Okay, the reason I want to do this is because I saw this blog post. Stephen Wolfram collects all sorts of data about himself, including 10+ years of keystrokes. I am interested in doing some of this myself. I've searched Google, but most of the keylogger apps are for Windows, and the rest are not quite what I want. I'd like an app that can record what time of day I'm pressing keys, and record which keys I'm pressing more often. But I have no interest in recovering the text itself. If it provided an inbuilt way of visualizing the data, that would be nice, but I'd by happy with something that exported it to a universal formal like csv. I know there are some ethical concerns around keyloggers, so rest assured I am installing this solely on my own computer, which no one else uses.