DisparaTimer vs Film Development Assistant

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.

Film Development Assistant provides advanced features for every at-home photographic film developer! Reduce your risk of development issues by keeping track of your chemical batches and development sessions in the app. Our ever-evolving database of home development chemicals makes it easy to track the expiration dates of your mixed chemical batches based on the suggested shelf life from the manufacturer. Once you have your chemicals mixed, you can create sessions to track how many rolls/sheets of film you are developing, and the app will track the chemical usage for you so that you don't forget how much chemical capacity you have remaining! The visual progress indicators for your chemical batch freshness are a very useful tool for keeping track of your chemicals and making sure you either use them before expiration, or prevent yourself from using already expired or depleted chemicals. With each session, you can open a multi-stage timer to track the time for each stage of development. No more creating different timers by hand with the default timer app on your phone! And if you associate an existing chemical batch with each stage, the app will automatically adjust the development times of those stages based on the previous usage of your chemicals (or you can adjust the times manually). When you finish your sessions, you can take notes about how your session went so that you can learn from your home development process over time. You can keep track of the quality of the session and add your own notes to reference later.