The Most Accurate Free Key Analyzer
OpenKeyScan is a free, open-source key detector that ranks among the most accurate available, matching or beating many paid and built-in tools.
- Studio-grade key detection built for harmonic mixing and production.
- Free with open-source analyzer engine. No subscriptions.
- Works with all major DJ apps and audio formats.
Proven Accuracy & Performance
Independent community tests confirm OpenKeyScan performs at the very top of modern key analyzers, delivering professional results for free.
Top-Tier Accuracy
Outperforms built-in detection in Rekordbox, Serato, and Traktor, rivalling the industry standard Mixed In Key.
Ultra-Fast Batch Processing
Analyzes hundreds of tracks per minute, optimized for large libraries on multi-core processors.
Free & Open Source
Free to use without subscriptions. The engine is open for anyone to inspect and improve.
Accucary & Performance Comparison
Based on independent community tests (2025).
Comparison of major DJ platforms and key analysis tools.
Built for Real DJ & Studio Workflows
OpenKeyScan gives you professional key detection without the paywall. It’s designed to slide straight into your existing workflow, whether you’re prepping a set, building edits, or organizing a sample library.
Industry-leading accuracy
Built with modern DSP and tonal analysis, tuned against real-world libraries and independent tests.
100% free, forever
No trial, no subscription, no locked features. All key detection features are available from day one.
Fast batch analysis
Scan folders, crates or entire libraries in a single run, with clear progress and quick results.
Harmonic mixing ready
Output keys in Open Key, Alphanumeric and traditional notation so you can mix how you prefer.
Works with all major DJ apps & DAWs
Analyze tracks for any DJ app or DAW. OpenKeyScan writes the key directly into your files so all compatible software reads it automatically.
Open-source transparency
Fully open codebase so the community can inspect, improve and verify what's happening under the hood.
Universal Format Support, DJ-Ready Output
OpenKeyScan supports the most common file types in modern DJ and production workflows and writes clean metadata so your software can read results instantly.
Supported audio formats
Analyze everything from full-length tracks to stems, acapellas and samples:
If your music library lives in standard digital formats, OpenKeyScan can handle it. OpenKeyScan writes key data into your files so compatible software can read it automatically. No proprietary library formats, just standard metadata.
Why Accurate Key Detection Matters
Harmonic mixing depends on correct key information. Even one incorrect tag can break the flow of your set.
OpenKeyScan delivers accurate, repeatable results - something DJ tools often miss with dense or complex tracks.
- Smoother, more musical transitions.
- Make confident decisions while mixing live.
- Cleaner mashups, edits, and blends.
- Less time second-guessing — more time on selection.
Designed for harmonic mixing
OpenKeyScan supports multiple key notations so you can work in the way that feels most natural:
- 2 Open Key notation for an alternative system favored by some DJs and tools.
- 1 Alphanumeric notation for quick, visual harmonic mixing using the classic wheel.
- 3 Traditional notation (e.g. A minor, F♯ major) for producers and musicians.
Use the notation that makes the most sense for your brain, your sets and your software. OpenKeyScan keeps the underlying analysis consistent across all formats.
How OpenKeyScan Works
OpenKeyScan uses advanced AI to "see" your music, not just listen to it. The system converts audio into a visual spectrogram—like sheet music made of glowing bars—then uses a Convolutional Neural Network (CNN) to recognize harmonic patterns, chord progressions, and tonal textures.
By comparing your track against thousands of known key fingerprints, OpenKeyScan identifies the correct musical key and outputs it in Open Key notation, Alphanumeric, or traditional notation—all while running completely offline on your machine.
Learn more about how it works →Automate Key Detection for Your Business
OpenKeyScan is built for scale. Whether you run a record pool, music store, or manage a large catalog, our built-in REST API lets you integrate accurate key detection directly into your automated workflows.
- REST API accessible via localhost
- Batch processing support
- JSON output for easy integration
"file": "/incoming/track_01.mp3"
}
"success": true,
"key": "5m",
"file": "/incoming/track_01.mp3"
}