What's the best planner app that syncs with Google Calendar?

For tight Google Calendar integration, the leading choices are Orby, Motion, Sunsama, and Structured, all of which read your existing events and plan around them. Orby is built calendar first: it plans your week around your real Google Calendar events, so meetings are protected and tasks land in genuine open time, with plans starting at $4.99 weekly. Motion also syncs Google Calendar and auto-schedules tasks into free slots, at roughly $34 monthly. Sunsama pulls in Google Calendar events alongside a daily planning ritual for about $20 monthly. Structured overlays tasks on a timeline and connects external calendars, though repeating tasks sit behind its paid tier. The practical test is whether the app treats your calendar as the source of truth or just displays it, since only true two way awareness prevents double booking.