# ashfurrow/C-41

C-41 is an application to help people develop film at home by providing a series of "recipes" for photographers to use.

Repository: https://github.com/ashfurrow/C-41
Canonical: https://ross.abutalabs.com/products/c-41
Language: Objective-C
License: MIT
License Family: permissive
Archived: true
Last push: 2021-04-27T02:03:11+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4638, "days_push": 1955, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2044, forks 358 (observed 2026-08-28T04:06:08.776704+00:00)

## What it is
C-41 is an iOS application that helps photographers develop film at home by providing step-by-step 'recipes' for different film stocks and chemicals. It also serves as a reference example demonstrating Core Data, unit testing, ReactiveCocoa, and the Model-View-ViewModel pattern in Objective-C.

## Use cases
- develop film at home with timed step-by-step instructions
- look up development recipes for C-41 color film stocks
- time each chemical bath while developing film
- learn MVVM and ReactiveCocoa patterns in an iOS app
- study a well-tested Core Data iOS application

## When to choose
- you develop film at home and want guided timing recipes on your iPhone
- you want a real-world Objective-C example of MVVM with ReactiveCocoa and Core Data

## When to avoid
- you need an Android or web-based film development timer
- you want a modern Swift/SwiftUI codebase
- you need support for black-and-white or slide film processes beyond the included recipes

## Facets
- artifact type: application
- maturity: maintenance
- function: gui, developer-tools
- domain: photography, developer-tools, education, mobile-development
- platform: -
- tags: film-development, darkroom, photography-recipes, core-data, mvvm, reactivecocoa, ios, mobile, swift, objective-c

## Member repositories
- ashfurrow/C-41 (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:08.776704+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:58:03.403650+00:00, confidence not recorded.
  - readme: https://github.com/ashfurrow/C-41 (fetched 2026-08-28T04:06:08.776704+00:00, sha 135cfd685216)
- Data as of 2026-08-30T08:39:29.467469+00:00.