SlowLightMeter vs PhotoCore

As a film photographer, I wanted an accurate yet simple reflective and incident light meter. After trying several, I decided to build my own. This light meter continuously measures light, so it requires minimal interaction during a shoot. To avoid accidentally changing film ISO, I added an ISO lock. And since I shoot often with my Hasselblad, I made EV values a core feature of the app.

PhotoCore is the essential tool for photographers who want to master natural light. Know exactly when to shoot, anywhere in the world. REAL-TIME SOLAR LIGHT Get precise times for sunrise, sunset, golden hour, blue hour, and civil twilight — calculated for your GPS location or any city in the world. Plan your session with dual times: local time and destination time side by side. PHOTOGRAPHIC LIGHT QUALITY PhotoCore analyzes the sun's physical intensity, real cloud cover, and gives you a photographic light quality index in real time. It automatically detects the best windows of the day for shooting and alerts you when conditions are ideal. WEATHER FOR PHOTOGRAPHERS Humidity, wind, and UV index interpreted for photography. Know if haze will soften the light, if wind will affect long exposures, or if UV will create unwanted haze. PROFESSIONAL CALCULATORS • Depth of Field — Calculate hyperfocal distance, near and far limits for Full Frame, APS-C, and Micro 4/3 • ND Filters — Convert shutter speeds with up to 12 stops of filtration • Interactive Solar Compass — Visualize the sun's arc and plan the direction of light in your scene • Shadow Simulator — Calculate shadow length and direction based on sun elevation SEASONS & ANNUAL PLANNING See how light changes throughout the year: daylight hours, sunrises and sunsets month by month for any latitude. PHOTOGRAPHY GLOSSARY 20 essential concepts explained: golden hour, solar elevation, depth of field, ND filters, solar compass, and more. All in 7 languages. APPLE WATCH Check the most important data directly from your wrist with native watchOS app and complications. HOME SCREEN WIDGET Access today's data without opening the app. 7 LANGUAGES Español, English, Français, Deutsch, Português, Русский, 中文. 100% PRIVATE Your location is calculated on-device. No data is ever sent to external servers.