Light Meter: Lux Meter & fc

Point your camera and measure brightness in lux. With use-case guides and calibration.

Turn your iPhone into a handy light meter. It uses your camera to estimate the ambient light around you and shows the reading in lux (and foot-candles) in real time — no extra hardware needed.

Whether you're setting up a reading nook, checking if your houseplants get enough light, dialing in a photo shoot, or making sure your desk is bright enough to work comfortably, just point and read.

Features:

• Real-time light readings with minimum, average and maximum values
• Brightness guides for everyday situations — desk work, houseplants, photography, the living room and the bedroom — so you instantly know if the light is too dark, just right or too bright
• One-point calibration to match a reference or a dedicated light meter for more practical accuracy
• Freeze the screen to hold a reading
• Switch between lux and foot-candles (fc)
• Measurement history with CSV export
• Available in multiple languages

A note on accuracy: brightness is estimated from your camera's exposure, so readings can vary from one device to another. For results you can rely on, we recommend using the built-in calibration against a known reference. Your privacy comes first — no photos are ever stored or sent.