Oh no, I might be about to build a tiny web app. I'm massively out of date on that sort of thing, but I think I might be able to do what I want with a single self contained HTML file that could be opened in a browser from the user's local computer, so I'm going to try to make it that way first and see how it goes since some people consider the data this would work with to be sensitive and it's better if nobody has to trust that I'm not looking at it (not that I want to).