Check UV and sun timing
See current UV plus sunrise and sunset so you can plan smart outdoor time.
SunnyDay for iOS
Build healthy, sustainable sunlight habits.
Track your daily light exposure with Apple Health Time in Daylight data, check live UV and sun timing, and build better routines over time.
How it works
Track Time in Daylight
Use Apple Health data to understand your daily and weekly light exposure trends.
Build routines that stick
Use simple tracking and reminders to make sunlight habits easier to sustain.
Why SunnyDay
Data you can actually use
Visualize 7 / 30 / 60 / 90 day exposure history and review your day-by-day pattern.
Built for everyday wellness
Learn about mood, sleep, and vitamin D in simple language while you track progress.
App preview
Today
Daylight
Record
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Privacy and trust
Local-first data handling
SunnyDay stores your app data on-device and does not send your Health data to a backend.
Apple integrations
Built with Apple Health and WeatherKit for daylight tracking and UV-aware guidance.
Support
Need help with SunnyDay? Contact us at support@sunny-day.app.
FAQ
What devices are supported?
SunnyDay requires iOS 26 or later on iPhone. For Apple Health Time in Daylight data, you need a compatible Apple Watch (SE 2, Series 6, Ultra, and newer).
Can I use SunnyDay without an Apple Watch?
Yes. You can still use UV and sun timing features and manually record daylight sessions. Apple Watch is needed only for automatic Time in Daylight tracking from Health.
Do I need Apple Health access?
For exposure tracking features, yes. SunnyDay reads and writes the Time in Daylight quantity type for history views and manual recordings.
Is this medical advice?
No. SunnyDay is a general wellness app and does not provide medical advice, diagnosis, or treatment.
Coming soon to the
App Store