Show HN: Calendar0 – System tray app for natural language scheduling

[alessandro-a]

Hey HN,

Calendar0 is:

- A system tray app that lets you view your calendar instantly without opening a browser

- An AI assistant to manage everything in your calendar using natural language commands

- Smart contact resolution which automatically converts names to emails using Google Workspace and checks all attendees' availability before booking

- One-click meeting access for smart notifications that let you join meetings instantly

I am using Gemini 2.5 Flash for NLP. Built in Electron. Trying to keep it under ~100ms response time for most commands. It was unexpectedly challenging to parse ambiguous time references ("next Monday" vs "this Monday").

Would love to have your feedback!

Thank you!