Proton Calendar
Beginner RecommendedThe best Google Calendar alternative is Proton Calendar. Encrypted calendar integrated with Proton Mail. The natural Google Calendar replacement.
Information verified on July 7, 2026
This topic is chapter 5 of the book
Replacing Google Calendar
Here, the big picture. In the book: the full method and the detailed walkthrough.
Description
Proton Calendar encrypts all your events end-to-end. It integrates natively with Proton Mail: invitations arrive in your inbox, reminders follow. The interface is clean and efficient. The free plan includes one calendar, the paid plan unlocks several plus sharing. It's the most direct Google Calendar replacement for Proton users.
My take
My fastest transfer: thirty minutes, stopwatch in hand. The limit to know before choosing: no sync with Apple Calendar or Thunderbird. I explain that trade-off in chapter 5.
Key features
- E2E encryption
- ICS import/export
- Proton Mail integration
- Reminders
- Web and mobile
- Free
Strengths
- + Even the provider can't read your data
- + Integrated with Proton Mail
- + Simple and clean interface
Weaknesses
- − Fewer features than Google Calendar
- − No CalDAV (limited sync)
- − Dependent on the Proton suite
Recommended for
- Proton Mail users
- Encrypted personal calendar
Proton Calendar vs Google Calendar: the comparison
| Criterion | Proton Calendar | Google Calendar |
|---|---|---|
| Price | Included with free Proton Mail. More calendars with paid plans. | Free |
| Targeted ads on your data | No | Yes (Google ad profile) |
| Source code | Open (auditable) | Proprietary |
| Migration difficulty | Easy (2/5) | — |
Comparison
Proton Calendar is the natural choice with Proton Mail: end-to-end encrypted, included with the account. Its limit: no CalDAV, so no sync with Apple Calendar or Thunderbird. Tuta Calendar is the category's other encrypted calendar.
Frequently asked questions
How much does Proton Calendar cost?
Included with free Proton Mail. More calendars with paid plans.
How do you switch from Google Calendar to Proton Calendar?
Estimated difficulty: Easy (2/5). ICS import possible. Fewer features than Google Calendar. Ideal if you already use Proton.
Who is Proton Calendar for?
Proton users seeking an encrypted calendar integrated with their email.