Calendar0

Calendar0 is an AI menubar calendar app for macOS and Windows. It is built around reducing calendar admin, with the page claiming it helps save 20 minutes daily and schedule meetings from the menubar in 3 seconds. The product is framed around avoiding double-booking, cutting down time spent checking availability, and keeping meetings and calendar changes moving without opening multiple browser tabs.

Its features include automatic conflict detection, smart scheduling, and protected focus time. Calendar0 can handle natural-language requests such as lunch with Sarah tomorrow or reschedule my 1:1 to tomorrow, then find a contact’s email, check attendee availability, and send the invite. It searches Google Contacts, Workspace, and Microsoft directory, works with partial names, checks conflicts for every attendee, and prevents double-booking across a team. It also shows personal, work, and shared calendars in one view, with syncing for Google and Microsoft calendars, instant availability across all accounts, and no switching between personal and work accounts.

The app supports bulk operations such as adding buffers between meetings, selecting multiple events to modify them at once, and rescheduling by dragging. Other listed features include keyboard shortcuts and global hotkeys, smart notifications with 5-minute warnings, and one-click joining of video calls. It is described as living in the menubar next to the clock, with no browser needed. Privacy details on the page say tokens are encrypted on the user’s computer, nothing is saved on the company’s servers, and the AI only knows what the user shares.

Calendar0 offers a free Starter plan with full calendar features, unlimited calendar providers, drag, resize, edit, RSVP, join video meetings instantly, event notifications, and 3 free AI chat commands. Paid options are Lifetime Access, billed once, and a Monthly plan; both include unlimited AI chat commands and all future AI improvements. The pricing copy also mentions a 14-day money-back guarantee for Lifetime Access and that the monthly plan can be canceled anytime.