Bio OS

Heartbeats per minute, estimated from the optical pulse in your fingertip. Typical adult resting range: about 60–100 bpm, often lower in active people. Caffeine, movement and stress raise it.

Approximate breaths per minute, estimated from the slow rise and fall of the pulse signal. Typical resting range: 12–20. Shown only when a clear rhythm is found.

Experimental: 130 × CSI (how irregular your beat intervals look). A typical camera reading is around 40%. Strongly affected by movement and signal quality; not a validated stress measure.

Experimental: starts at 90% and drops as heart rate rises above 75 bpm and as the rhythm looks more irregular. A rough hint, not a measure of how energetic you are.

RMSSD: root mean square of successive differences between beat intervals, in ms (capped at 100). Reflects vagal (parasympathetic) activity. Camera readings over 15 s are rough and often run high.

Standard deviation of beat intervals divided by their mean. Lower = more even intervals and a cleaner signal. Typical camera readings are around 0.3; clearly higher values usually mean movement or noise.

How far the latest beat has come back from the highest heart rate in the last 15 s toward the window average. 100% = back at average; 0% = still at the peak, or no peak at all.

Straight-line trend of your beat intervals over the window, sign-flipped. Positive = heart rate rising; negative = heart rate easing down.

Average change between consecutive beat intervals. Positive = intervals lengthening (pulse slowing); negative = shortening (pulse rising). Near zero at rest.

Experimental: 0.7 × Stress plus a bump when estimated breathing is above 15/min. Rises with irregular-looking rhythm and faster breathing; not an anxiety test.

Experimental: higher when the rhythm looks steady (low CSI) and Energy is high (pulse not above ~75 bpm).

Experimental: average of Energy and inverse Stress. Highest with a moderate pulse and steady rhythm; it cannot measure attention.

Experimental: rises with heart rate above 60 bpm (plus a little with breathing rate). Cannot tell excitement from nerves, effort or caffeine.

Experimental: rises as Energy falls and Stress rises, i.e. with a pulse above 75 bpm and an irregular-looking rhythm. Not a measure of tiredness.

Experimental: 60% Focus + 40% Relaxation. Higher with a moderate pulse and steady rhythm; it cannot detect a flow state.