This project has arguably been my most successful, having been released to the iOS App Store. Despite a very low amount of users, the ratings have been high and it appears to be one thing well. The idea came from me trying to learn to improve my drawing and painting skills, I soon discovered how important values are but couldn't find a good way to train myself to see them. This app built upon common techniques such as greyscaling images, but took it further so specific values can be selected for easy viewing.
Takeaway from project: Having clear success criteria is very motivating, in this case it was simply publish to the app store. Even just one review from someone you don't know on a side project is extremely encouraging. Learned SwiftUI.