CalcuLight

Intuitive Light Meter App

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

New! Swipe the exposure combination scale to see alternative exposure values in real time! Improved low light metering accuracy. CalcuLight is a powerful and intuitive light meter app designed for today's film photographers who want more advanced metering capabilities than what a handheld light meter can offer. METERING MODES Center Weighted: Classic center focused metering (approximately 30 degree field of view), similar to vintage film cameras. 3D Matrix: Full frame averaging for tricky scenes. Uses your iPhone's extensive 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: Per shot exposure adjustment in full, half, or third stops. ISO, shutter, and aperture (Pro) values are available in full, half, or third stop increments. ZONE SYSTEM VALUE DISPLAY (Pro) When enabled, displays Zone System value overlay, showing the current zone from O 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) and timestamp. Notes area will be pre-populated with captured values in Calculated metering mode. Easily 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 MULTI-LANGUAGE SUPPORT English, 简体中文, 繁體中文, 日本語, 한국어, हिन्दी, Русский, Deutsch, Français, Español, Português, Nederlands FREE vs PRO We designed CalcuLight to focus on simplicity and ease of use. The FREE version is completely ad-free and will satisfy over 90% of film shooter's needs when it comes to exposure metering. Free version features: Center Weighted metering 3D Matrix metering Shutter Priority metering EV compensation Single metering mode Theme switch Pro version: All free version features Spot metering with adjustable area Calculated metering Aperture Priority metering Vintage camera shutter speed options Zone System overlay Live histogram Log book with optional GPS location recording Continuous metering mode Global EV offset Exposure settings range limits Experimental features (lens switch) 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 (cancel any time); or $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

  • 5.0
    out of 5
    2 Ratings

New Exposure Combination Scale Display! The main readout now shows a scale of equivalent exposures instead of a single pair. Your current setting sits in the middle, underlined, with nearby combinations on either side so you can see at a glance that 1/125 at f/5.6 gives the same exposure as 1/250 at f/4. • Swipe across the values to scroll through combinations • Tap any combination to jump straight to it • Combinations your camera can't reach are flagged • Computed values now follow your own stop increment: a full-stop aperture setting gives full-stop apertures, even with the shutter set to ⅓ stop • More reliable Remember Settings restore when the app launches • Improved metering speed and smoother dial control • Layout fix for the bottom controls on smaller screens • Improved low-light accuracy • cd/m² readings have been corrected to the ISO 2720 standard.

Version 1.2.0

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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Dark Interface

    Information

    Seller
    • Li Fan
    Size
    • 41.5 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.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © Li Fan
  • Developer Website
  • Privacy Policy
  • License Agreement

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