Ask HN: What do you use to track events and create reminders?

I've found the combination of Etar (https://f-droid.org/en/packages/ws.xsoh.etar/) and Calendar Notifications (https://f-droid.org/en/packages/com.github.quarck.calnotify/) on my Android to work really well for tracking events and creating reminders.

That combo, however, really isn't going to scale well for 'business' reminders.

Seems like a good use case for Zapier...seems like a simple "If this then that" type recipe where you could set up an email/Slack/SMS reminder in X days or on a specific date.

Or just create a calendar invite.

Google calendar is an obvious answer, but I'd be happy to know how many people actually use it.