When I reach 150 patrons, I will make it my first priority to release the roast colorimetry app that I described here. The laptop application will be available for a small price, from which past Patreon donations will be deduced (e.g. if you donated 2$ for six months, 12$ will be deduced for you). Based on my experience with developing the grind size app, I expect this will take me between 25 and 40 hours of work, which will be spread across my free time at a rate of 3-4 hours per week.