Proton Calendar vs Tuta Calendar

Proton Calendar

• 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

Tuta Calendar

• People who want a calendar their provider cannot read
• Tuta Mail users who want email, contacts and calendar in one account
• Linux users looking for an open-source desktop calendar client

Proton Calendar

• 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.

Tuta Calendar

• The Free plan includes one calendar and has no calendar sharing, event invitations or offline support.
• Calendar has no subscription of its own: paid features come with Tuta's paid personal or business mail plans.
• Prices are listed in euros: personal plans include taxes, business plans exclude them, and totals can vary with payment platform fees and exchange rates.
• Other calendars are brought in by import; the calendar page mentions no two-way sync with Google or Outlook calendars.

Proton Calendar

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.

Tuta Calendar

End-to-end encryption

Events, invitations and shared calendars are encrypted end to end with what Tuta calls quantum-safe encryption, so the provider cannot read them.

Encrypted reminders

Event reminders arrive as push notifications on phones and computers. They are sent encrypted and kept hidden from the phone's operating system.

Calendar sharing

On paid plans a calendar can be shared with family or colleagues with read only, read and write, or write and manage sharing rights.

Event invitations

Paid plans can send and receive calendar invitations, and can send one encrypted to someone outside Tuta using a shared password.

Apps on every platform

Apps for Android and iPhone, open-source desktop clients for Windows, macOS and Linux, and a browser version. The Android app is also offered through F-Droid.

Built into Tuta Mail

The calendar shares an account with Tuta's encrypted email and contacts, and existing calendars can be imported in the settings.

Proton Calendar

• Proton Free$0

  3 personal calendars, end-to-end encryption, and sending and receiving invitations.

• Mail Plus$3.99

  per month, billed every 12 months ($47.88); $4.99 billed monthly

  25 personal calendars, calendar sharing and 1 booking page, plus 15 GB of storage and 10 email addresses.

• Proton Unlimited$9.99

  per month, billed every 12 months ($119.88); $12.99 billed monthly

  The same calendar features as Mail Plus, bundled with 500 GB of storage and Proton's VPN, password manager and cloud storage.

• Workspace Standard$12.99

  per 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$19.99

  per 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.

• EnterpriseCustom

  All Proton services in a customizable package with a dedicated account manager; priced through sales.

Tuta Calendar

• Free€0

  One encrypted calendar, 1 GB of storage and apps on every platform. No calendar sharing or event invitations.

• Revolutionary€3

  per month, paid yearly (€3.60 paid monthly), incl. taxes

  Tuta's personal mail and calendar plan: unlimited calendars, calendar sharing, event invitations, offline support and 20 GB of storage.

• Legend€8

  per month, paid yearly (€9.60 paid monthly), incl. taxes

  The same calendar features with 500 GB of storage, 30 extra email addresses, 10 custom domains and priority email support.

• Essential€6

  per user / month, paid yearly (€7.20 paid monthly), excl. taxes

  Business plan with unlimited calendars, sharing and event invitations, shared mailboxes and 50 GB of storage per user.

• Advanced€8

  per user / month, paid yearly (€9.60 paid monthly), excl. taxes

  Business plan with the same calendar features, 500 GB of storage per user, 10 custom domains and priority email support.

• Unlimited€12

  per user / month, paid yearly (€14.40 paid monthly), excl. taxes

  Business plan with 1,000 GB of storage per user, unlimited custom domains and custom branding.

Proton Calendar

• Annual discount

  20% 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.

• Education

  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.

• Nonprofit

  Reduced pricing for registered nonprofits

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

Tuta Calendar

• Annual discount

  Pay yearly and save two months

  Tuta's pricing page shows a yearly payment saving €7.20 on the lowest paid plan (€36 instead of €43.20) and €19.20 on Legend (€96 instead of €115.20).

• Nonprofit

  50% off for nonprofits and schools

  Registered nonprofits and schools for general education can apply to Tuta's sales team for a 50% discount on a subscription.

• Other savings

  Free for qualifying open source projects

  Open source teams can apply by email for a free version of Tuta. Tuta's blog sets out which projects qualify.