Science
Eight signals.
Two hundred fifty times per second.
The sensor array inside HealthRing is built around a custom infrared PPG block, paired with on-device AI that runs entirely on your finger. no cloud round-trip required for the metrics you see every morning.
Infrared PPG
Three-wavelength array captures pulse, SpO₂ and waveform shape 250×/sec.
Skin temperature
Two-point thermistor with 0.05°C resolution; nightly baseline drift.
3-axis accelerometer
Movement, gesture and sleep-position detection at 50 Hz.
Capacitive contact
Confirms skin contact before every measurement. no false readings.
Accuracy
Validated against clinical references.
Heart rate
±2 BPM
vs ECG reference
HRV
±4 ms
vs Polar H10 reference
SpO₂
±2 %
vs Pulse oximeter reference
Sleep staging
87%
vs Agreement with PSG
A night of sleep, visualised
7h 48m · Sleep score 92
11 PM2 AM5 AM7:30 AM