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Lux Light Meter Pro

An app that measures how bright a room or desk is in lux.

Home & propertySound and light metersFree planIndie
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What Lux Light Meter Pro does

Lux Light Meter Pro is a free light meter for iPhone and iPad. It reads how bright a space is in lux, shows color temperature and a histogram, and doubles as an exposure meter for photos. People use it for photography, for checking light at a desk, and for figuring out if a spot gets enough light for plants.

Live lux readings from the camera
Color temperature and histogram
Exposure settings for shutter, ISO and aperture
Works on iPhone and iPad

Point your phone's camera at a scene and it shows a live lux reading, the standard unit for how bright a space is. You also get color temperature and a histogram, plus exposure controls for shutter speed, ISO and aperture if you're shooting photos.

It's useful well beyond photography. You can check whether your desk is bright enough to work at comfortably, compare lighting between rooms, or see which windowsill gets the most light before you move a plant or set up a greenhouse.

The app is free with ads, and reviewers say ads can be frequent. In-app purchases for Premium Access and Pro Mode run from $1.99 to $14.99 on the US App Store. Its rating is lower than many tools here and its last update was in October 2025, so treat it as a handy free option rather than a precise instrument.

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Who it's for

Checking light for plants, desks and rooms
Casual photographers who want a quick reading

Skip it if: Anyone who needs lab-grade light measurements.

Pricing

Free plan
Free, with paid extras

Free with ads. The US App Store lists Premium Access at $1.99 and $14.99 and Pro Mode at $9.99, without saying which are one-time or subscriptions.

Prices can vary by country. Checked 19 Oct 2026.

What people like

  • Free to start
  • Useful for plants, workspaces and photos
  • Shows color temperature as well as brightness

Watch out for

  • Ads can be frequent, per reviews
  • Middling App Store rating
  • Upgrade prices aren't clearly labeled

Want a light checker made for your plants or studio? Build your own.

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Try this idea: “an app where I check the light on each windowsill and it tells me which of my plants would be happiest there”

Questions people ask

Is Lux Light Meter Pro free?

Yes, it's free with ads. Optional upgrades cost $1.99 to $14.99.

Can I use it to check light for plants?

Yes. It reads brightness in lux, so you can compare spots around your home.

Is Lux Light Meter Pro on Android?

We only found it on the App Store. On Android, try Light Meter - Lux, Exposure.