About this app
Actinic is a fast, fully offline exposure calculator built for film photographers — a film exposure calculator that also solves the one thing most light-meter apps skip: reciprocity failure on long exposures. Dial in a Sunny 16 reading or your own aperture, shutter, and ISO, then read the full wheel of equivalent exposures instantly — no camera permissions, no accounts, no network calls, ever. Shooting past a second? Pick your film stock — Tri-X, HP5 Plus, T-Max, Portra, Acros, and more — and Actinic corrects your exposure time for reciprocity failure using published manufacturer data, so your night shots and long exposures come out right the first time. Included: • Full-stop exposure wheel with Sunny 16 quick-set • Reciprocity calculator with 3 built-in film stocks • Save up to 3 camera + film presets Actinic Pro unlocks the full 12-stock reciprocity library, unlimited saved presets, and third-stop precision to match modern camera dial clicks exactly — one-time purchase, yours forever.
Latest release
What’s New
Fixed minor issues and improved overall stability.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 15, 2026 · 1:53 PM Free
Screenshots
