FilmDev: Darkroom Film Timer

FilmDev is a darkroom-safe timer built for home film developers working with black-and-white or C-41 chemistry. It runs multi-stage timers for develop, stop, fix, wash, and more, with a running screen that stays pure black and deep red only - never a flash of white light that could fog your film.

WHY THE SCREEN MATTERS MORE THAN ANY OTHER FEATURE
Most darkroom timer apps default to a normal bright interface, and some switch to "dark mode" that still leaks white pixels somewhere on the screen - a stray icon, a status bar, a button outline. In a darkroom or under safelight, that's enough to fog film you've spent hours shooting. FilmDev's running screen is pure black and deep red only, fullscreen and immersive, with no exceptions.

HOW IT WORKS
- Build a recipe: name it, log the film stock, developer, dilution, and temperature, then add stages (develop, stop, fix, wash, hypo clear, rinse, or a custom stage you name yourself)
- Set agitation per stage: none, continuous, or interval-based with your own initial and interval timing
- Start the timer and the screen goes fully dark-safe - large countdown, haptic and beep agitation cues, auto-advance between stages, with pause, skip, and exit always available
- A temperature compensation preview adjusts black-and-white develop time based on a standard time-temperature factor - clearly labeled as a guide, not a certified formula
- Save every session to a development log with film, developer, notes, and a 5-star rating, so you can track what actually worked

EIGHT STARTER RECIPES, HONESTLY SOURCED
FilmDev ships with 8 starter recipes pulled from manufacturer datasheets - some confident anchors, some flagged as approximate and worth verifying. Every recipe, starter or your own, carries a reminder banner: check your own chemistry and conditions before you trust a time blindly. Film is expensive and your process varies - FilmDev gives you a starting point, not gospel.

YOUR RECIPES, YOUR DATA
Recipes are stored on your device and can be exported to JSON and imported back - to a new phone, a backup, or shared with another photographer. There's no cloud account and nothing required to sign in.

FREQUENTLY ASKED QUESTIONS
Q: Will the screen really stay completely dark during the timer?
A: Yes. Once a timer session starts, the display switches to pure black with deep red text and controls only - fullscreen, immersive, with brightness forced down. This is the one thing FilmDev was built to get right.

Q: Are the built-in recipes guaranteed accurate?
A: No, and we say so directly. They're sourced from manufacturer datasheets, but developer age, dilution habits, water temperature, and personal taste all shift real results. Treat every time as a starting point and adjust from your own test rolls.

Q: How many recipes can I save without upgrading?
A: Starting accounts can save 3 custom recipes. Pro removes that limit entirely, along with ads, and adds export/import, development log CSV export, and advanced log stats.

Q: Does the app show any ads during a developing session?
A: Never. Banner ads, when shown at all, only appear on non-timer screens like the recipe list or settings - the running timer screen shows no ads at all by design.

Q: Do I need an account or internet connection?
A: No. Everything works fully offline with no account of any kind.

Q: Can I use this for both black-and-white and C-41 color development?
A: Yes. Build a recipe with whatever stages your process needs - develop, stop, fix, wash, blix, stabilizer - FilmDev doesn't assume one chemistry over another.

FILMDEV PRO
A single one-time purchase removes the recipe limit and all ads, and unlocks JSON export/import, CSV export of your development log, advanced log statistics, and recipe duplication. No subscription, ever - pay once and it's yours.