Calendrz

Calendrz mirrors availability across connected calendars so busy time in one place is reflected in the others. It is built for people who manage more than one calendar and want to avoid double bookings.

Setup centers on linking Google Calendars in one place, with no limit on how many can be connected. Once connected, Calendrz reads busy events in real time and creates lightweight blocker events across the other calendars. It describes this as availability mirroring rather than a copy or sync, and says the mirrored blocks keep scheduling tools seeing accurate availability. The service also removes or updates blocker events when an event is canceled or moved, and it lets users choose which calendars mirror each other, set blocking direction, and define working hours so personal time is not blocked off-hours.

Calendrz also works with Claude and ChatGPT through the Model Context Protocol. From a natural-language conversation, those assistants can ask about availability, trigger a sync, manage connected accounts, or query all calendars at once. The site says it can trigger availability mirroring by voice and that secure OAuth 2.1 is used with no API keys, while Google and Microsoft credentials are not exposed to the AI assistant.

It is presented as a web service, with signup and setup described as taking about two minutes. The site offers a free account option and says users can connect calendars, choose rules, and let Calendrz handle the rest for free.