# CalcuLight — Intuitive Light Meter App > Advanced light meter app for film photographers with multiple metering modes. (iPhone/iPad app by Li Fan.) - Source: https://appshunter.io/ios/app/calculight/id6758964459 (this page in markdown: same URL + `.md`) - Developer: [Li Fan](https://appshunter.io/developer/1876047115) - Category: Photo & Video, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 40 MB - Languages: American English - Released: 2026-06-12 - Data updated: 2026-08-06 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/calculight/id6758964459/reviews.md ## What is CalcuLight? 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 ## Key features - Center Weighted metering - 3D Matrix metering - Spot metering (Pro) - Calculated metering (Pro) - Shutter Priority metering - Aperture Priority metering (Pro) - Zone System overlay (Pro) - Log book with GPS (Pro) ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | CalcuLight | $0.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | CalcuLight | $14.99 | one-time | ## Frequently asked questions about CalcuLight ### 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. ## Version history (last 3 releases) ### 1.2.0 — 2026-08-01 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. ### 1.1 — 2026-07-11 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 ### 1.0 — 2026-06-12 No release notes. ## Apps similar to CalcuLight | App | Rating | Price | Category | | --- | --- | --- | --- | | [Apperture: Film Simulation](https://appshunter.io/ios/app/apperture-film-simulation/id6761656883) | — | Free | Photo & Video | | [View Camera Log](https://appshunter.io/ios/app/view-camera-log/id6784085857) | — | Free | Photo & Video | | [Fotio: Film Exposure Meter](https://appshunter.io/ios/app/fotio-film-exposure-meter/id6778361850) | — | Free | Photo & Video | | [Illumi the Lightmeter](https://appshunter.io/ios/app/illumi-the-lightmeter/id6761808084) | — | Free | Photo & Video | | [Grain Story](https://appshunter.io/ios/app/grain-story/id6766061193) | — | Free | Photo & Video | | [Sprokbook](https://appshunter.io/ios/app/sprokbook/id6760282935) | — | Free | Photo & Video | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-06.*