Acoustic fingerprint matching catches the same recording across formats, bitrates, and tag spellings. Works on any music folder — no DJ software needed.
Most duplicate finders compare by filename or tag, which means a 192 kbps MP3 and a 320 kbps re-encode of the same song look like two completely different tracks. dupeGuru, Gemini, and the generic file-dedup tools all miss this. The actual question — "is this the same recording?" — needs to read the audio, not the metadata. And once you find them, you still need a sensible way to decide which copy to keep without manually opening each file.
Supported today
Rekordbox · Serato DJ · VirtualDJ (incl. Favorite Folders) on Windows 10+ and macOS (Apple Silicon + Intel).
Acoustic fingerprinting is what separates a real duplicate finder from a filename matcher. Chromaprint reads the actual audio waveform and generates a compact hash that's stable across formats — a 320 kbps MP3, a 192 kbps re-encode, and a FLAC of the same recording all produce nearly identical fingerprints. MLD pairs that with a quality-aware scorer so you don't have to manually compare every group; the best copy is highlighted, and the others are queued for Trash with one click. Files go to the system Trash bin, never hard-delete, so anything can be recovered.
No. Folder Library mode is built specifically for users without Rekordbox, Serato, or VirtualDJ. Point MLD at any music folder and the duplicate scanner works the same as it does for DJs.
dupeGuru and Gemini compare by filename, file size, or metadata. They miss duplicates with different filenames or tags, which is the most common case for music collections built over years. MLD uses acoustic fingerprints (Chromaprint) so the same recording matches regardless of how the file is named.
The first pass on a 10,000-track library takes 10–30 minutes (audio decoding is slow). Subsequent scans are cached and instant. You can run the basic filename + metadata pass first if you want quick wins.
MLD never auto-deletes. You select what goes to Trash, and Trash is reversible. The quality-aware scorer recommends the best copy to keep, but the final choice is always yours.
Yes. Add any folder, including paths on USB sticks or external SSDs. Drives that aren't plugged in are silently skipped — no errors.
No. The entire scan happens locally. Audio fingerprints stay on your machine; nothing about your library is sent anywhere.
Free tier covers detection and viewing. Lifetime access is $49 — $19 for the first 100 DJs.
