KATALOG is a Mac music library manager for people who own their music: the unreleased, the out of print, the promos and the edits that streaming was never going to hold. It opens a 100,000-track library in under a second, decodes FLAC natively, and writes artwork, lyrics, tags, tempo and cues into the files themselves, so your work survives the next app and the next machine. Nothing is moved, renamed or re-encoded. It syncs both ways with Apple Music, carrying your stars, loved tracks, play counts and playlists across, and reads and writes Serato crates and cues. Sort three levels deep, ask for what you want in plain English, and find duplicates and missing files. One library, four layouts: Play, Prep, Studio and Desk, and every panel can be switched off. All the basic features are free: library, playlists, search, playback and editing tags. The full version is free to try for 30 days, and a $30 one-time licence unlocks the extras. No cloud, no account, no subscription.