TrueZone vs Bivryn Biological Intelligence

The future of fitness testing. TrueZone offers quick-and-easy, gold-standard fitness testing for coaches or individuals, requiring only a heart rate monitor.

Find what your wearable missed. Bivryn reads across your Apple Health signals — sleep, HRV, recovery, blood work, supplements, behavior — and tells you what's actually moving your biology, in a calm editorial voice. Most health apps overwhelm you with charts, scores, and disconnected metrics. Bivryn synthesizes across Apple Watch, Oura, Garmin, lab panels, and your local weather. It learns your personal baselines from up to a year of your history the first time you open the app, so today's reading sits against your own typical, not generic norms. "Your body is asking for a softer day." "Hard workout Monday. HRV crash Wednesday is your 2-day lag pattern." "Coffee after 2 PM is reducing your deep sleep by 31%." These aren't generic tips. Bivryn finds patterns hidden in your own data — the kind no wearable can spot, because every wearable is locked to its own sensors. Works with what you already have: Apple Watch, Oura, Whoop, Garmin, and lab panels. Now available in English, Hindi, French, German, Spanish, and Hebrew. WHAT BIVRYN DOES Bivryn Bio Age. A continuous biological-age reading from up to nine signals — VO₂max, HRV, heart rate, blood pressure, waist-to-height, sleep efficiency, blood work. Trends with your biology over weeks. AI Body State, daily. A personalized read of how your body is doing today, with the specific drivers behind it. Ask Bivryn anything. Type or ask by voice — why am I tired, what changed this week, does coffee affect my sleep — and Bivryn reads across your full year of biology, logs, weather, and patterns to answer. Discoveries. Bivryn continuously finds correlations across your behavior and biology. "HRV drops for 48 hours after alcohol." Blood Work Intelligence. Upload a lab PDF and Bivryn interprets cholesterol, ferritin, vitamin D, hs-CRP, glucose, hormones — connecting markers to your sleep, energy, recovery. Hormone Panel. Three lenses: cycle phase, mental-health context, longitudinal drift. Self-Experiments. Test one change at a time. Bivryn measures your baseline and tells you honestly whether your biology moved. Body Memory. A living biological timeline — travel, recovery periods, supplement changes, milestones. The narrative layer no wearable dashboard offers. Sleep Architecture. REM, deep, and core sleep with behavior correlation. Cardio Fitness & Training Capacity. Honest reads for athletes who want to push or recover with intention. Reset Toolbox. Evidence-backed breathing, walks, eye rest, and light reset sessions. Doctor Snapshot. One-page PDF for your physician, or a full markdown dossier for AI. Apple Watch companion. Score, recovery curve, breathing sessions, complications on your wrist. Siri & Shortcuts. "Hey Siri, what's my body state?" — or chain Bivryn into any iOS automation. CALM BY DESIGN No streaks. No leaderboards. No daily push-to-be-better. The score is a reading, not a grade. The voice is observational, not prescriptive. Bivryn isn't a doctor and never plays one. DESIGNED FOR High performers, founders, biohackers, longevity-focused individuals, athletes, and anyone tired of fitness-tracker noise who wants their biology to make sense. PRICING 7 days of full access, no card required. After trial: $14.99/month or $99.99/year. Auto-renews unless canceled; managed through your Apple Account. PRIVACY Your sleep, HRV, blood work, and logged data stay on your device. Anonymous usage events help us improve Bivryn — no personal data, no health data, never sold. We don't track you across apps. Local weather is fetched via Apple's WeatherKit; coordinates never leave your device. Terms of Use: https://bivryn.web.app/terms Privacy Policy: https://bivryn.web.app/privacy IMPORTANT Bivryn is not a medical device. It is not intended to diagnose, treat, cure, or prevent any disease. For medical concerns, consult a healthcare professional.