A darkroom in your pocket: analog tools on iPhone
Last updated 2 June 2026
If you shoot and develop film, the math around it, print times, dilutions, push and pull, reciprocity, usually lives on scraps of paper. EditMe includes a real darkroom companion on iPhone (part of EditMe Pro) that turns those into proper tools: f-stop print timing, a temperature compensation curve, push/pull, a dilution mixer, and reciprocity correction.
The tools
- F-stop print timing with a test-strip generator, where each stop doubles the exposure time, the way enlarger printing actually works.
- Temperature compensation for developer time when your chemistry is warmer or cooler than standard.
- Push and pull calculators, with separate factors for black-and-white and C-41.
- Dilution mixer that parses notations like 1+9 or 1:9 into real volumes.
- Reciprocity-failure correction with a built-in film table for long exposures.
Free editor, Pro darkroom
The photo editor and film-negative inversion in EditMe are free. The analog darkroom companion is part of the optional EditMe Pro subscription, alongside tools like the full tone curve and 16-bit export. Everything runs on the device, with no cloud and no account.
How it compares
| Task | EditMe darkroom | By hand |
|---|---|---|
| F-stop print timing | Built-in | Manual |
| Push / pull factors | Built-in | Lookup |
| Dilution from 1+9 notation | Built-in | Mental math |
| Reciprocity correction | Film table | Manual |
| On the device | Yes | n/a |
Frequently asked questions
What is f-stop print timing?
It is a way of setting darkroom enlarger exposures in stops rather than raw seconds, where each stop doubles the time. EditMe includes it with a test-strip generator.
Does EditMe help with film development math?
Yes. The darkroom companion includes temperature compensation, push and pull, a dilution mixer, and reciprocity-failure correction with a film table.
Is the darkroom toolkit free?
The photo editor and film inversion are free. The analog darkroom companion is part of the optional EditMe Pro subscription.
Does it need an internet connection?
No. EditMe runs entirely on the device, with no cloud and no account.