Libre Light Sensor

Name: Libre Light Sensor
Rating: 4.8 (158 reviews)
Author: John Harrington

By: John Harrington

Measure Light in Lux

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

App Developer Tools Privacy & Security Data

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:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-14

Compare stats and ranking:

Ranking

# 123,534 ▲ 165

For Developers

Monetize with App Pass Boost with Extension Booster

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.