FLUX reads your live heart rate — or your cadence — and matches your music's BPM in real time. No watch required. The dynamic layer over static sport.
FLUX doesn't recommend music — it reacts to it. Your live heart rate drives the zone, and the right track from your own library plays automatically, crossfaded to your effort.
Pair an Apple Watch or Bluetooth sensor. FLUX reads your live heart rate, maps it to your personal zones, and plays the track that matches your effort.
No gear? Your phone counts your steps per minute and locks the music's BPM to your stride — so every beat lands with a footfall. Nothing to wear, nothing to charge.
Build structured workouts, push them to your athletes, and see real-time compliance. Coach Mode turns your program into a synced run.
Get product updates and be the first to hear when FLUX hits the App Store.
Need help? Full support → or email syncyourbeat@gmail.com