Overview

PhotoMeterPro is a professional digital light meter for photographers. It uses the iPhone camera as a real luminance sensor via AVFoundation, calculates exposure (EV, ISO, aperture, shutter speed) based on the camera body and lens you select, and offers advanced AI features through a Cloudflare Worker backend with OpenAI.

What it is

• Native iOS app (SwiftUI + SwiftData), minimum iOS 17.0
• ~421 Swift source files, no third-party SPM dependencies
• Apple Watch companion via WatchConnectivity
• Mac Catalyst support via NavigationSplitView sidebar
• 11 languages: EN, DE, ES, FR, HI, IT, JA, PT-BR, RO, RU, ZH-Hans

Core user loop

• Select camera from catalog (150 bodies) → CameraFlowEngine
• Select lens with mount check (613 lenses, 20 mounts) → LensFlowEngine
• Meter live: SceneCaptureEngine → LuminanceEngine → MeterIntegrationEngine
• Adjust ISO, shutter, aperture for your gear
• Output: brand-specific formatting → BLE, QR, WiFi, or file export

Monetization

Free tier includes the four main tabs (Camera, Lens, Meter, Settings) with live metering. Pro subscription via StoreKit 2 unlocks Pro tools, AI advisors, CloudKit sync, and specialized metering modes. Pricing is shown by Apple in the App Store.