Skip to content
ToolGPA

Proton Calendar

End-to-end encrypted calendar from the maker of Proton Mail

Free plan · from $3.99/moCalendarChecked Oct 5, 20264.1 on the App Store
Visit proton.me
Proton Calendar, as pictured on proton.me
How Proton Calendar presents itself. Image from proton.me.

Proton Calendar report card

3.2GPA

Very good · out of 4.0 · graded Oct 9, 2026

Best for a calendar your provider can't read

Want a calendar where even the company running it can't see who you're meeting? That's Proton Calendar: titles, places and guests are encrypted before they leave your device, and it's free with a Proton account. The thing that sends people elsewhere is sharing. That and booking pages need a paid plan, and you can't buy Calendar on its own.

Who Proton Calendar is for

  • Great if you want your event details unreadable to the company storing them
  • Handy when you already use Proton Mail and want invitations sorted from the inbox
  • Good for privacy-minded teams moving the whole office onto Proton's business suite

Who Proton Calendar is not for

  • Skip it if you want to share a calendar for free, because sharing needs a paid plan
  • Tight if you're staying free and juggle more than 3 calendars
  • Not for you if you want to pay for a calendar alone, since the paid features come bundled with mail

Why Proton Calendar gets a 3.2

Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.

  • AValue for moneyMail Plus is $3.99 a month billed yearly ($47.88), which sits at the cheap end for calendars, and it comes with encrypted email, 15 GB and 10 addresses. The odd part: there's no Calendar-only plan, so you're buying mail either way.
  • BFree plan and trialFree gets you 3 encrypted calendars and invitations, with no time limit. But there's no calendar sharing and no booking page, and the desktop app is only a 14-day trial on a free account.
  • BFeaturesEnd-to-end encryption, repeating events with several reminders, imports from other providers and invitations handled inside Proton Mail. Solid basics. Sharing and booking are paid, though, and Mail Plus only includes 1 booking page.
  • CEase of use4.1 from about 1,500 App Store ratings, which is low for a calendar. On a computer you reach it through the Proton Mail app, not an app of its own.
  • APlatforms and integrationsWeb, Mac, Windows, Linux, iPhone and Android. It ties into Proton Mail and Proton Meet, and can subscribe to calendars kept on other services. The Linux app is labelled beta.

What these grades rest on. Graded from this listing, whose facts were read from Proton's own pages on 5 October 2026, and its App Store rating. Not based on using the product, and shorter than our full reviews. How we review and grade.

Make Proton Calendar? Put this grade on your site
Proton Calendar: 3.2 GPA on ToolGPA

Paste this where you want the badge. It links here and follows the grade if it changes. About badges

<a href="https://toolgpa.com/tools/proton-calendar#review"><img src="https://toolgpa.com/badge/proton-calendar.svg" alt="Proton Calendar: 3.2 GPA on ToolGPA" width="196" height="56"></a>

What is Proton Calendar?

Proton Calendar is an encrypted calendar from Proton AG in Switzerland. Event titles, descriptions, locations and attendees are end-to-end encrypted so that Proton cannot read them. It is included free with a Proton account, limited to 3 calendars; calendar sharing, booking pages and up to 25 calendars come with Proton's paid plans, since Calendar is not sold on its own.

Proton Calendar has a free plan. Paid plans start at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. See every plan

Good for

  • People who want event details kept unreadable to the provider
  • Existing Proton Mail users who want invitations handled in the inbox
  • Privacy-focused organizations standardizing on Proton's business suite

Worth knowing

  • Proton Free allows 3 personal calendars; Mail Plus and higher plans allow 25.
  • Calendar sharing and booking pages need a paid plan, and Mail Plus and Proton Unlimited include only 1 booking page.
  • Calendar has no subscription of its own: paid features come with Mail Plus, Proton Unlimited or a business plan.
  • Desktop use is through the Proton Mail app for Mac, Windows and Linux, a 14-day trial on free accounts; the Linux app is labeled beta.

Key features

End-to-end encrypted events
An event's title, description, location and attendees are encrypted on your device. Events received from people on other calendar services are stored with zero-knowledge encryption.
Appointment booking pages
Publish a booking page that shows only the times you choose and syncs with your calendars to prevent double bookings. Confirmed meetings can include a Proton Meet link. Paid plans only.
Calendar sharing
On paid plans, share a calendar by link or by inviting people directly, showing either full event details or only your availability.
Works with Proton Mail
Send invitations from a Proton Mail address, manage them without leaving the inbox, and add events received by email, such as flights or meetings, to the calendar.
Recurring events and reminders
Events can repeat daily, weekly, monthly or on a custom pattern, with several reminders or email alerts each. Views switch between day, week and month.
Import and calendar subscriptions
The Easy Switch tool imports existing calendars from other providers, and you can subscribe to calendars that other people keep on a different service.

