Explore your Apple Health data with a private, on-device AI Coach
Choose a Weekly Summary or a guided Status, Why, or Improve question for one of 19 supported metrics and scores. The AI Coach uses available health facts and trends on your iPhone. The app and its fully on-device AI are completely free: no subscription, in-app purchases or account. It offers wellness information, not medical advice.
Guided questions grounded in your available data
The Coach uses summaries such as recent values, weekly comparisons, and longer-term trends where available. Questions come from the app’s picker; this is not an open-ended text chat, and it does not retain conversational memory. Health data and inference stay on your iPhone.
Status: Stress Resilience
Review the available score and supporting health context without treating it as a measurement of psychological stress.
Status: Circadian Alignment
Explore sleep and activity timing patterns behind the app’s wellness estimate.
Improve: a selected metric
Choose a supported metric to see general wellness suggestions in the context of your available data.
Why: HRV
Explore related sleep, activity, and recovery facts. An explanation can suggest context; it cannot establish what caused a change.
Weekly Summary
Compare the last two complete weeks using the health facts available on your iPhone.
Choose your AI package
Both model packages are free and optional. Without a downloaded model, the Coach uses template-based answers. Choose a package in Settings when you want local AI generation; the app checks compatibility before offering Advanced.
Recommended (Qwen3.5 2B)
Approx. 1.5 GB including embeddings
The smaller model package. Availability and performance depend on your device and available memory.
Advanced (Qwen3.5 4B)
Approx. 3 GB including embeddings
The larger model package, offered on eligible devices with sufficient memory. The app checks compatibility.
The packages include a chat model and an embedding model. Allow additional space for downloading and app data. Advanced is intended for eligible devices with 8 GB-class memory; available memory also affects compatibility.
How it works
- Update to the latest My Bio Age release and open the dashboard.
- Tap the AI Coach button to browse the supported question types.
- Optionally download a compatible model package. The download needs internet access; model files remain local and can be removed in Settings.
- Select a supported metric or Weekly Summary, then review the answer alongside your data. AI explanations may be incomplete or incorrect.
What stays on-device
- Health facts derived from available, permitted Apple Health readings
- AI model weights, prompts, and responses
- Stress Resilience and Circadian Alignment calculations
- Weekly Digest summaries and Pace of Aging history
Health facts and questions are not uploaded for AI answers. Optional model files download from Hugging Face when requested. Afterward, generation runs locally without a cloud inference service.
Requirements and controls
Device + storage
- iPhone running iOS 26 or later
- About 1.5 GB for Recommended or 3 GB for Advanced, plus working space
- Advanced availability depends on device memory and the app’s compatibility check
- Apple Watch optional but improves cardio-fitness signals
- Internet access is needed for optional model downloads; answers run locally afterward
Privacy by default
You choose Health access and can manage model files and local data in the app’s Settings. Changing a Health permission controls future access; it does not by itself erase previously cached data. No transcript is uploaded to a cloud AI service.
Missing context? Follow our Apple Health data troubleshooting guide.
Your health questions. Your iPhone. No subscription.
Download My Bio Age free on the App Store and explore the AI Coach. Download a compatible model once, then get answers entirely on your device. Your health facts and questions are never sent to a cloud AI service. No in-app purchases.