iOS App by Tomocreate
KeyPulse
Know the BPM. Know the Key. Instantly.
Tap once. Your mic does the rest. BPM and harmonic key — right there on screen.
Professional analysis.
Built for the booth.
What It Does
Everything You Need.
Real-Time BPM Detection
Tap the mic button and KeyPulse analyzes the track playing around you. BPM displayed in under 3 seconds.
Classic Key Display
Shows the key in standard notation (Am, C, F#m…) — the format you already know from your library tags.
Harmonic Key (Camelot)
Instantly converts to Camelot Wheel notation (10A, 4B…) so you can mix in key without looking anything up.
Both Keys at Once
Classic and Camelot displayed simultaneously. No switching, no confusion — just the full picture.
Mic-Based Analysis
No file imports, no library syncing. Hold your phone up to the speaker. That's it.
DJ-First Design
Large, glanceable display built for dark booths. Read it in a second without breaking your flow.
How It Works
Three steps. That's it.
Listen
Hold your iPhone near any speaker or monitor.
Analyze
KeyPulse captures the audio and detects BPM and key in real time.
Play
See Classic key + Camelot notation on screen. Mix with confidence.
See It In Action
Built for the booth.
Ready to Analyze
Listening...
BPM & Key Result
Screenshots show a pre-release build. Final design is subject to change.
Under the Hood
Precision built on real music.
KeyPulse doesn't guess. It runs a multi-engine analysis pipeline combining traditional signal processing, on-device machine learning, and Apple's music identification — all in parallel.
real music samples used to train our ML models
BPM accuracy within ±2 BPM on trained data
musical key detection accuracy on trained data
independent analysis engines cross-verify every result
Multi-Engine DSP
Four independent tempo detection algorithms — autocorrelation, onset intervals, frequency-band separation, and windowed analysis — vote together to eliminate false readings.
On-Device Machine Learning
A custom-trained neural network, built from thousands of real DJ tracks, runs entirely on your iPhone. No cloud. No latency. No data leaves your device.
Song Identification + Studio Audio
When a track is recognized, KeyPulse fetches studio-quality audio and re-analyzes it — bypassing microphone noise entirely for maximum accuracy.
Confidence Transparency
Every result shows a confidence indicator: Reliable, Likely, or Rough. If the signal is too weak, KeyPulse says so honestly instead of showing a wrong answer.
Optimized for electronic dance music — House, Techno, Trance, and EDM — the genres where BPM and key accuracy matter most.
Versatile by design
Not Just for
DJs.
Designed for the DJ booth. Surprisingly useful everywhere else.
Producers, musicians, music teachers, curious listeners — if you've ever wanted to know what key a song is in, KeyPulse answers instantly.
Ready?
Your next mix starts with the right key.
Available soon on the App Store.
App Store and iOS are trademarks of Apple Inc. The Camelot Wheel notation system is a trademark of Mixed In Key LLC. All product names and trademarks are property of their respective owners.