Phone measures, web interprets
Health MindTrack follows a split architecture: the phone captures, the web cabinet helps you see patterns over time. Camera-based pulse measurement does not run in the browser — it runs in the mobile app where the sensor and lighting can be controlled.
Fingertip PPG in plain terms
When you cover the rear camera with your fingertip, the flash lights your skin. Tiny changes in blood volume change how much light reflects back. The app tracks that rhythm to estimate pulse and related metrics.
Tips that actually help
- Stay still — motion is the main enemy of a clean waveform.
- Cover the lens fully — gaps let ambient light in.
- Warm hands help — cold fingers reduce signal.
- One session, one context — compare like with like (same time of day, similar posture).
When quality is low
Every recording carries a signal quality score. If quality is poor, we would rather show that honestly than return a confident-looking number. See reading signal quality.
Raw video stays local
Camera frames are processed on your device. Raw video does not leave your phone for normal use. Details: why raw video never leaves your phone.