📸ExposureLab

ExposureLab — Professional Photography Toolkit

A comprehensive toolkit for photographers covering ND filters, exposure equivalents, film reciprocity, golden hour planning, and astrophotography. Designed for field work and studio use, with a special Night Mode for preserving night vision.

🔒 Fully Offline • Complete Privacy

ExposureLab works completely offline — no internet connection required for any feature, including Golden Hour calculations. Your settings, presets, and location are never stored, logged, or transmitted anywhere. No login, no account, no cloud sync.

Tools

🌅 Golden Hour Planner PRO NEW

Plan every light phase of the day — astronomical dawn, nautical dawn, blue hour, sunrise, golden hour, solar noon, and their evening counterparts — calculated on-device for your exact GPS location. Sunrise time is free; all other phase times require Pro. Typically accurate to ±1 minute.

Times are for photographic planning only. Not for navigation, aviation, or safety-critical use. Actual conditions depend on weather and terrain.

🌄 ND Filter Calculator FREE

Calculate adjusted shutter speeds for ND filter stacks. Stack multiple filters (ND2 through ND1000) and get instant results. Includes an integrated countdown timer with haptic and sound alerts. Save filter combinations as presets.

⚖️ Exposure Converter FREE

Find equivalent exposures at the same EV. Adjust aperture, shutter speed, or ISO and instantly see matching settings. Full ISO 50–102400 and ƒ/1.0–ƒ/32 range with Pro.

🎞️ Film Reciprocity Calculator FREE

Reciprocity failure corrections for 70 professional film stocks — Kodak, Ilford, Fujifilm, CineStill, Harman Phoenix, Lomography, and more. Includes an integrated countdown timer. 4 stocks free; full library with Pro.

🌌 Astrophotography Calculator FREE

Calculate maximum shutter speed to prevent star trails using the 250 Rule, 300 Rule, and the advanced Best Rule. The Best Rule accounts for your specific lens aperture and sensor pixel size. Supports 11 camera sensors including Sony, Canon, Nikon, and OM System.

Inspired by the work of Frédéric Michaud and the astrophotography community.

🎬 Film Explorer PRO

Browse all 70 film stocks with reciprocity formulas, preview corrections interactively, and discover films by category. Color, B&W, Slide, and Cinematic filters with full search.

💾 Presets Manager FREE

Save filter stacks, timer settings, and astrophotography camera/lens combinations. Free users get 1 preset per tool; Pro unlocks unlimited saves across all tools.

Free vs Pro

All core calculation tools are free. ExposureLab Pro is a one-time purchase — no subscription, no recurring fees — that unlocks everything permanently.

✅ Free

  • ND Filter Calculator + timer
  • Exposure Converter (standard ISO & aperture range)
  • Film Reciprocity — 4 film stocks + timer
  • Astrophotography Calculator (250 / 300 / Best Rule)
  • Golden Hour — Sunrise time
  • 1 saved preset per tool
  • Night Mode
  • Keep Screen Awake during long exposures
  • Works completely offline
  • No login required

👑 Pro PRO

  • Golden Hour Planner — all 11 phase times
  • 70 Film Stocks — full professional library
  • Custom Film Stocks — create films with your own reciprocity formula
  • Film Explorer — browse, preview, and search all stocks
  • Full ISO & Aperture Range — ISO 50–102400, ƒ/1.0–ƒ/32
  • Unlimited Presets — ND, film, and astro
  • Astro Presets — save camera/lens combos
  • Educational Guides — reciprocity failure and star trail prevention

One-time purchase · Lifetime access · All future updates included

Why ExposureLab?

🔴 100% Offline

Every calculation — including Golden Hour solar times — runs on-device. No internet needed, ever.

🔒 Zero Data Collection

No account, no analytics, no tracking. Your location, settings, and presets never leave your device.

🌙 Night Mode

Ultra-dark interface with red accents to preserve night vision during astrophotography and night shoots.

📱 iPhone & iPad

Adaptive layouts designed for both iPhone and iPad with full multitasking support.

⚡ Instant & Accurate

Real-time calculations with professional-grade accuracy. No waiting, no connectivity issues.

💎 Fair Pricing

Core tools free forever. One-time Pro purchase — no subscription.

Perfect For

  • Landscape Photographers — ND filter stacking, long exposure timing, golden hour planning
  • Astrophotographers — star trail prevention with multiple calculation methods
  • Film Photographers — reciprocity failure corrections across 70 film stocks
  • Golden Hour Chasers — precise blue hour, golden hour, and twilight times for your location
  • Long Exposure Artists — precise timing and exposure equivalents
  • Photography Students — learn exposure relationships hands-on
Download on the App Store