Features & Capabilities

Libre Light Sensor uses your iPhone camera to measure ambient light in Lux, delivering precise luminosity readings you can trust.

Track light exposure at wake-up, during the day, and before bed to optimize sleep quality and circadian health with this Chrome extension.

User Growth & Download Statistics

By:
John Harrington
Rating:
4.80
(158)
1 new ratings
Version:
1.2 Last updated: 2022-11-25
Version code:
853543508
Creation date:
2022-09-12
Compatible devices:
Size:
1.26MB
URLs:
Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-14
Compare stats and ranking:

Ranking

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
John Harrington
Apple Apps Store
https://apps.apple.com/us/app/libre-light-sensor/id1644439968

User Reviews

Libre Light Sensor is praised for its simple, ad-free design and generally workable lux readings, especially for eye-exposure and quick comparisons. It’s seen as excellent for education and lightweight use without accounts. However, several reviews note stability problems (not loading/not responding) and occasional inaccuracies with certain lights. Some users also want features such as saving readings and an easy exit. Overall, it’s a handy tool for basic light measurements with some reliability caveats.
Pros
  • Simple and straightforward to use
  • No ads and no account required
  • Generally accurate Lux readings suitable for quick comparisons
  • Useful for eye-exposure and human-light exposure awareness
  • No subscription with potential for a one-time purchase/low-cost option
Cons
  • Occasional stability issues: some users report the app not loading or not functioning on certain devices
  • Readings can be off for certain light sources or lighting conditions, implying reliability concerns for some uses
  • Missing useful features like saving the current reading for later viewing and a quick way to exit the app
Recent reviews
Great for science projects really helped me, I got a %98. Definitely worth getting!
by ZD*****, 2026-04-18

Thanks for such a great app. It does what it says and that's it! Simple and straightforward. I have two suggestions. As I am using this to check the light from my light therapy box, I'm putting it by my eye, so I can't see the reading on the phone screen. It would be great if I could press a button to save the reading at that moment, so I can pull the phone away from my eye and see the reading. Then press the button again to go back to live measurements. And a button to exit the app would be good too.
by NG*****, 2026-03-13

Best app I’ve tried to just measure Lux levels. 11.23.25 Today’s it’s not loading. Hope it’s temporary. Seems like an iOS update messed it up ☹️
by kf*****, 2025-11-23
View all user reviews ›

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