Measure what matters.
StudyLight
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Is your child's desk light helping or straining their eyes?
The American Optometric Association lists poor lighting among the causes of eye strain. Find out what your child's study space scores, free, in a few seconds.
Free Study ScoreNo account neededNo adsAndroid 7.0 or later
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Why it matters
What the research says about light and reading.
Lighting
Poor lighting and improper viewing distance are listed among the causes of digital eye strain.
American Optometric Association
30 cm · 30 min
Reading closer than about 30 cm, and for more than about 30 minutes without a break, were each associated with short-sightedness in children.
Sydney Myopia Study (Ip et al., 2008, IOVS)
~50%
Around half the world's population could be short-sighted by 2050.
WHO–BHVI joint report
Lighting and reading distance are hard to judge by eye.
Associations from research, not proof of cause. StudyLight does not diagnose, treat or prevent any condition.
Four measurements. One score.
How each one is measured →01 · lx
Room brightness
Read from your phone's ambient-light sensor.
02 · K
Light colour
Read by the rear camera, analysed on the phone.
03 · cm
Reading distance
Estimated by the front camera. Guidance adjusts to your child's age.
04 · h
Daylight today
Calculated on the phone from your location and the date.
A scan takes a few seconds.
Place the phone on the desk
Where your child actually reads or writes. It measures brightness and light colour.
Hold it at reading position
The front camera estimates reading distance. The photo is analysed and deleted on the phone.
Read the Study Score
From 0 to 100, with how many of the four factors need attention.
Questions about scans, Pro or your data? Read the Help & FAQ →
The apps
Measurement tools for the places children live and learn.
LIVEStudyLight
The study space, measured: brightness, light colour, reading distance and daylight today.
Free · Pro ₹949 (India) / US$19.99₹949US$19.99 first year
IN DEVELOPMENT
More measurement apps
Each measures one everyday environment with the sensors already in your phone.
Built for a family's phone.
No account needed
Install and scan. Signing in is optional.
No ads
No ad SDKs and no advertising ID.
Images stay on the phone
Camera frames are analysed on the device and never uploaded.
Works offline
Scanning and scoring need no internet connection.
The science
Background reading on light and study spaces.
Study light
The night Mateo's eyes started to fail — and what his parents never knew to measure
It began with squinting at the whiteboard. Here are the four numbers in his study space that nobody had measured.
9 MIN READ
Light & biology
The human eye was never designed for artificial light.
Human eyes evolved under sunlight and firelight. Then electric light arrived.
7 MIN READ
The study environment
The room your child spends the most time in is the least measured space in your home
You measure temperature, water quality, and air conditioning. Here's why the study room matters too.
5 MIN READ
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