Proton Calendar pricing

Starts at
$3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly
Free plan
Proton Free: 3 personal calendars with end-to-end encryption and event invitations. No calendar sharing or booking pages, and the desktop app is a 14-day trial.
Free trial
None listed
Proton Free$03 personal calendars, end-to-end encryption, and sending and receiving invitations.
Mail Plus$3.99per month, billed every 12 months ($47.88); $4.99 billed monthly25 personal calendars, calendar sharing and 1 booking page, plus 15 GB of storage and 10 email addresses.
Proton Unlimited$9.99per month, billed every 12 months ($119.88); $12.99 billed monthlyThe same calendar features as Mail Plus, bundled with 500 GB of storage and Proton's VPN, password manager and cloud storage.
Workspace Standard$12.99per user / month, billed every 12 months ($155.88)Business suite with 25 calendars and 25 booking pages per user, 1 TB of storage per user and 15 custom email domains.
Workspace Premium$19.99per user / month, billed every 12 months ($239.88)Everything in Workspace Standard, plus 3 TB of storage per user, 20 custom email domains and data retention policies.
EnterpriseCustomAll Proton services in a customizable package with a dedicated account manager; priced through sales.

Read from proton.me on Oct 5, 2026. Prices change, so confirm with Proton Calendar before you buy.

Pricing in detail

Ways to pay less

  • Annual discount20% off Mail Plus on the 12-month plan

    Proton's pricing page lists Mail Plus at $3.99 a month when billed every 12 months ($47.88), against $4.99 billed monthly. Proton Unlimited is $9.99 instead of $12.99.

    Stated on proton.me
  • EducationStudent discount for the first 12 months

    Students verified through Student Beans get 50% off Mail Plus and 62% off Proton Unlimited for the first 12 months; the plan then renews at the regular price.

    Stated on proton.me
  • NonprofitReduced pricing for registered nonprofits

    Registered nonprofits can request discounted pricing on Proton's business plans from the sales team. No fixed percentage is published.

    Stated on proton.me

How people rate the Proton Calendar app

4.1

out of 5 for the iPhone and iPad app

  1. 5 stars58%
  2. 4 stars14%
  3. 3 stars13%
  4. 2 stars7%
  5. 1 star8%

1,507 ratings on the App Store in the United States, read Oct 5, 2026. It rates the app, not everything the product does. See the listing

Proton Calendar reviews, and where to read more

Works with

  • Proton Mail
  • Proton Meet

Proton Calendar alternatives

All Proton Calendar alternatives comparedAll calendar and scheduling apps

Common questions

Is Proton Calendar free?

Proton Calendar has a free plan. Proton Free: 3 personal calendars with end-to-end encryption and event invitations. No calendar sharing or booking pages, and the desktop app is a 14-day trial. Paid plans start at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.

How much does Proton Calendar cost?

Proton Calendar lists 6 plans. Proton Free: $0. Mail Plus: $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. Proton Unlimited: $9.99 per month, billed every 12 months ($119.88); $12.99 billed monthly. Workspace Standard: $12.99 per user / month, billed every 12 months ($155.88). Workspace Premium: $19.99 per user / month, billed every 12 months ($239.88). Enterprise: custom pricing. Prices were read from proton.me on Oct 5, 2026.

What platforms does Proton Calendar work on?

Proton Calendar is available on Web, macOS, Windows, Linux, iOS and Android.

Does Proton Calendar offer any discounts?

Proton Calendar publicly lists the following: 20% off Mail Plus on the 12-month plan; Student discount for the first 12 months; Reduced pricing for registered nonprofits.

How is Proton Calendar rated?

Proton Calendar's iPhone and iPad app averages 4.1 out of 5 from 1,507 ratings on the App Store in the United States, as read on Oct 5, 2026. That is the store's rating of the app, not a score from us.

Is Proton Calendar open source?

Yes. Proton Calendar is open source, according to its own site.

Is Proton Calendar end-to-end encrypted?

Proton Calendar describes itself as end-to-end encrypted on its own site. Nobody here has audited that.

What does Proton Calendar integrate with?

Proton Calendar's listing names Proton Mail and Proton Meet. A listing names up to eight integrations, so it may connect to more.

Does Proton Calendar have a student discount?

Student discount for the first 12 months. Students verified through Student Beans get 50% off Mail Plus and 62% off Proton Unlimited for the first 12 months; the plan then renews at the regular price.

Who makes Proton Calendar?

Proton Calendar is made by Proton AG.

What are the alternatives to Proton Calendar?

The closest alternatives to Proton Calendar in our directory are Tuta Calendar, Google Calendar, Apple Calendar, Fantastical and Notion Calendar. Each one has a side-by-side comparison with Proton Calendar.

Sources for this page

The prices, plans, platforms and features above were read from these pages on Oct 5, 2026. What people say is linked where it appears.