Calendar0
Calendar0 is a menubar calendar application that provides instant calendar access with AI-powered scheduling assistance, allowing users to view and manage their schedule with one click without switching between browser windows.
https://www.calendar0.app/?ref=producthunt
Product Information
Updated:Oct 11, 2025
What is Calendar0
Calendar0 is a desktop menubar calendar application designed to streamline calendar management and eliminate the time-consuming process of switching between windows to check schedules. It integrates with popular calendar services like Google Calendar and Microsoft Outlook, offering a seamless solution for both personal and professional calendar management. The app lives next to your computer's clock, providing immediate access to your full schedule without the need to open a browser.
Key Features of Calendar0
Calendar0 is a desktop menubar calendar application that provides instant access to your calendar without opening a browser. It features AI-powered scheduling assistance, natural language commands for managing events, smart contact resolution, and seamless integration with Google Calendar and Microsoft Outlook. The app aims to save users 20 minutes daily on calendar administration by providing quick one-click access to schedules and simplified meeting management.
One-Click Calendar Access: Access your full schedule instantly from the system tray/menubar without opening browser tabs or multiple windows
AI-Powered Scheduling Assistant: Natural language processing allows users to create and modify events by simply typing commands like 'lunch with Ania today' or 'move my 1:1 to tomorrow'
Smart Contact Resolution: Automatically finds and adds contact email addresses from your contacts and workspace directory without manual searching
Private Calendar Management: Keeps meeting titles private with no cloud sync requirements, maintaining security of sensitive calendar information
Use Cases of Calendar0
Remote Team Coordination: Quickly check availability and schedule meetings across time zones while screen sharing without exposing private calendar details
Executive Time Management: Efficiently manage packed schedules and respond to meeting requests without disrupting ongoing work
Project Management: Easily coordinate team meetings and reschedule sessions using natural language commands without manual calendar juggling
Pros
Saves significant time on calendar administration
Intuitive natural language interface
Privacy-focused design
One-time payment lifetime access option
Cons
Limited to macOS and Windows platforms
Some calendar integrations (like Apple Calendar) still in development
Requires separate purchase for full AI features
How to Use Calendar0
Download and Install: Download Calendar0 app for your operating system (macOS or Windows) from calendar0.app/download
Access Calendar: Click the Calendar0 icon next to your system clock in the menubar/system tray to instantly view your schedule
Connect Calendar Account: Link your existing calendar account (Google Calendar or Microsoft Outlook) to sync your events and contacts
View Schedule: Click the menubar icon anytime to see your full schedule without opening browser - your meeting titles stay private
Create Events Using AI: Type natural language commands like 'lunch with Ania today' and the AI will automatically find contacts and schedule events
Manage Existing Events: Use commands like 'Move my 1:1 to tomorrow' to reschedule meetings - AI checks everyone's availability automatically
Join Meetings: Get 5-minute meeting warnings and join video calls with one click directly from the menubar
Keyboard Navigation: Use keyboard shortcuts to manage your calendar without touching the mouse for increased efficiency
Calendar0 FAQs
No, Calendar0 keeps your meeting titles private and doesn't require any cloud syncing that would concern IT.
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