Does it work with Outlook or iCal, or only Google Calendar?

Google Calendar is the native integration — appointments placed directly, availability read in real time, so no double-booking possible. For Outlook, Apple Calendar and the rest, the appointment arrives as a standard iCal invitation sent to your address: accept it and the slot lands like any invitation. The honest nuance: natively, the AI reads your Google availability to only offer genuinely free slots; via iCal, it's an invitation to accept, not a direct write. Many customers run hybrid — a Google Calendar dedicated to bookings, synced into Outlook.