This tool transforms your iPhone into a professional light meter, measuring illuminance in lux and foot-candles in real-time. It offers exposure calculations, color temperature estimates, and various presets for different use cases, all while working offline and without ads.
1.2
September 24, 2026
• New: Grow Light meter — turn any reading into PPFD and the Daily Light Integral (DLI) for your plants, with light-source presets and plant-care guidance. • Share Lux Meter with a friend right from Settings. • Histogram overlay is now on by default, plus a clearer lux / foot-candle switch and various refinements.
MoreYes, Lux Meter contains advertisements. This is indicated by the 'hasAds' flag in the application data.
Lux Meter uses camera-based reflective metering, following the ISO 2720 photographic standard. For best results, calibrate once against a reference and use consistent lighting conditions.
Yes, Lux Meter works 100% offline. It does not require an account, tracking, or network connection to function.
Lux Meter is currently supported on iPhone devices.
Lux Meter has an age rating of 4+.
The latest version of Lux Meter is 1.1, and it was last updated on August 19, 2026. The release date was July 22, 2026.
Lux Meter offers both spot metering, which focuses on the center of the camera's view, and average metering, which analyzes the entire frame.
Yes, you can save single readings or record sessions over time. These sessions can include notes and location tags, and can be exported as CSV files via the share sheet.
