Show HN: I built a daily sunlight tracker
2 vickipow 1 6/26/2025, 11:28:36 PM lumehealth.io ↗
I kept trying to explain how important outdoor light is and how most people aren’t getting enough. Eventually I figured that showing is more effective than telling.
So we built a free app that uses your Apple Watch or iPhone to automatically track your light exposure throughout the day.
It tells you if you’re getting enough, shows you how consistent you are, and rewards habits that support hormone balance.
It's in beta on TestFlight, let me know what you think!
- Having a dark theme seems logical for an app focused circadian rhythms, would be nice to have a dark appearance
- Not being able to switch between days by swiping felt quite annoying: the Home page requires two taps to change to another day, and the Progress page needs one — but it could’ve been a swipe. And the calendar on the Day page can’t be swiped down, only closed by tapping on the (x).
I hadn’t even realized that Apple had rolled out Time in Daylight — Apple Health hasn’t promoted or highlighted it like it does for other new Categories, and even then, the visualization still feels lacking.
I have been trying to get more consistent morning natural light exposure lately, so this is perfect timing!