CalcuLight
Intuitive Light Meter App
About
This app provides advanced light metering for film photographers, offering multiple metering modes and exposure control options. It helps users achieve precise exposures for their shots, with features like Zone System display and a log book for tracking. A free version is available, with an optional Pro upgrade for more advanced tools.
What's New in CalcuLight
1.5.0
October 27, 2026
Version 1.5.0 of CalcuLight include new features to help you know whether a scene's dynamic range will fit on your film stock: Scene Brightness Range (Pro) Calculated mode now shows the range between your darkest and brightest metered points, not just the average. That spread is what decides whether a scene fits on film at all. Set your film type in Settings and CalcuLight warns you when a scene is close to the limit, or past it, and by how many stops. Slide (narrowest latitude), colour negative and black and white (widest latitude) each get their own latitude. Bracket Logging (Pro) Turn on "Bracketing" and each log entry records the frames either side of your metered exposure, so your log matches the roll you actually shot. CalcuLight varies whichever value it calculates and leaves the one you chose alone: the aperture in Shutter Priority, the shutter in Aperture Priority. Bracket frames appear on the entry and in CSV, JSON and text exports. Also in this update: • Settings shows the version and build you have currently installed • Removed system permissions CalcuLight never used, including microphone and storage access • New Help sections covering scene range, film latitude and bracketing • All 12 languages updated and synchronized
MoreSubscriptions & In-App Purchases
CalcuLight
A Powerful & Intuitive Light Meter For Film Photography
FAQ
What metering modes does CalcuLight offer?
CalcuLight offers Center Weighted and 3D Matrix metering in the free version. The Pro version adds Spot metering for precise measurement and Calculated metering for averaging multiple points, ideal for high contrast scenes and Zone System workflows.
Can CalcuLight help with the Zone System?
Yes, the Pro version of CalcuLight includes a Zone System value display overlay. In Calculated metering mode, each metering point shows its own zone value, providing advanced exposure control for Zone System users.
What are the exposure control options in CalcuLight?
CalcuLight provides Shutter Priority metering where it calculates aperture. The Pro version also includes Aperture Priority metering, allowing you to set aperture and calculate shutter speed. EV compensation is available for per-shot adjustments.
Does CalcuLight have a log book?
The Pro version of CalcuLight features a comprehensive log book. It saves every reading with exposure data, metering mode, GPS location, and timestamp. You can also export your shooting log as CSV or JSON.
How much does CalcuLight Pro cost?
You can try the Pro version for free for 14 days. After the trial, you can choose a monthly subscription for $0.99 USD or a lifetime access purchase for $14.99 USD to unlock all Pro features.
Is CalcuLight available on Android?
CalcuLight is currently available for iOS devices, including iPhone, iPad, and iPod. The app supports both portrait and landscape orientations.
How often is CalcuLight updated?
The latest version of CalcuLight is 1.2.0, last updated on August 1, 2026. The app is actively maintained, with new features and improvements likely to be released regularly.
What is the age rating for CalcuLight?
CalcuLight has an age rating of 4+. This indicates that the app is suitable for users of all ages and does not contain mature content.
