Proton Calendar
End-to-end encrypted calendar from Swiss privacy company Proton, with a free plan.
- Verified facts
- 4 of 4
- Alternatives ranked
- 5
- Approved reviews
- 0
- Visits sent from here
- 0
About Proton Calendar
Proton Calendar is the calendar in Proton's privacy suite, alongside Proton Mail, Drive, VPN and Pass. Event details such as titles, descriptions, locations and participants are end-to-end encrypted, so Proton cannot read them, and the company is based in Switzerland under Swiss privacy law. It supports multiple calendars, sharing with other Proton users or via links, invitations to people outside Proton, importing from Google or other ICS sources, subscribing to external calendars, and appointment booking pages on paid plans. A free account includes the calendar with limits on the number of calendars, and paid Proton plans raise limits and bundle the other Proton apps. It runs on the web, iOS and Android, and on Mac, Windows and Linux through Proton's desktop apps. The encryption means some conveniences are missing: third-party calendar clients can't sync directly over CalDAV, and integrations with other productivity tools are limited compared with Google Calendar.
Best for: Privacy-minded people and teams who want encrypted calendars, ideally with Proton Mail.
Pros and cons
What works
- End-to-end encrypted event details
- Swiss jurisdiction and open-source apps
- Free plan, bundled with Proton Mail on paid plans
Why people leave
- No direct CalDAV sync with third-party clients
- Fewer integrations than Google Calendar
- Best value only if you use other Proton apps
Top Proton Calendar alternatives
See all 5- 1
Tuta Calendar66.5Another encrypted calendar with open-source apps and a free tier, based in Germany.
- 2
Google Calendar62.6Far more integrations and sharing, if encryption isn't a priority.
- 3
Fossify Calendar59.6Local-only open-source Android calendar with no internet access.
- 4
Zoho Calendar57.2Free hosted calendar with business features, without Google.
- 5
KOrganizer55.3Open-source desktop calendar you can point at your own CalDAV server.
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Proton Calendar: common questions
Is Proton Calendar free?
Proton Calendar has a free plan and paid plans. Free plan: Yes (checked on Proton Calendar's own site).
Is Proton Calendar open source?
Yes.
What platforms does Proton Calendar run on?
Proton Calendar is available for Web, iOS, Android, macOS, Windows and Linux.
What are the best alternatives to Proton Calendar?
The highest-ranked Proton Calendar alternatives right now are Tuta Calendar, Google Calendar and Fossify Calendar. See the full ranked list for pricing, platforms and verified facts.