FilmDev vs Stop Bath

FilmDev is a darkroom-safe multi-stage timer built for home film developers — B&W and C-41, push/pull, and beyond. ■ Multi-stage auto-advance timer Set up develop, stop, fix and wash stages once. FilmDev counts each stage down and auto-advances to the next — no fumbling for a stopwatch in the dark. ■ True darkroom-safe screen Running timer screen is pure black with a deep red display only — no white pixels, no accidental flash. Fullscreen immersive, safe for your eyes and your film. ■ Haptic + beep agitation cues Feel and hear when it's time to agitate — configurable haptic pulses and beep cues so you don't need to watch the screen. ■ Wall-clock accurate, even backgrounded Timing is based on real elapsed time, not a fragile in-app counter — lock your phone or switch apps and the timer stays accurate when you come back. ■ Temperature compensation Adjust develop time for your actual chemistry temperature using a standard B&W time-temp factor. A guide, not a guarantee — always verify against your own testing. ■ Your own recipe library Build and save your own recipes — film stock, developer, dilution, temperature, and every stage. Starter recipes are included from manufacturer datasheets, clearly marked "verify before use." Your recipes, your times. ■ Develop log Log every roll you develop — recipe used, film, developer, notes and a rating — so you can track what worked. ■ FilmDev Pro (one-time purchase) Unlock unlimited recipes, remove ads, and export/import your recipe library as JSON. One-time purchase, no subscription. ■ 8 languages, private by design No account, no cloud. Everything — recipes and logs — stays on your device.

A timer for people who develop their own black-and-white film. Pick your film, developer and temperature, and Stop Bath lays out the whole process — pre-soak, develop, stop, fix and wash — timing each step and prompting you when to agitate. The timer covers black-and-white processes only. The negative viewer works with both black-and-white and colour negatives. TIMES FROM THE DATASHEETS Development time depends on the film, developer, dilution and temperature. Every time in Stop Bath comes from a manufacturer datasheet, and the source shown on screen opens the original document so you can check it yourself. Where no official time exists, Stop Bath does not invent one. It says so plainly and offers an external reference for further research. BUILT FOR AN ACTUAL DARKROOM • Clear current-step and remaining-time display • Agitation reminders at the right moments • Swipe between processing steps • Drag the progress bar within the current step • Full safelight-red mode • Screen stays awake while timing • Celsius and Fahrenheit support SEE THE RESULTS Photograph a negative, place the sampling box over the frame and tap Invert. Fine-tune black point, white point, gamma, contrast and red/blue balance, then save the result to Photos. The negative viewer is designed for quick inspection and selection; it does not replace a dedicated film scanner. PRIVACY Stop Bath works entirely offline: • No account or sign-in • No ads or analytics • No personal data collection • Images are processed only on your device • Photo Library access is add-only and cannot read your library English and Chinese. Designed for iPhone and iPad.