I am close to releasing an iOS Camera app (yes another one lol) called Invisible Camera. It's a minimal app that works the way I like to shoot with my Fujifilm camera: focus on what I see, quickly apply a look / filter with a slider and shoot. The processing pipeline reduces the default color science applied by iOS to result in a more pleasant look.
You can join the beta https://testflight.apple.com/join/LEJk313o
When I can, I am also working on some features for https://midicircuit.com Beta here - https://testflight.apple.com/join/pNyAUEac