I bet some of you have the same problem - you've got a family calendar, a work calendar, and you somehow want to keep them aligned so you're not getting overbooked.
I used to use Reclaim, but I wasn't happy with how configurable it was. One day I was talking tech over beers with a friend, and we thought it'd be cool to model this as a pure function - so that's what we did. What started as a PoC is now CalendarPipe.
Not surprisingly, my current company is pretty strict about OAuth apps reading email, so I couldn't connect it directly to my work account. So I figured we could sync calendar invitations over email instead - I haven't seen another tool take this approach.
There's a free tier if you want to poke at it. Feedback very welcome, including the harsh kind - and I'm happy to go deep on how it works under the hood (the gate functions, the email delivery, the sandboxing) if anyone's curious.