Darkroom Toolkit

Process film and print in the darkroom, without the math.

Darkroom Toolkit is a reference library and set of utilities for film processing and darkroom printing. Browse hundreds of photochemistry formulas, run step-by-step development timers with official manufacturer dev times, and handle common calculations – all in one app.

WHY DARKROOM TOOLKIT? • One app instead of separate dev chart, formula, and printing calculator apps • Primary features are free: official processes, recipes, and all calculators included • Lifetime Pro unlock ($9.99) for saving favorites, custom workflows, and to support the project

FILM DEVELOPING • Pre-configured timers for manufacturer-recommended film + developer combinations • Multi-step processing with audio alerts • iOS Live Activity: see your timer on the lock screen • Low light / safelight theme for working in the dark

FORMULAS & CHEMISTRY • Extensive darkroom cookbook: developers, toners, lith, alt process, and more • Enter your target volume and every ingredient amount scales automatically • Dilution and solution strength conversion utilities

DARKROOM PRINTING • f-Stop printing calculator: exposure sequences and test strip times • Print resizing calculator: new exposure times when changing print size

PRO FEATURES (one-time purchase) • Save favorite processes and formulas • Create and edit custom recipes and processing timers • Sync your workflows across devices

Whether you're developing your first roll of black and white film, mixing chemistry for cyanotype, or dialing in enlarger exposures, Darkroom Toolkit keeps you consistent.

Download free. Upgrade once, yours forever.