Most health apps overwhelm you with charts, scores, and disconnected metrics. Bivryn is different. It reads your Apple Health data and explains, in plain language, what's actually happening in your body.
The Bivryn difference
You can track sleep, HRV, steps, recovery — but still not know why you feel off today, whether coffee is affecting your sleep, or if your supplements are actually helping. Bivryn answers those questions using your own data.
Daily interpretation
"Your body is asking for a softer day."
Sleep debt and elevated overnight heart rate together — Bivryn names the contributors and suggests where to put your energy.
Pattern discovered
"Coffee after 2 PM is cutting your deep sleep by 31%."
From correlating your caffeine logs with your sleep stages across weeks. Not generic — your data.
Recovery read
"Your HRV recovered fully — you're free to push."
Training capacity grounded in your own baselines, not a one-size-fits-all formula.
What Bivryn does
Sleep, HRV, resting heart rate, recovery, respiratory rate, wrist temperature, training capacity, travel impact — Bivryn synthesizes them into one calm sentence. Tap to see the drivers, the math, and what could shift.
Bivryn continuously finds correlations across your behavior and biology — the kind you'd never spot manually. The longer you stay, the smarter it becomes.
Try one change at a time — a new supplement, an earlier dinner, a training protocol. Bivryn captures your baseline, tracks adherence, and tells you honestly whether your biology actually moved.
Upload a lab PDF. Bivryn reads cholesterol, ferritin, vitamin D, hs-CRP, glucose, thyroid markers, hormones — connecting them to your sleep, energy, and recovery. Three lenses for hormone panels: cycle phase, mental-health context, and longitudinal drift.
Five breathing techniques (coherent, box, 4-7-8, physiological sigh, alternate nostril). Mindful walks. Eye rest. Light reset. Bivryn measures the HRV delta before and after, so you see what's actually working for your nervous system.
Travel, recovery streaks, supplement changes, training blocks, milestones. Bivryn keeps the story so you can look back six months from now and see what moved your biology — and what didn't.
Glance at your wrist for your body state and recovery curve. Pin today's focus to your Lock Screen. Ask Siri, "what's my body state?" Run a Bivryn Shortcut from inside ChatGPT or Claude — the integrations are already there.
Apple Watch
Glance + complications
Widgets
Home + Lock Screen
Siri + Shortcuts
6 App Intents
Live Activity
Dynamic Island
Privacy by default
Bivryn doesn't sell your data. We don't share it with advertisers. Your biological signals live on your iPhone and (optionally) sync only to your own iCloud account. You can export everything, or delete everything, with one tap.
On-device
SwiftData + optional iCloud sync. Never sent to our servers.
Portable
Export everything as JSON, anytime, from Profile → Privacy.
Deletable
"Delete all my data" lives in the app. One tap, full wipe.
Important
Bivryn is not a medical device.
Bivryn provides informational and educational insights about your biology. It is not intended to diagnose, treat, cure, or prevent any disease. For medical concerns, please consult a healthcare professional.
Early access
We're inviting a small group to try Bivryn before broader launch. Leave your email and we'll send you a free-trial code when your turn comes up.
One email when your invite is ready. No newsletter.
Bivryn is available for iPhone and Apple Watch. 7-day free trial, then a subscription that unlocks new AI-generated interpretations.
Requires iOS 17 or later. Apple Health and Apple Watch supported.
Beta is free via TestFlight, valid for 90 days, and may include rough edges. Your feedback shapes the App Store release.