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Life & fun · August 7, 2025

CadenceSync

I love running to music but most songs are always just slightly too slow or too fast. Finding one that matches your exact cadence always feels awesome, and I thought-- there should be an app for that. So this is an attempt to make that happen for any song you have. Still ironing out some kinks here and there, but seems to work pretty well. TestFlight build available if you want to give it a shot.

CadenceSync launched on August 7, 2025 with 7 votes, #3,174 of 8,530 launches that month. The site was still online in September 2026, 1 year on.

Visit erichamiter.com ↗CadenceSync alternatives

What it does

CadenceSync is an iOS music app for runners. It dynamically adjusts the tempo of your favorite music to match your desired stride rate (SPM – strides per minute). Whether you prefer 160 or 180 SPM, the music will flex to fit your rhythm.

CadenceSync adjusts music playback speed to match your running cadence with pitch-preserving time-stretching. All audio analysis runs on device.

Adjust music playback speed to match your running cadence. Pitch-preserving time-stretching keeps songs in key while you move. Smart tempo matching, live cadence detection, and a library you control. No subscription required. Overlapping 20-second windows are analyzed with multi-threshold peak detection, spectral onsets, and autocorrelation. Results are clustered and normalized for double/half-time relationships. Candidate SPM-to-BPM ratios are scored by tempo-shift size, ratio simplicity, and musical context. The best mapping is applied, capped at roughly 8% slowdown. AVAudioEngine with pitch-preserving time-stretching changes tempo while keeping songs in key. Cadence changes are debounced…from erichamiter.com

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