Notifications on Calendar Changes (opens in new tab)

I released a new project recently which scratched an itch I've had for a while. I subscribe to a number of calendars, and I wanted to receive notifications about any changes to those calendars, as they happen. My new project to solve this problem is calendiff. It's open source, self hosted, and the idea is that you run it on a schedule from cron or a systemd timer etc. You point it at an ICS URL, and the first time it runs, it just collects the latest snapshot. On subsequent runs, it identifi...