Repress

A professional DJ’s library lives on USB sticks in the Pioneer rekordbox database format, and a stick can fail an hour before a set. Repress clones a USB to the phone, keeps the clone safe, and writes it back to a blank stick when needed. A 64 GB library clones in five minutes.

Between backups the app is a library: the whole catalogue browsable by genre, artist or album, with playlists and a player. It is a native app built on iOS 26 Liquid Glass, so the interface is the system’s own, and performance testing was part of the design rather than a phase after it.