What appointment scheduling software integrates with Google Calendar and Outlook?

Several popular appointment‑scheduling tools connect to **both Google Calendar and Outlook (Microsoft 365/Office 365/Exchange)** so bookings stay in sync and you avoid double‑booking.

Common options include:

- **Calendly** – Connects with Google Calendar plus **Office 365, Exchange, Outlook, and iCloud**; calendar integrations are available even on the free tier.[8]

- **Koalendar** – Integrates with **Google Calendar and Outlook**, automatically syncing bookings across both calendars to prevent double‑bookings.[8]

- **ScheduleOnce (OnceHub)** – Listed among free tools that “automatically sync your appointments with Google Calendar,” and supports G Suite, Office 365, Exchange, Outlook, and iCloud calendar integrations.[8]

- **Appointlet** – Also in the same group of tools that sync with Google Calendar and offer calendar integrations with Office 365/Outlook and others.[8]

- **Picktime** – Supports Google Calendar and Microsoft calendars as part of its free appointment‑scheduling feature set.[8]

- **TIMIFY** – Appointment booking and resource‑scheduling software that offers 1‑ or 2‑way sync with **Google Calendar and Microsoft Office 365/Outlook/Exchange**.[4]

- **CalendarBridge** – Real‑time calendar sync plus scheduling pages; supports **Google Calendar and Microsoft 365/Outlook personal accounts** and checks availability across up to four connected calendars.[6]

All of these let invitees book time via a link or booking page while keeping events synchronized to both Google and Outlook‑based calendars.