Tamer Designs

CalendarBell

An unmissable calendar alarm for your PC.

CalendarBell sits in your Windows system tray, watches your Google calendars, and when an event is about to start it takes over the screen with a full-screen alert and an alarm sound — over your game, your editor, or whatever else you were doing.

What it does

Syncs any number of Google calendars across any number of Google accounts.
Full-screen popup plus a looping alarm that pulls itself to the foreground.
Snooze, dismiss, or join a Meet, Zoom or Teams call in one click.
Starts automatically at logon and restarts itself if it ever stops.
Honours the reminders you already set in Google, or override them per calendar.

How it handles your data

CalendarBell runs entirely on your own computer. It asks Google for read-only calendar access, so it cannot change anything in your calendar, and it has no server of its own — your events are never sent anywhere. Credentials are encrypted on disk with the Windows Data Protection API, so only your Windows account can read them.

The full details are in the privacy policy.

Built to be auditable

CalendarBell is written in Python using only the standard library, with no third-party dependencies. There is no build step and no package supply chain — the entire application can be read top to bottom.