Expose — Exposure Calculator

The exposure tool that thinks like a photographer.
Dial in your exposure. See equivalents instantly. Calculate ND filters. Correct for film reciprocity failure across 17 film stocks. No guesswork, no wasted frames.
Expose is a fast, focused calculator for film photographers, landscape shooters, and anyone who shoots manual. Three linked dials — shutter, aperture, ISO — give you equivalent exposures at a glance.
No subscriptions. No ads. No account. Pay once, shoot forever.
FEATURES
- Linked exposure dials — change one value, the others adjust to maintain EV
- Lock any dial to control which value compensates
- ND filter calculator with stacking (ND2 through ND100000)
- Film reciprocity correction for 17 stocks including Portra, Tri-X, HP5, Acros, Ektar, and Delta
- Sunny 16 quick-reference chart for metering without a meter
- Save up to 20 exposure presets for your common setups
- Dark mode and light mode — readable in the field or the darkroom
BUILT FOR PHOTOGRAPHERS WHO KNOW THEIR CRAFT
- No tutorials. No onboarding. Launch and shoot.
- No network connection required — works anywhere
- No data collected. Zero permissions. Your tool, your privacy.
- Under 2 MB — lighter than a lens cap