On-device vital measurement using the hardware already in your phone. Contact photoplethysmography (PPG) for heart rate and front-camera optical flow with acoustic fusion for respiratory rate.
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PulseTrace extracts cardiovascular and respiratory rhythms without external accessories. Frames and audio buffers are processed entirely in volatile memory and discarded immediately after computation.
Active Alpha. Personal wellness and measurement software, not a clinical medical device.
Signal processing decisions designed to reject noise rather than fabricate numbers.
Heart rate estimation simultaneously executes three mathematical models: Welch spectral FFT density, normalized lag autocorrelation, and beat-to-beat running median MAD peak filtering. An octave-correction layer prevents 2x harmonic errors before a weighted consensus requires 4 consecutive stable samples across 1,800 ms.
When measuring breathing with the front camera, natural hand tremor causes global movement. PulseTrace anchors a high-frequency tracking reference to the user’s face, filters the translation, and subtracts it from the chest patches to isolate pure thoracic expansion.
Respiration rate pairs optical motion tracking with 16 kHz PCM audio energy analysis. When both sensors agree within 4 breaths/min, confidence is boosted. If acoustic and optical estimators conflict, the reading is rejected with guidance to stabilize.
PulseTrace provides direct interoperability with LastDose via standard Android intents (ACTION_SEND_VITAL). Completed, validated measurements are routed seamlessly into personal medication and wellness logs without third-party cloud bridges.
PulseTrace is built for personal measurement, fitness tracking, and biosignal experimentation. It does not provide clinical diagnosis, disease detection, patient monitoring, or medical guarantees.