect an unlimited number of Apple Music and Spotify accounts, transfer multiple playlists at once, and experience fast transfers with only 1 minute required to transfer 100 songs. The app also offers automatic account synchronization between all your iPhones, iPads, and Macs, making it convenient for users with multiple devices. A universal in-app purchase allows users to buy once on any device and unlock the full version on all their iPhones, iPads, and Macs. MusicToMusic is also free from ads or junk notifications and provides a time remaining indicator for transfers. Additionally, the app offers a missing songs report, allowing users to review the list of songs that couldn't be transferred due to unavailability on the destination service.

The free version of MusicToMusic allows users to sample the performance and accuracy of the app by transferring a set of featured playlists to any of their music accounts. To transfer their own playlists, a small in-app purchase is required. It's important to note that MusicToMusic requires access to the user's music library and restricted Apple Music accounts, such as those for kids under 13 years of age, cannot be used.

Overall, MusicToMusic provides a convenient solution for users who want to transfer music playlists between Apple Music and Spotify. With its fast and automated transfers, users can easily enjoy their favorite playlists on both platforms.