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SPECIFICTION
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Proton Calendar

proton.me

Free plan iOSAndroid
Visit proton.me
Spec score 8.7 #28 of 194 in Calendar apps

What it is

Proton Calendar is a calendar service for managing events, invitations, and recurring schedules on Android and iOS. Event titles, descriptions, locations, and invited people are protected with end-to-end or zero-knowledge encryption. A free Proton account costs nothing and allows up to 3 calendars. Paid Proton Mail plans allow up to 25 calendars, with calendar sharing by link to other calendar services on the web. Users can send invitations and add events from Proton Mail; appointment scheduling updates availability and adds confirmed meetings. The service supports scheduling links and video meetings, and notifications can arrive through desktop browsers or mobile devices. Calendar import and export are available on paid plans. Subscriptions purchased through proton.me renew automatically, and users can switch plans at any time; upgrades receive prorated credit. Proton is incorporated and headquartered in Switzerland and follows Swiss privacy laws.

Spec sheet

Free plan
YesRead 20 Sep 2026 · proton.me
Mobile apps
ios and androidRead 20 Sep 2026 · proton.me
Headquarters
Plan-les-Ouates, Geneva, SwitzerlandRead 28 Sep 2026 · proton.me
Founded
2014Read 28 Sep 2026 · proton.me
Appointment scheduling
Proton Calendar automatically updates availability and adds confirmed meetings.Read 28 Sep 2026 · proton.me
Automatic renewal
Subscriptions purchased through proton.me renew automatically.Read 28 Sep 2026 · proton.me
Business users
Proton Calendar is trusted by over 100,000 business users.Read 28 Sep 2026 · proton.me
Calendar sharing
Calendar sharing is included on paid plans and can use links to other services.Read 28 Sep 2026 · proton.me
Calendar sync
one_wayRead 20 Sep 2026 · proton.me
Company location
Proton AG is located in Plan-les-Ouates, Geneva, Switzerland.Read 28 Sep 2026 · proton.me
Encrypted details
Titles, descriptions, locations, and invited people are encrypted.Read 28 Sep 2026 · proton.me
Event encryption
Events are protected with end-to-end or zero-knowledge encryption.Read 28 Sep 2026 · proton.me
Event management
Users can create, edit, delete, and manage recurring events and invitations.Read 28 Sep 2026 · proton.me
Event notifications
Users can receive notifications through desktop browsers or mobile devices.Read 28 Sep 2026 · proton.me
Free account
Users can create a free account to use Proton Calendar.Read 28 Sep 2026 · proton.me
Free calendar limit
The free plan allows up to 3 calendars.Read 28 Sep 2026 · proton.me
Import and export
Users can import calendars and export calendars on paid plans.Read 28 Sep 2026 · proton.me
Mail integration
Users can send invitations and add events directly from Proton Mail.Read 28 Sep 2026 · proton.me
Paid calendar limit
Paid Proton Mail plans allow up to 25 calendars.Read 28 Sep 2026 · proton.me
Paid sharing
Paid users can share calendars with a link to other calendar services on the web.Read 28 Sep 2026 · proton.me
Plan switching
Users can switch plans at any time; upgrades receive prorated credit.Read 28 Sep 2026 · proton.me
Scheduling links
YesRead 20 Sep 2026 · proton.me
Shared calendars
YesRead 20 Sep 2026 · proton.me
Support contact
General support is available through Proton help and support and [email protected].Read 28 Sep 2026 · proton.me
Swiss privacy
Proton is incorporated and headquartered in Switzerland and follows Swiss privacy laws.Read 28 Sep 2026 · proton.me
Video meeting support
YesRead 20 Sep 2026 · proton.me

Plans and prices

Free Free billed monthly 3 calendars Essential Proton Calendar features are available with a free Proton account. Read 28 Sep 2026 · proton.me
Mail Plus Price not published 25 calendars · 1 user Read 20 Sep 2026 · proton.me
Unlimited Price not published 25 calendars · 1 user Read 20 Sep 2026 · proton.me
Paid Priced on request Paid Proton Mail subscribers get additional calendar features. Read 28 Sep 2026 · proton.me

Every Proton Calendar plan and price →

Strong points and limits

Strong points

  • Event details and invitees are encrypted.
  • Free plan includes up to 3 calendars.
  • Scheduling updates availability and adds confirmed meetings.
  • Mail integration supports invitations and event creation.
  • Notifications are available on mobile and desktop browsers.

Limits

  • Free plan is limited to 3 calendars.
  • Calendar sharing by link is for paid plans.
  • Import and export are available on paid plans.
  • Platforms listed are Android and iOS.

Who it suits

It suits people who want encrypted calendars on Android or iOS, including those who manage invitations and recurring events. Users who need more than three calendars or sharing by link need a paid Proton Mail plan.

Verdict

Proton Calendar combines encrypted event details with scheduling, invitations, and Proton Mail integration. Its free plan has a three-calendar cap; paid Proton Mail plans add capacity and sharing options.

Where Specifiction places it

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