Cratekey: DJ Key Finder
Camelot, BPM & harmonic mixing
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Key, BPM and beatgrid for tracks you own. Camelot notation, harmonic matches, fixable results. Analyzed on your device, never uploaded; only purchases use the App Store.
Key and BPM for the crate you already own.
Point Cratekey at the audio files on your device and you get a crate list with the key in Camelot, the BPM, the length and the loudness. Analysis runs entirely on the device; your audio is never sent to a server.
WHAT THE ANALYSIS GIVES YOU
• Batch analysis — hand it a folder's worth of files and let it work through them
• Camelot, Open Key or standard notation, switched whenever you like
• What mixes next — same key, one step around the wheel, and the relative major/minor, kept in separate groups so you can see which is which
• Export — CSV for the whole crate, plus a beatgrid file with the anchor, BPM, meter and beat position
• Loudness (LUFS) and track structure
WHAT IS FREE AND WHAT CRATEKEY PRO ADDS
Importing, key and BPM analysis (up to 20 tracks), the ×2 / ÷2 and manual BPM fixes, flipping to the relative key, switching notation, and browsing, sorting and searching the crate are free. Unlimited batch analysis, what-mixes-next suggestions, CSV and beatgrid export, and track structure and loudness are part of Cratekey Pro (one-time purchase).
WHEN THE ANALYSIS GETS IT WRONG
Key and BPM detection is not infallible, and Cratekey does not pretend otherwise.
Drum & bass and other fast material often comes back at half speed — tap ×2.
Major/minor (relative key) mix-ups can be corrected by flipping to the relative key; the harmonic matches are then worked out again from the corrected key.
Anything you fix by hand is kept, and no re-analysis will overwrite it.
WHAT IT DOES NOT DO
• DRM-protected tracks — Apple Music and other streaming downloads — cannot be analyzed. Cratekey works on audio files you keep on the device.
• Analysis runs while the app is open. A large crate takes a while, so leave Cratekey in the foreground and let it finish.
• The CSV and beatgrid are files you can read, script against, or feed into a conversion tool. Cratekey does not write into another DJ application's library.
No account. Audio analysis is completed on the device and your audio is not sent to any server (purchases and restores talk to the App Store).
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Each row in your crate now shows the key, title, BPM and length. Tap a row to open its details.
• BPM fixes (÷2, ×2, Edit, Back to detected) are now in the details. ÷2 and ×2 are also available when you swipe right on a row.
• Swipe left on a row to remove it from your crate after a confirmation. Your original audio file is not deleted.
The developer, Yuya Tanaka, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yuya Tanaka
- Size
- 4.7 MB
- Category
- Music
- Compatibility
Requires iOS 27.0 or later.
- iPhone
Requires iOS 27.0 or later. - iPad
Requires iPadOS 27.0 or later. - Mac
Requires macOS 27.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 27.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Cratekey Pro $7.99
- Copyright
- © 2026 ZA-ONE