Optimize Your Sun Exposure

Smart tracking for your natural Vitamin D synthesis. Syncs seamlessly with Apple Health and Apple Watch.

Download on the App Store
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Active & Passive Tracking

Start a timer using Live Activities, or let our smart background tracking handle it based on your location and local UV index.

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Apple Watch Ready

Leave your phone at home. Track your sun exposure directly from your wrist with full standalone WatchOS support.

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Apple Health Sync

All your naturally synthesized Vitamin D is automatically logged to HealthKit. Keep all your health data in one place.