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