Sync your biology with the natural light cycle

A local-first circadian rhythm app. Solar-aware vitamin D tracking, blue-light protection, and focus mode — all on your device, encrypted, with zero telemetry.

Google Play Coming soon Read our privacy policy

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Solar engine

Real-time sun position, vitamin D window, and UV exposure for your exact location.

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Blue light filter

System-wide evening overlay that dims blue wavelengths without darkening your screen.

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Solar alarms

Wake with sunrise. Alarms that fire at astronomically-computed times, not arbitrary clocks.

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Focus mode

Block distracting apps during chronotype-aligned deep-work windows.

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Circadian score

A 0-100 daily rating across four pillars: light, sleep, timing, and recovery.

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Private by design

AES-GCM encryption at rest. No accounts, no analytics, no ad IDs, no server.