Now with Outdoor, Indoor, and Photo modes. Track every reading with 7-day chart, calibrate, compare, share results as image, export CSV.
Lux Light Meter turns your iPhone into a precise illuminance meter with four purpose-built modes — and now keeps a full history of every reading you take.
FOUR MODES
• Auto — radial gauge with closest reference shown live.
• Outdoor — focused 0.001 to 100,000 lx with moonless night, twilight, overcast, full daylight, direct sun references.
• Indoor — focused 10 to 10,000 lx with corridor, living room, kitchen, office, reading desk, drafting, surgical references.
• Photo — EV @ ISO 100 readout plus suggested shutter speed at f/2.8.
WHAT'S NEW
• Measurement History — every reading is auto-saved with a 7-day trend chart and insights like "+12% vs your 7-day average".
• Notes & Favorites — add a note ("kitchen window 3pm") and star to any saved reading.
• Compare Mode — pick two saved readings and view the difference side by side.
• Calibration Offset — fine-tune your sensor in ±1 lx steps.
• Share Result — share your current lux as an image.
• CSV Export — share all your measurements as CSV for spreadsheets.
CORE FEATURES
• Precise ambient light measurement (lux)
• Kalman-smoothed sensor readings
• Min/Max/Avg tracking with elapsed time
• Log-scale range bar in Outdoor and Indoor modes
• EV exposure value for photographers
• Microphone calibration
FOR PHOTOGRAPHERS · INDOOR GARDENERS · ELECTRICIANS · STUDIO ENGINEERS · OFFICE ERGONOMICS · INDUSTRIAL DIAGNOSTICS
Available in 14 languages.
Ratings & Reviews
4.8
out of 5
4 Ratings
Ads no longer interrupt you mid-task. Anything full-screen now waits until you have finished what you were doing, and the app stops showing a blank pause where an ad failed to load.
Version 1.0.27
The developer, Kyu-Hee Jang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Kyu-Hee Jang
Size
57.9 MB
Category
Utilities
Compatibility
Requires iOS 16.4 or later.
iPhone Requires iOS 16.4 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
