# Hummingbird Biofeedback — Live HRV — Whoop, Polar, more > Live HRV — Whoop, Polar, more (iPhone/iPad app by Samantha Chan.) - Source: https://appshunter.io/ios/app/hummingbird-biofeedback/id6762854409 (this page in markdown: same URL + `.md`) - Developer: [Samantha Chan](https://appshunter.io/developer/1842619270) - Category: Health & Fitness - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.1 · 34 MB - Languages: American English - Released: 2026-05-08 - Data updated: 2026-08-29 - User reviews in markdown: https://appshunter.io/ios/app/hummingbird-biofeedback/id6762854409/reviews.md ## What is 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 three live readouts update underneath — a real-time picture of what your nervous system is doing, not just one number. — WHAT YOU WATCH, LIVE — HRV 5-minute rolling rMSSD — the same metric used across the HRV ecosystem. Different moment of the day than your nightly score, same math. RSA Vagal depth. Every breath stretches and releases your heart rate; RSA measures how big that swing is, in milliseconds. It's the amplitude of your breath's pull on your heart — and slow, deep humming widens it. Watch it widen, breath by breath. COHERENCE Rhythm, on a 0–100 scale. How clean and orderly that wave is. When your breath and heartbeat settle into one smooth oscillation, coherence climbs toward the resonance "zone" — the difference between a flute holding one clear note and a radio stuck between stations. Why three and not one? HRV alone is jumpy, and during slow breathing it can even dip — even as the rhythm underneath gets deeper (RSA) and cleaner (coherence). The extra two metrics catch what a single number misses, so you can watch a session take shape in real time instead of guessing. What does five minutes of slow humming do to these numbers 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 still captures HRV, RSA, and coherence 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). ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Hummingbird Biofeedback | $29.99 | one-time | ## Version history (last 4 releases) ### 1.0.1 — 2026-06-16 NEW — Stress: your live state, measured against your own normal. Hummingbird now folds your live HRV and heart rate into a single 0–100 Stress score, anchored to your personal 30-day baseline. 50 is a typical day for you; lower means HRV up and heart rate settled, higher means your body is working harder than usual. Because it's calibrated to your physiology — not a population average — it reads your engine, not the average engine, like an RPM gauge that knows the difference between a sports car and a diesel. It updates live during a session and sits on your home screen between them, and every session shows a pre→post delta — so one glance answers the question HRV alone makes you work for: am I wound up right now, and did that session change it? It's a glance, not a diagnosis. ### 0.7.12 — 2026-05-20 Two new ways to see your practice working: RSA and Coherence. rMSSD alone can be a noisy read of vagal activity during slow, paced breathing — it often drops even when a session is going well. So we added two metrics that look at the same heartbeat data from a clearer angle, with no extra hardware and no extra strain on your strap. • RSA measures the depth of your breath-driven heart-rate swing — how strong your "vagal brake" is. It rises during effective humming and paced breathing, and it's trainable: it strengthens with consistent practice, like a muscle. • Coherence scores how clean and rhythmic that oscillation is, 0–100. High coherence means you've locked into a smooth, steady resonance — the state people associate with feeling calm and focused. Both appear live in the in-session bio strip and as 7-day trends on your home and Impact screens. Tap either tile to see how to read them together — RSA reads depth, Coherence reads cleanness, and the combination tells you more than either alone. ### 0.7.7 — 2026-05-11 Added ability to share a session to social media: x, facebook, whatapp, etc... ### 0.7.6 — 2026-05-08 No release notes. ## More apps by Samantha Chan - [Wisteria Reader](https://appshunter.io/ios/app/wisteria-reader/id6753122777) All apps by Samantha Chan: https://appshunter.io/developer/1842619270 ## Related topics [biofeedback](https://appshunter.io/ios/topics/biofeedback) · [hummingbird biofeedback](https://appshunter.io/ios/topics/hummingbird-biofeedback) · [hummingbird](https://appshunter.io/ios/topics/hummingbird) · [biofeedback app](https://appshunter.io/ios/topics/biofeedback-app) · [hrv biofeedback](https://appshunter.io/ios/topics/hrv-biofeedback) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*