I don't know if this is something anyone would be interested in but I'm currently in the process of building a overwatch sensitivity calculator in React.
You input your dpi, sensitivity, main hero and some other stuff and it tells you what sensitivity you should try based on what pro Overwatch players use on the same hero.

I've basically got a massive json file with all the pros on it, their dpi, sensitivity, main heroes etc and if you select Widowmaker for example it goes through the json file, finds all the pros that use widow then makes an average for dpi and sensitivity out of all the results it finds then takes those values and averages it against the values you provided so you get given a value right in-between what the pros use and what you currently use.

I don't really know if it's something anyone would really want/need but I'm making it anyway to add to my portfolio haha.

I don't have anything ready for you to play around with yet but I'll provided some screenshots. Let me know what you think. If there's any interest I can provide updates.