The #1 light meter — plus zone system, DoF, reciprocity, rangefinder, magic hour, and 10+ pro calculators for film photography. Trusted by 400,000+.
The essential light meter app for film and digital photography. Turn your phone into a precision spot meter trusted by 400,000+ photographers worldwide.
PRECISION EXPOSURE METERING
• Spot meter with tap-to-focus exposure points
• Multi-point spot metering — pin and compare dynamic range
• Zone System metering — assign zones (0–X) to readings
• Exposure preview for compensation and ND offsets
• Volume button to start/stop metering
• Calibrated against professional Gossen and Sekonic meters
ZONE PLACEMENT CALCULATOR
• Place readings on zones, see target exposure instantly
• Grayscale swatches show how each reading renders
• Dynamic range warnings for high-contrast scenes
• Send directly to Bracket Calculator
AR RANGEFINDER
• Point at your subject, read distance in feet or meters
• Perfect for manual focus film cameras with no built-in rangefinder
• LiDAR precision on iPhone Pro (centimetre accuracy up to 5 m)
• ARKit scene tracking on all other supported iPhones
• Precise mode for the exact number; Zone mode for macro/near/mid/far
• Send readings directly into the Depth of Field Calculator
YOUR COMPLETE PHOTOGRAPHY TOOLKIT — 13 CALCULATORS
• Rangefinder — AR subject-distance measurement
• DOF — Hyperfocal distance, near/far focus limits
• Reciprocity — 40+ film stocks (Portra, Tri-X, HP5, CineStill, and more)
• Bracket Calculator — Exposure bracketing with custom steps
• Pinhole Calculator — Effective f-stop for pinhole cameras
• EV/LV Converter • White Balance • Bellows Factor
• Flash Guide Number • EXIF Reader • Angle of View
• Zone Placement • Sunny 16
GOLDEN HOUR & BLUE HOUR
• Sunrise, sunset, golden hour, and blue hour times
PROFESSIONAL FEATURES
• Custom ISO, shutter, f-stop ranges
• Half-stop and third-stop increments
• Shutter angle mode for cinematographers
• Live histogram • ND filter display
• Foot-candles and Lux • Exposure timer
SAVE & ORGANIZE
• Log exposures with GPS and notes
• Hardware profiles for your gear
• Export and reference past readings
Film SLR • Medium format • Large format • Pinhole • Digital mirrorless
50+ languages • Home screen and lock screen widgets • No internet required
Love this app, but it seems to be missing the sensor meter. I don’t know if I don’t see it, please help let me know.
Never used it, the moment I use it, ruins it.
Jaeed12
2 years of never using this app, the moment I'm going to use it...it is laggy, glitchy, never metered properly. I have proper sekonic lightmeter, but I have forget it the last two times of night photography. Those two times were enough show this app is not good...from now on, I may forget the camera, I may forget the lense or the tripod, but never the lightmeter because I can't trust this app. Never.
Developer Response
Hello! I've gotten a couple reports that something has changed in the last week or so. I haven't published a new version of the app so I am investigating. I will update here once I fix the issue.
Used to work great
Dsins_mk4
I’ve been using this app exclusively for many years and it has just tanked Every time I open the app it either won’t open the camera or won’t give me readings without restarting the app
Developer Response
Hello! I've gotten a couple reports that something has changed in the last week or so. I haven't published a new version of the app so I am investigating. I will update here once I fix the issue.
Please continue to update to match android app
MKIV_20v
This app has so much potential, it leaves a bit to be desired, let me tap to select the area of the screen I want to meter for. I would like better accuracy in metering for the shutter speed when the exposure is longer than 3 seconds . I used the app on android for 3 years and it was perfect
Developer Response
Hello! The iOS app has the same features as Android and actually has a couple extra minor features. Thanks for your patience!
• Add AR Rangefinder — measure subject distance for manual film cameras (LiDAR on iPhone Pro; ARKit on all others)
• Send rangefinder readings directly into the Depth of Field Calculator
• Add Multi-Point Spot Metering — long-press to pin and compare exposure readings
• Add Zone Placement Calculator — place readings on zones, see target exposure
• Add Bracket Calculator for exposure bracketing
• Add Pinhole Calculator for pinhole cameras
• Add Share as Image for social sharing
• Add Zone System metering for camera meter
• Add Exposure Preview for adjust and ND offsets
• Add 20+ new film stocks to reciprocity calculator
• Add volume button to start/stop metering
• Updated camera meter UI with icon controls
• Quick settings access from meter screens
• Refreshed settings design
• Bug fixes and performance improvements
Version 5.3.2
The developer, William Blaschko, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
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
William Blaschko
Size
31.8 MB
Category
Photo & Video
Compatibility
Requires iOS 15.0 or later.
iPhone Requires iOS 15.0 or later.
iPad Requires iPadOS 15.0 or later.
iPod touch Requires iOS 15.0 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
