Hummingbird Biofeedback

Hummingbird Biofeedback reads the Bluetooth signal your heart-rate strap (Whoop, Polar H10, Garmin HRM, …) is already broadcasting and shows live HRV, beat by beat, on your screen. No server. No account. The strap you already own, finally fully visible — alongside real-time biofeedback for humming, meditation, breathwork, or simply sitting still.

Pick a humming pattern and a pitch target moves across the screen, you hum along, and your live HRV updates underneath in 5-minute rolling rMSSD — the same metric used across the HRV ecosystem. Different moment of the day than your nightly score, same math. Or skip the mic entirely with STILLNESS — same instrumentation, no humming, just you and the strap.

What does five minutes of slow humming do to your HRV right now? What about fifteen minutes of meditation? Hummingbird is the simplest answer.

— FIVE HUMMING PATTERNS —

UNWIND Slow descending hum, the most-studied pattern.
DRIFT Long, narrowly-descending hum with a lullaby-shaped contour.
ANCHOR A held, steady pitch at a slow cadence.
RESONATE Pitch and pace near the cardiovascular resonance band (~6 BPM).
EXPLORE Free-form humming — no target, no prescribed cadence.

— PLUS STILLNESS —

Silent, mic-free biofeedback for any quiet practice — meditation, yoga nidra, body scan, pre-sleep wind-down, post-stress reset. No pitch target, no prescribed cadence. A passive expanding ring paces ~5.5 breaths/minute if you want an anchor; ignore it and the session captures the same metrics either way. Pick a 5, 10, 15, 20, or 30-minute timer (or Open) and tag the session with what you actually did, so a 6-ms rMSSD rise after "Pre-sleep" and a 6-ms rise after "Cold plunge" stay sortable in your history.

Tap the (i) on any card for the design rationale and references to the published research that informed each parameter (pitch contour, range, cycle timing, session length).