My Bio AgeMy Bio Age
On-device AI • Recovery rings • Weekly digest

Ask your health data anything. Keep your biological age trending younger.

The MyBioAge Index™ blends 12+ health metrics—VO₂max, HRV, Recovery Capacity, Sleep, Pace of Aging, and optional BP—into one score. An on-device AI assistant explains changes, while Activity Rings-style Recovery metrics and Monday digests keep you on track.

Download on theApp StoreExplore AI assistant
Health metrics tracked
12 core metrics + optional BP, pacemaker & pregnancy modes, weekly smoothing
AI answers
On-device assistant explains VO₂max, HRV, Sleep, and weekly changes
Recovery & Strain
Recovery ring + Training Load zones with 4-signal breakdowns for each

MyBioAge Index™ combines scientifically-weighted health signals—VO₂max, HRV, Recovery Capacity, Sleep, Resting HR, Active Energy, Walking HR, and optional Blood Pressure—to reflect your cardiorespiratory fitness, recovery, and cardiovascular health.

My Bio Age app showing Fitness Age and Biological Age charts

Highlights

Engineered for iOS 26 with science-backed scoring.

The MyBioAge Index™ translates raw HealthKit signals into actionable context without leaving your device.

On-device Health Data AI Assistant

Ask about VO₂max, HRV, sleep, Recovery Capacity, or weekly changes. Choose Recommended (~2GB) or Advanced (~5GB, auto-detects device compatibility) models—all running locally with zero cloud calls.

Recovery & Strain dashboard

Streamlined two-metric view: Recovery ring with 4-signal breakdown plus Training Load zone bar with color-coded zones. Tap for detailed Recovery Signals and Strain Signals on iPhone and Apple Watch.

Weekly digest + Pace of Aging

7-day smoothing across all metrics plus Pace of Aging near the top so you see whether you're trending younger than chronological time.

MyBioAge Index™

Blends 12 scientifically-weighted health signals—VO₂max, HRV, Recovery Capacity, Sleep, Resting HR, Active Energy, Walking HR, and more—into a single score computed locally.

Advanced precision

Optional Blood Pressure tracking with external monitor adds enhanced accuracy—purely additive, no penalty if not tracked. Pacemaker and Pregnancy support modes available.

Privacy-first design

Data stays on your device. Zero servers, zero cloud storage, zero analytics. You control everything with granular Health permissions.

Methodology

Built on Apple Health science, delivered with native polish.

Every insight comes from HealthKit, scored locally, and backed by documented inputs & limitations. When you want the deeper dive, the Methods page outlines references like FRIEND VO₂max norms.

Sources include FRIEND cardio fitness reference standards, Apple Health documentation, and peer-reviewed recovery research.

📥 Collect (with your permission)

We read 12 core health metrics from Apple Health—VO₂max, HRV (SDNN), Recovery Capacity, Resting HR, Walking HR, Sleep Duration & Regularity, Active Energy, and more—once you grant access. Apple Watch estimates VO₂max during eligible outdoor workouts using its sensors and Apple's cardio-fitness model.

  • HealthKit permissions are granular and can be changed anytime in the Health app.
  • Optional Blood Pressure support with external monitor adds enhanced precision to your biological age score.
  • Pacemaker-adjusted mode excludes fixed HRV values and redistributes weight to other cardiovascular metrics.
Dive into Methods & Sources
🧮 Score (on-device)

MyBioAge Index™ combines 12 scientifically-weighted health signals—VO₂max, HRV, Recovery Capacity, Sleep, Resting HR, Active Energy, Walking HR, and more—to reflect cardiorespiratory fitness, recovery, lifestyle factors, and overall cardiovascular health. All scoring happens entirely on your device.

  • MyBioAge Index™ refreshes whenever new HealthKit samples arrive.
  • Pace of Aging tracks how fast you're aging with 4-week and 14-week trends.
  • On-device AI Assistant answers questions about your trends using the same local data.
Dive into Methods & Sources
🤖 Explain (AI + Monday mornings)

Every Monday at 9 AM you receive an in-app digest with 7-day smoothing. The on-device AI Assistant can explain why metrics moved and what to do next—without ever sending data to the cloud.

  • Background processing prepares the summary without servers—zero cloud storage.
  • See reasons, not just numbers—know which metrics drove your biological age changes and ask follow-up questions.
  • Metric detail screens show 14-week trends and baselines for all tracked health signals.
Dive into Methods & Sources

In-app preview

Designed for quick reads and deep dives.

The hero dial, weekly digest, and trends keep the MyBioAge Index™, Functional Age, and drivers easy to scan on iPhone, widgets, and watch.

Fitness Age and Biological Age dashboard
Fitness Age and Biological Age dashboard
Weekly digest explaining why your age changed
Weekly digest explaining why your age changed
Trend charts for VO₂max and recovery metrics
Trend charts for VO₂max and recovery metrics
Latest articles

Learn how to get more from the MyBioAge Index

We share coaching tactics, science explainers, and privacy updates to help you stay a step ahead of traditional health tracking.

View all articles
Pregnancy Mode: Accurate Biological Age Tracking During Pregnancy

Pregnancy causes significant physiological changes that affect many health metrics. Our new Pregnancy Mode adjusts how metrics contribute to your Index so normal pregnancy changes don't incorrectly impact your score.

Streamlined Recovery & Strain Dashboard: Focus on What Matters Most

We've refined the Recovery Dashboard to display two rings (Recovery and Strain) with a Training Load Zone Bar, making it faster to understand your daily training readiness.

How to Track Your Biological Age Like Bryan Johnson (Without the $2M Budget)

Bryan Johnson spends $2M yearly on longevity. You can track the same biological age metrics for free with My Bio Age on iPhone and Apple Watch.

Questions

Answers before you even download.

If you don’t see your question, reach out via the contact form. We listen.

Contact us

Questions, partnerships, or press? We’d love to chat.

We typically respond within two business days. Share as much detail as you’d like.

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Ready when you are

Start tracking your biological age this Monday.

Get your comprehensive MyBioAge Index™ with Monday morning insights delivered in-app at 9 AM. Track 12 metrics, Recovery Capacity, Pace of Aging, and more—all on-device with zero servers. Have questions? Reach out anytime.

Download on theApp StoreContact support