SunDaily 1.6 · Free on the App Store
The UV index app for your daily sunshine habit
Live UV index, hourly UV for the next 10 days and your best sun windows. Set a daily goal and let Apple Watch Time in Daylight count toward it automatically.
For iPhone · iOS 17 or later · No account needed
- LiveUV index, wherever you are
- 240 hoursHourly UV, 10 days out
- AutomaticApple Watch Time in Daylight
- PrivateNo account, data stays on device
Features
Know when to get outside, and whether you did
SunDaily turns the UV forecast into a simple daily routine: check the window, get your time outdoors, close the ring.
Live UV index
Today's UV, for exactly where you are
Open SunDaily and the current UV index is the first thing you see, over a live satellite globe of your part of the world.
- Current UV index and level, from Low to Extreme
- Today's full UV curve with the peak and what time it happens
- "Sun protection recommended" whenever UV is 3 or higher
Hourly UV forecast · Sun windows
Every hour of UV, 10 days out
Tap any day in the 10-day forecast for its hour-by-hour UV, then press and hold the chart to read UV and cloud cover at any time of day.
- Estimated sun window for each day, marked Good and Peak
- Peak UV, solar noon, sunrise and sunset
- A plain-language summary: when UV peaks and when to cover up
Daily goal · Apple Watch
Hit your daily goal without logging a thing
Pick a daily sunshine goal and watch the ring fill. Wear your Apple Watch outside and its Time in Daylight counts automatically through Apple Health.
- Today's Apple Watch daylight minutes are included free
- No watch? Start a manual session on your iPhone
- Home Screen widget with your progress ring
History
Watch your sunshine habit grow
Every session lands on a chart with your average and your goal drawn in. This week is free. Pro opens every month and year, with your Apple Watch daylight filled in for every day.
- This week's sessions and a session log, free
- Month and year views with your full Apple Watch history Pro
- Streaks and days outside this week Pro
Insights Pro
Insights that compare you to you
No leaderboards and no generic targets. SunDaily compares your recent days with your own baseline and tells you what changed.
- Weekdays versus weekends, your best day and your consistency
- Estimated Vitamin D and UV dose, for wellness reference
- Personal records as your habit builds
Free & Pro
Free to use. Pro when you want the full picture.
Everything you need to plan today is free. Pro adds the long view of your habit.
Free
SunDaily
Everything you need to plan today's sunshine. No account, no card.
- Live UV index and today's UV curve
- 10-day forecast with hourly UV for every day
- Estimated sun windows
- Daily goal and progress ring
- Today's Apple Watch daylight minutes
- Manual sessions, with this week's history
- Home Screen widget
7-day free trial
SunDaily Pro
See the habit, not only the day. Everything in free, plus:
- Streaks and days this week, to keep you going
- Your full history: every week, month and year, with Apple Watch daylight for every day
- Personal insights that compare you to you
- Estimated Vitamin D and UV dose
FAQ
Questions, answered
What is SunDaily?
SunDaily is an iPhone app for building a daily sunshine habit. It shows the live UV index for your location, an hourly UV forecast for the next 10 days and your estimated sun windows, then tracks your time outdoors against a daily goal.
Is SunDaily free?
Yes. SunDaily is free to download. The free version includes the live UV index, the 10-day forecast with hourly UV for every day, estimated sun windows, manual sessions with this week's history, and today's Apple Watch daylight minutes.
SunDaily Pro adds streaks and days this week, your full history by month and year with Apple Watch daylight for every day, personal insights, and estimated Vitamin D and UV dose. Pro is $4.99 per month or $39.99 per year with a 7-day free trial.
Do I need an Apple Watch to use SunDaily?
No. You can log time outdoors with manual sessions on your iPhone. If you wear an Apple Watch (Series 6 or later, or SE 2nd generation or later, on watchOS 10 or later), its Time in Daylight measurements flow in through Apple Health and count toward your goal automatically. There is no separate watch app to install.
Where does the UV index data come from?
UV index, cloud cover and conditions come from Apple Weather for your current location. SunDaily shows today's UV curve, the peak UV and what time it happens, and hourly UV for each of the next 10 days.
What is a sun window?
A sun window is SunDaily's estimate of the better times to be outdoors on a given day, based on hourly UV and cloud cover. Windows are marked Good or Peak so you can see at a glance when UV is highest. Sun protection is recommended whenever the UV index is 3 or higher.
Does SunDaily measure my Vitamin D?
No. SunDaily Pro shows an estimated Vitamin D figure and an estimated UV dose calculated from your time outdoors. They are estimates for wellness reference, not measurements, and SunDaily does not provide medical advice.
Is my data private?
Yes. SunDaily needs no account. Your sessions and Apple Health data stay on your device and are never sold or shared. Your location is used only to fetch UV and weather for your area. See the Privacy Policy for details.
More on setup, Apple Watch and billing in Support.
