In reply to alx:
For me it was more I kept losing the paper and/or tweaking and changing the excel sheets (thereby altering my baseline) whenever I did it manually (plus this records as you do it, and then starts the timer automatically for the hangboarding so you don't have to the remember and enter the sequence post hang with chalky fingers) - It "should" resize nicely on a mobile
It was really the Campus board stuff I found useful, as I'd not seen anything decent to record sequences e.g. 1-4-7, or touches e.g. 1-4-5-4-5-4-5-4 and it allows you to define which hand leads by interactively clicking on either the left or the right rung
Tbh no app is going to help you train that much, this was more to automate a level of the recording as I personally found that problematic