KeyFit is a little keylogger that shows you which keys you actually hit all day, and I mean that in the useful way, not the creepy way. It sits in the tray, counts your keypresses, and turns them into a ranking and a heatmap over your keyboard layout.
The current version is 1.1.0, built with Tauri 2.0, and it runs on Windows and Mac. You can pick your keyboard size, 45, 60 or 75 percent, and filter the stats by date range or by app, so you can see what your fingers do in the DAW versus everywhere else.
The part I like is that it only records dates in one-day chunks, so there is no way to reconstruct a password from it. The developer still flags it plainly on the page: it is a keylogger, handle it with care. Fair enough.
If you have ever wondered why your S key looks more worn than the rest, this will confirm it in about five minutes.
Product page: https://jun-murakami.web.app/apps/keyfit