I tried making a shiny app about 2 years ago, but I never really got it online for some reason. But after talking to a friend I tried again and it was surprisingly easy! Maybe I just got a lot better using R or the server infrastructure got a lot easier to use.
Anyway here you can play around with it.
I still could improve a few things UI-vice and maybe add more options. But honestly for a prove of concept it is good enough and I am quite happy how well it works. And I really like the results.