DevProCo vs Darkroom Timer

DevProCo is a precise development process timer for analog photographers — whether you're developing B&W film, color negative (C-41), slide film (E-6), or darkroom prints (RA-4). FEATURES • Guided step-by-step development sessions with automatic agitation reminders • Text-to-speech announces each step and agitation — keep your hands in the tank • Hands-free voice control: say "next" to advance steps • Automatic chemistry volume and dilution calculator • Built-in process library with pre-configured recipes (Rodinal, DD-X, C-41, RA-4) • Create and save your own custom processes • Share processes with other DevProCo users via QR code • Screen stays on during active sessions • Supports English, German, Spanish and French

The chart says 7:30 at 20°C. Your water says 21.5°C, and your stock developer is on its sixth film. This app exists for exactly that moment: it moves the published time to YOUR conditions and then walks you through every step of the run. It is not a licensed time database. It is an engine on top of YOUR recipes — and it works for black-and-white, C-41 and E-6 alike. HOW THE ENGINE WORKS • You enter a recipe: film, developer, dilution, and the published time from the data sheet. A small starter catalog compiled from public manufacturer sheets is included, with the source noted on every row. • Temperature: an exponential model consistent with the published compensation curves moves the chart time to the temperature you actually measured. At 22°C, reading the chart flat would overdevelop by about 16%. • Chemistry age: every bottle keeps its own ledger. Reused stock slowly exhausts, so the timer quietly adds the per-use extension — and tells you when a mix has reached its capacity or its shelf life. • Dilution: pick your tank, get the exact millilitres of developer and water to pour. • Push or pull a stop or two; the time follows. IN THE DARK • A step timer for the whole run — develop, stop bath, fix, wash, or the C-41/E-6 sequence — with agitation cues and a loud chime at every hand-off. • Safelight mode turns the entire screen red-on-black and keeps it awake. No white flashes in the darkroom. • Each step waits for you: pour, then start the clock. Pause, skip or bail out and save half a run — your call. WHAT YOU GET • A Lab screen with the whole time-vs-temperature curve for the selected recipe, today's corrected time, and the bottle ledger with per-bottle fatigue. • A session log: film, developer, temperature, applied time, push/pull, rolls. • Trends: day streak, films this week and this month, film stocks tried, and a monthly calendar of sessions and fresh mixes. • Challenges every day, week and month, plus 90+ badges for the habits that make consistent negatives — hitting the temperature, retiring spent bottles, finishing the wash. HONEST ABOUT WHAT IT IS The times are calculations, not gospel. They derive from your recipe's published figure with a model consistent with the manufacturers' own compensation charts — sanity-check a new recipe against the current data sheet before a roll you care about. Everything works offline, stays on your device, and asks for no account. °C or °F, your choice. The maths is the same underneath. SUBSCRIPTION Film Timer Pro is offered as a monthly auto-renewing subscription, or as a one-time lifetime purchase. Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours prior to the end of that period. You can manage and cancel your subscriptions in your Apple Account settings after purchase. Terms of Use: https://doesonejob.com/devtank/terms/ Privacy Policy: https://doesonejob.com/devtank/privacy/