DisparaTimer vs Darkroom Companion

DisparaTimer is a mobile app that, when connected to a Raspberry Pico W/WH, can control the exposure time of a photographic enlarger using a power relay. The physical setup is inexpensive and easy to assemble. DisparaTimer has two operation modes. The first is a traditional timer mode, where you set a specific time for each exposure. The second is designed for creating test strips with constant fractional step increments over a base time. On iPad (iPadOS 17 and later), DisparaTimer includes a landscape-only notes panel that lets you add photos or images of your test strips and make handwritten or visual annotations directly on them.

Free film developing times and a multi-step darkroom timer for black-and-white film. Built-in development chart for common film and developer combinations, dilution calculator, reciprocity calculator and a red night mode. No subscription, no ads. Whether you are developing your first roll or your thousandth, it keeps the whole process in one place. FREE — NO SUBSCRIPTION, NO ADS • Multi-step timer — developer, stop bath, fixer, wash, wetting agent — with sound and haptic agitation cues • Night (red) mode that preserves your dark adaptation • Development time calculator for bath temperature and push/pull (± stops) • Built-in database of times for common film and developer combinations • Dilution calculator — how much concentrate, how much water • Celsius or Fahrenheit, whichever you think in • Reciprocity calculator for long exposures • One custom recipe and the last three developments in the log DARKROOM PRO — one-time unlock, no subscription • Unlimited custom recipes and custom process steps • Chemistry log — tracks expiry and exhaustion, warns you before you pour dead fixer • Unlimited development history • Data export and import Times are indicative. Verify them against the manufacturer datasheet before real use — the app reminds you as well. PRIVACY The app collects only anonymous usage statistics — which screens are opened and which features are used — so it can be improved. It does not send your recipes, log, notes or anything else you type into it, and it uses no advertising identifiers.