Analogue Wonderland, a magical source of all things film photography related in the UK, has an interview with Jon Mided of the DigitalTruth Massive Dev Chart posted. Every B&W photographer who develops film themselves should be well acquainted with this Chart.
Apps are available for iOS and Android with the Chart builtin, along with a timer that offers temperature compensation and the ability to store previous film and developer combinations.
The interview is worth the read, and the Massive Dev Chart should be a tool in every darkroom practitioner's kit.
