Calendrz

If you juggle a work Google Calendar, a personal Outlook calendar, and maybe a freelance or side-project calendar, you know the pain: you accept a meeting in one account and accidentally double-book yourself in another. Calendrz solves this automatically.

Calendrz connects to all your Google and Microsoft calendar accounts and mirrors your availability across them in real time. When an event appears in one calendar, Calendrz creates a "hold" marker in your other calendars to block that time. When the event moves or gets cancelled, the hold updates or disappears. No manual effort, no browser extension, no shared calendar permissions needed — it just works in the background.

Calendrz also supports MCP (Model Context Protocol), so AI assistants like Claude and ChatGPT can see your unified availability across all accounts and help you find free slots, schedule meetings, or avoid conflicts. A generous free tier lets you get started immediately, with paid tiers for power users who need more connected accounts and advanced features.