The signals behind the system.

HRV. Heart rate variability is the millisecond-level difference between consecutive beats — the cleanest live read on your autonomic nervous system. We watch the dynamics, not single readings, so we catch the inflection before it becomes a peak.

Multi-signal sensing. HRV alone is noisy. Pairing it with heart rate, sleep, motion, and skin temperature reduces false positives and surfaces real shifts. The system reads the chord, not a single note.

Context.Physiology without context isn’t actionable. We cross-reference your calendar, routines, and learned baselines so a spike at 9 AM after a late Sunday is treated differently from one at 4 PM after a hard call.

A deeper write-up — citations, validation, and the references we designed against — is coming next round.