Your day stays yours
Privacy policy
Last updated November 4, 2026
Privacy first. 100% free.
No subscriptions. No hidden costs. No ads or tracking. Calendar Checker saves its copy of your calendar on your computer, not on a server run by the developer.
Here's what that means in everyday terms, and what you can control.
What stays on my computer?
Calendar Checker saves information in Chrome on the computer where you use it:
- The Google accounts and calendars you've connected, including their names and email addresses.
- A saved copy of events and shared busy times. Event details can include titles, dates, locations, guests and descriptions.
- Your preferences, reminder history, snoozes and any notification sounds you add.
- Changes you've made that haven't reached Google yet, plus basic troubleshooting information that leaves out private event details and sign-in credentials.
This saved information helps the calendar work offline. It isn't sent to the developer or copied through Chrome's cloud preference sync. Closing the popup does not delete it.
Why does it connect to Google?
To show your existing calendars and save the changes you ask for. You choose each Google account to connect and approve access to your identity, calendar list, events and shared busy times. The extension does not read your Gmail messages or automatically connect accounts just because you're signed in elsewhere.
Sign-in and calendar requests go directly to Google. If you invite a guest or add Google Meet, the details needed to do that are sent to Google too. Your original events remain in your Google accounts. Calendar Checker does not pass your calendar through a separate company server or send it to the developer.
Google handles your sign-in; Calendar Checker does not ask for or store your Google password. Chrome manages some sign-in access. Other temporary access is held in memory rather than saved with your calendar data. Google's and Chrome's own account handling follows their policies.
Can I keep sensitive descriptions out?
Yes. In Settings → Sync & offline storage, turn on Exclude event descriptions. Descriptions are included by default; turning this on stops downloading them and removes previously saved copies, including copies used when editing or reviewing a change.
Titles, times, locations, guests and other event details are still saved. If you write a description yourself, it stays with your unsent changes until Google confirms the save, so your work isn't lost. Changing another part of an event doesn't remove its description from Google.
The saved-month controls don't turn offline storage off: even at zero past and zero future months, the current month remains, and viewing the calendar can save a three-month browsing window.
What about notifications and sounds?
Alerts use Chrome and your computer's notification system, so event details may appear on your screen. Settings lets you limit what's shown or turn alerts off. Sounds you add stay on your computer and are not uploaded. Reminders you've set in Google Calendar are handled separately by Google.
Is there tracking, advertising or a catch?
No. Calendar Checker is 100% free to use, with no subscriptions or hidden costs. It contains no advertising or tools that track how you use the extension. Your data is not sold, and your calendar information is not sent to the developer or a data collection service.
What if I change my mind?
You can pause an account to stop updates while keeping its saved information. Removing an account deletes that account's saved calendar information and reminder history from the extension. You'll need to send or discard unsent changes first.
Removing an account here does not sign you out of Google or remove your original Google events. You can also withdraw the app's access in your Google Account settings.
Uninstalling the extension clears its local data, including changes not yet sent to Google. It doesn't delete your Google calendars. Removing saved information is not a guarantee that older copies in computer backups are erased.
Does this website track me?
This website adds no analytics, tracking cookies or forms that collect your information. It is hosted on GitHub Pages, so GitHub handles ordinary website visits under its privacy statement. That is separate from the calendar information saved by the extension.
Still have a question?
Ask a question on GitHub. Please leave out passwords, sign-in information and private event details. The project is open source, so anyone can look at how it works.