Do I have to connect Google Calendar?

No, it's completely optional. Arch Calendar comes with its own built-in calendar, so you can manage your tasks, events, and notes entirely inside Arch Calendar without connecting an external calendar. Everything is ready to use as soon as you create your account.

If you already keep your schedule in Google Calendar, you can connect it whenever you need to. There's no limit on how many Google Calendars you can connect, so you can bring in your work and personal accounts together and see them all in one view.