01
Start with the Seed Library
30 film/developer pairs, filterable by ISO, developer, and dilution. Your go-to combos are always a couple taps away.
$ ./chemclock --intro
ChemClock: Your Darkroom Timer, Chemistry, and Charts in One
Offline-first development timer with temperature compensation, dilution math, and printable cheat sheets—no account, no signal, just film.
$ cat about.txt
ChemClock is a process computer for home film labs. Kick the guesswork out of development by starting with a built-in library of 30 film/developer pairs, entering your chemistry's real temperature to get time adjustments, and building a step-by-step sequence with agitation nudges and voice alerts. All calculations happen on your iPhone—data stays in SwiftData, runs work on the Lock Screen, and one tap exports a red-light reference card for the darkroom.
$ ls ./features
02
Temperature-Compensated Times
Tell ChemClock the actual temperature of your chemistry and get a corrected development time using the standard adjustment formula.
03
Build Your Sequence
Assemble pre-soak, develop, stop, fix, rinse—set duration, agitation cadence, and an alert sound for every step. Reorder freely.
04
Dilution & Volume Math
Enter any dilution ratio and tank size (35mm, 120, 4x5) to get precise stock and water amounts, down to the milliliter.
05
Glanceable Live Run
Start a run and put your phone aside. The Lock Screen widget shows the current step and time remaining, with haptics and voice cues at every change.
06
PDF Cheat Sheet
Export a one-page, red-light-friendly reference card with your film, times, dilution, and agitation notes—perfect for taping to the wall.
$ ./screenshots --slideshow
$ ./stats --report
30+Seed Film/Developer Pairs
100%On-Device, Offline
4.8★Home Lab Photographer Rating
0Accounts or Ads
Illustrative marketing figures; not App Store metrics.