Safelight Darkroom Timer vs ZoneCalc

Safelight Darkroom Timer helps analog darkroom printers calculate exposure changes, run timed print workflows, and save the setup that worked. Use the darkroom-friendly timer for Focus, Expose, and Process timing with large controls, red/amber/green display themes, optional haptic feedback, completion sound, and keep-screen-on behavior when enabled. Turn one base exposure time into a stop-based table with the F-Stop Calculator. Use free 1/4 and 1/3 stop steps, send a result to the timer, or run a test strip one exposure at a time. Save print sessions with base exposure, stop step, paper, filter grade, developer, and notes so you can repeat or adjust your best darkroom prints later. Search, edit, delete, repeat, and use saved sessions from the Sessions screen. Use the Print Process Timer for expose, develop print, stop bath, fix, and optional wash steps. Manage darkroom metadata presets for paper, developer, and filter grades. Safelight Pro unlocks unlimited saved sessions, advanced stop steps, Dodge & Burn planning, memory banks, run plans, and CSV/Text export and sharing. Important: Safelight is a darkroom-friendly display and timing utility. It is not a flashlight, photo editor, AI app, lab ordering service, hardware enlarger controller, or guarantee that a phone screen is safe for every photographic paper or film. Always test your own paper and darkroom conditions. Privacy Policy: https://hearthmesa.com/apps/safelight/privacy Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support: https://hearthmesa.com/apps/safelight/support

ZoneCalc — Zone System Calculator ZoneCalc is a precision tool for large format, medium format and 35 mm photography following Ansel Adams' Zone System. Built for photographers who work with a spot meter, develop their own negatives, and want full control over exposure and tonal placement. METERING In Classic mode, enter the shutter speed for the deepest shadow with detail (Zone II) and the brightest highlight with detail (Zone VIII). ZoneCalc returns the shutter speed for Zone V — 18 % middle gray — the exposure you set on the camera. Multi mode accepts any number of measurement points across the scene. The app auto-assigns each point to a zone; drag pins on the zone strip to express your creative placement intent. RECIPROCITY For exposures above one second, the Schwarzschild effect is corrected automatically: t_corr = t_nom ^ p, using the film-specific exponent. The corrected camera time appears directly in the result card. The shutter speed list extends to 30 minutes. Films with reciprocity data: Ilford HP5+, FP4+, Delta 100/400, Kodak Tri-X, T-Max 100/400, Kodak Portra 160/400/800, Leica Monopan. N-RATING & DEVELOPMENT ZoneCalc compares the scene's dynamic range against the film's usable latitude and proposes a development adjustment — N−2 through N+2. For each film, concrete times are shown for common developers: D-76, Rodinal, HC-110, XTOL, ID-11, T-Max Dev — with dilutions per Massive Dev Chart and manufacturer recommendations. HISTORY & EXPORT Every calculation can be saved with a note and the chosen developer; two entries can be compared side by side. The complete result — shutter speed, reciprocity, N-rating and development times — exports as an image for the darkroom or for sharing via AirDrop, message or mail. DESIGN The interface follows the visual language of classic Leica instruments: monospaced typography, warm amber accent, hard edges instead of rounded corners. Fully localized in English and German, all-dark throughout — optimized for darkroom and field use. ZONECALC PRO Classic two-point metering with Zone V calculation and the zone strip are free. The one-time Pro upgrade unlocks: — Multi-point metering with interactive zone assignment — Reciprocity correction and N-rating — Development recommendations with times per developer — Save, compare and image export One app, no subscriptions, no data collection. All calculations run locally on device.