BPM finder for your whole library, on-device, not online
Claimp is a native Mac bpm finder that analyzes BPM and musical key across your local library. It works on-device, writes results into file tags, and keeps the tracks on your Mac.
Can a BPM finder analyze a whole music library?
Online tools such as Tunebat commonly ask you to look up or upload one song at a time. Claimp takes a library approach: add your local folders, select tracks, and run Analyze tracks. The MusicUnderstanding framework built into macOS 27 computes tempo and musical key on the device.
The result stays useful outside the app. Claimp writes tempo and key into TBPM and TKEY tags, or BPM and INITIALKEY where the file format uses those fields. Key appears in Camelot form, such as 8A, with the note name available on hover. This makes Claimp a bpm detector and bpm key finder for files you already own.
What does a BPM key analyzer add to set preparation?
A bpm key analyzer helps you compare tracks before a set. Claimp places BPM and Key beside Year, length, and kbps in a sortable playlist. You can filter by typing a few letters, reorder columns by dragging their headers, resize them, and mark tracks already used in the mix.
The spectral waveform adds another view of the track. Its height shows loudness, while colour shows spectrum from red bass through yellow, green, and blue to violet highs. A click jumps to that point. The analysis image below shows BPM and Camelot key in the playlist.
Is Claimp an online BPM finder or DJ mixer?
Claimp is not an online service. Tracks and analysis remain on your Mac, with no cloud involved. It is free, open source under Apache-2.0, built natively with Swift and AppKit, and requires macOS 27 or later.
Claimp does not mix or blend tracks and does not replace rekordbox, Serato, or djay for a live performance. It is a player for preparing a set. When a track is ready, drag the real audio file from a playlist row or the cover art into Ableton, Bitwig, or Finder.
Questions
- Is there a real-time BPM detector available?
- Claimp analyzes saved tracks rather than listening to a live input. Select tracks in your local library and it computes BPM and key on-device with MusicUnderstanding in macOS 27.
- Is this BPM finder free?
- Yes. Claimp is free and open source under the Apache-2.0 license, and its BPM and key analysis runs on your Mac.
- What does the BPM and key analyzer save?
- Claimp writes tempo and key into TBPM/TKEY or BPM/INITIALKEY tags. It shows the musical key in Camelot notation in the playlist.