Supported Features
-
Dark Interface
CalcuLight
Intuitive Light Meter App
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
A powerful and intuitive light meter for film photography: Spot, matrix or calculated metering with location enabled log books. Free core features, no ads ever!
CalcuLight is a powerful and intuitive light meter app designed for film photographers who use manual focus cameras without a built in meter, or who want more advanced metering capabilities than their camera can offer.
METERING MODES
Center Weighted
Classic center focused metering (approximately 30 degree field of view), similar to vintage film cameras.
Matrix
Full frame averaging for evenly lit scenes. Uses EXIF data for fast and accurate readings.
Spot (Pro)
Measure a precise 5% area of the frame. Tap anywhere to position the metering point.
Calculated (Pro)
Tap up to five areas and receive an averaged exposure reading. Ideal for high contrast scenes and Zone System workflows.
EXPOSURE CONTROLS
Shutter Priority
Set your shutter speed. CalcuLight calculates the aperture.
Aperture Priority (Pro)
Set your aperture. CalcuLight calculates the shutter speed.
EV Compensation (EV±)
Per shot exposure adjustment in full, half, or third stops.
ISO, shutter, and aperture values are available in full, 1/2, or 1/3 stop increments.
ZONE SYSTEM (Pro)
When enabled, displays Zone System value overlay, showing the current zone from 0 to X alongside your reading.
In Calculated mode, each metering point displays its own zone value for advanced exposure control.
LIVE HISTOGRAM (Pro)
Real time RGB histogram overlay to detect clipped highlights and blocked shadows before you shoot.
Toggle between combined RGB, red, green, and blue channels.
LOG BOOK (Pro)
Save every reading with:
Full exposure data
Metering mode
GPS location - Choose precise or general
Timestamp
Notes - Notes are pre-populated with captured values in Calculated metering mode
Export your shooting log as CSV or JSON. Ideal for tracking exposures alongside film rolls.
DISPLAY OPTIONS
Light readings in EV, lux, and cd/m²
Light and dark themes optimized for personalized readability
Portrait and landscape support
12 LANGUAGES
English
简体中文
繁體中文
日本語
한국어
हिन्दी
Русский
Deutsch
Français
Español
Português
Nederlands
FREE vs PRO
Both versions are fully functional.
Free version features:
Center Weighted metering
Matrix metering
Shutter Priority
EV compensation
Single metering mode
Theme switch
Pro version will unlock:
All free version features
Spot metering
Calculated metering
Aperture Priority
Vintage camera shutter speed options
Zone System overlay
Live histogram
Log book with optional GPS location recording
Continuous metering
Global EV offset
Vintage camera shutter speed control
Exposure settings range limits
And more
Free version is ALWAYS good to have on your phone, in case your handheld or hot shoe mounted light meter fails. You can try Pro version at no cost for 14-days. After that, you can access the Pro version in two ways: Pay as you go for only $0.99 USD per month to access all Pro features; or pay $14.99 USD for lifetime access to all Pro features and future updates.
Privacy Policy:
https://calculight.ocutrain.com/privacy-policy.html
Terms of Service:
https://calculight.ocutrain.com/terms-of-service.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's New in 1.1:
• Dial controls: swipe across ISO, shutter, aperture, or EV± to scroll
through values like turning a real camera dial, with haptic feedback
• Faster settings: multi-option settings now open a quick dropdown
picker right where you tap
• Now FREE for everyone: light/dark theme switch, screen orientation
control, and overlay transparency adjustment
• Zone System value now displays beside the metering point in the
camera view
• Calculated mode log entries now record the averaged reading and
pre-fill notes with each measured point's EV and Zone value
• Redeem offer codes directly from Settings
• Vintage shutter modes now support speeds faster than 1/250 set
by "Fastest Shutter" range limit
• Improved subscription status detection: Pro unlocks reliably at
launch, after reinstalls, and after renewals
• Bug fixes and interface refinements
The developer, Li Fan, 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 Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Li Fan
- Size
- 41.4 MB
- Category
- Photo & Video
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- CalcuLight $14.99
- CalcuLight $0.99
- Copyright
- © Li Fan