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  3. Proton Calendar

Connect Proton Calendar

Privacy-first scheduling made simple

Proton Calendar is built for privacy. This guide will walk you through exporting a read-only ICS link from Proton and connecting it to Book that Meeting in under two minutes.

What You'll Need
  • An active Proton Calendar account
  • A Book that Meeting account (free to create)
  • 2 minutes of your time

Step-by-step guide

1

Open Proton Calendar Settings

Log into your Proton Mail account and navigate to Calendar from the app switcher. Then click the Settings icon (gear) in the sidebar.

2

Enable Calendar Sharing

Select the calendar you want to share from the list. Under the "Share" section:

  1. Toggle "Enable sharing" to ON
  2. Ensure "Share with anyone who has the link" is selected
  3. Set permissions to "Can view" (read-only)
Security Reminder
Keep this link private! Anyone with the URL can see your calendar events. Store it in your password manager.
3

Copy Your ICS Link

Once sharing is enabled, you'll see an ICS link. Click "Copy link" to copy it to your clipboard.

The link will look something like this:

Example ICS URL
https://calendar.proton.me/api/calendar/v1/url/...
4

Add to Book that Meeting

Now head to Book that Meeting:

  1. Go to Settings → Calendars
  2. Click "Add Calendar Source"
  3. Paste your Proton ICS link
  4. Give it a name (e.g., "Personal Proton")
  5. Choose a color for easy identification
  6. Click "Save"
5

Verify Sync

Check the availability preview in Book that Meeting. Your Proton events should now appear and block out time slots automatically.

You're all set!
Book that Meeting will now check your Proton calendar before showing available times to your guests.

Troubleshooting

Events not appearing?

  • Verify that "Enable sharing" is toggled ON in Proton Calendar
  • Check that permissions are set to "Can view" (read-only)
  • Try clicking "Refresh Calendar" in Book that Meeting settings
  • Wait up to 15 minutes for the initial sync to complete

Need to rotate your link?

If you suspect your ICS link has been compromised:

  1. Go back to Proton Calendar Settings
  2. Toggle "Enable sharing" OFF, then back ON
  3. Copy the new ICS link
  4. Update the URL in Book that Meeting

Timezone issues?

Make sure your timezone is set correctly in both Proton Calendar and Book that Meeting. Mismatched timezones can cause availability to appear incorrect.

Best practices

Use a Password Manager
Store your ICS link in 1Password, Bitwarden, or your preferred password manager. This keeps it secure and easy to rotate if needed.
Separate Calendars
Create separate calendars in Proton for work, personal, and shared events. Connect only the ones you want to influence your availability.
Regular Audits
Review your shared calendars quarterly. Disable sharing for calendars you no longer use with Book that Meeting.
Sync Frequency
Book that Meeting refreshes calendar feeds every 15-30 minutes. For instant updates, use the manual "Refresh" button.
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