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.
The orchestration engine is built to be provider-agnostic.