Luxwell: Spot Light Meter EV
Sunny 16 Exposure Calculator
About
This app acts as a pocket light meter for your iPhone, measuring EV, lux, and foot-candles. It helps photographers set shutter, aperture, and ISO accurately for both film and digital cameras. A free Sunny 16 calculator is also included.
What's New in Luxwell
1.01.090802
September 15, 2026
In-App Purchases
$19.99
Lifetime
Luxwell Pro Lifetime
Developer apps
FAQ
What is Luxwell?
Luxwell is a pocket light meter for iPhone that measures reflected, incident, and spot EV live from your camera. It helps you set shutter, aperture, and ISO for accurate exposure in the field. The core metering and Sunny 16 calculator features are free to use.
Does Luxwell have ads?
No, Luxwell does not contain advertisements. The app is free to use with optional in-app purchases for advanced features.
What are the features of Luxwell Pro?
Luxwell Pro is an optional one-time unlock that includes a zone system scale on the live meter, manual 0.1-stop calibration, a shoot log with export, a film ISO helper with reciprocity warning, and extra camera presets. Live metering remains free.
How accurate is Luxwell compared to a handheld meter?
Luxwell uses the iPhone camera to estimate scene brightness. While useful for exposure decisions, results are not laboratory-grade and may differ from a calibrated handheld meter. Manual calibration options are available.
What devices does Luxwell support?
Luxwell is currently supported on iPhone devices. It was last updated on 2026-09-15 with version 1.01.090802.
How do I restore my Luxwell purchases?
You can restore any previous purchases for Luxwell Pro features by navigating to the Settings section within the app. This ensures you retain access to unlocked functionalities.
What is the Sunny 16 calculator in Luxwell?
The Sunny 16 calculator is a free feature within Luxwell that provides a fast outdoor starting point for exposure settings. You can pick an ISO for a shutter at f/16, or select shutter and aperture to get a suggested ISO.
What is the age rating for Luxwell?
Luxwell has an age rating of 4+, making it suitable for a wide range of users. The app focuses on providing utility for photographers.
