[0x09]

I've done a similar thing with https://github.com/0x09/watch

It's extremely simple but it allows me to do things like plot a color coded calendar of app usage, which can provide very revealing info about things like productivity spikes and lulls or sleep schedules.

I have a companion Safari extension for tracking active tabs which I did not release since it seemed like such a niche and strange thing to use, but the main code to do that is simply https://gist.github.com/0x09/d1220a7b0a0bda64b4f542067cd43ec...