What is a European calendar app?

A European calendar app is a calendar service or application developed by a company or organization based in Europe. Depending on the provider, it may offer stronger privacy protections, European data hosting, open-source software, or encryption that limits access to your events.

Are European calendar apps more private than Google Calendar?

Often, but it depends on the provider. Some European calendars use end-to-end encryption so the provider cannot read sensitive event information. Others primarily improve privacy through reduced tracking, European hosting, self-hosting, or a business model that doesn’t rely on advertising.

Is Proton Calendar end-to-end encrypted?

Mostly. Events you create, and invitations exchanged between Proton Calendar users, are encrypted end-to-end, so your device encrypts the data before it reaches Proton's servers, and Proton never sees it unencrypted. Invitations from non-Proton calendar apps arrive unencrypted and are encrypted by Proton's servers on arrival instead, a related method called zero-access encryption, where Proton still can't read the content afterward but didn't receive it already encrypted. Scheduling metadata such as event start/end times and recurrence rules isn't encrypted either way, since Proton's servers use it to sync your calendar and deliver reminders. Check out the Proton Calendar security model [/blog/protoncalendar-security-model] for more details.

Can I move my Google Calendar to a European calendar?

Yes. Calendar data can generally be exported using the standard ICS format and imported into another service. Proton also offers Easy Switch [/easyswitch] to help move calendars and other data from Google.

Can European calendars sync with my phone?

Yes. Many European calendar services offer mobile apps or support standards such as CalDAV that let you synchronize events across compatible phones, tablets, and computers.

European alternatives > Calendar apps

European calendar apps

Your calendar can reveal a detailed picture of your life, including where you go, who you meet, and how you spend your time. Most people use calendars from Google, Microsoft, or Apple, adding another layer of personal information to the same Big Tech ecosystem they already use for email, cloud storage, search, and more.

European calendar apps give you alternatives with stronger privacy protections, less tracking, and more control over your personal data. Choosing European alternatives also reduces your dependence on Big Tech and supports a more diverse tech ecosystem.

Proton Calendar

Based: Geneva, Switzerland

A private calendar that protects your schedule with strong encryption

Protects event titles, descriptions, locations, and attendee information with end-to-end and zero-access encryption
No ads or tracking
Lets you share calendars while controlling how much information other people can see
Private appointment scheduling
Open source and independently audited
Aligns with GDPR
Part of a privacy-first ecosystem

Create a free account

Tuta Calendar

Based: Hanover, Germany

A zero-knowledge encrypted calendar for personal and business scheduling

End-to-end encrypts calendar events
Encrypted notifications keep event times private
Supports shared calendars and event invitations
No advertising or behavioral profiling
Open source
Aligns with GDPR

Proton privacy score: ⭐⭐⭐⭐⭐

mailbox.org Calendar

Based: Berlin, Germany

A secure calendar included with mailbox.org's email and cloud tools

Encrypts calendar data while it’s being sent
Shared calendars help families and teams coordinate schedules
Supports CalDAV for syncing with compatible calendar apps
No advertising, tracking, or data monetization
Aligns with GDPR
Partially open source
No end-to-end or zero-access encryption

Proton privacy score: ⭐⭐⭐⭐☆

Nextcloud Calendar

Based: Stuttgart / Berlin, Germany

An open-source calendar you can host yourself to keep control of your data

Self-hosting lets you choose where your calendar data is stored
Supports CalDAV for syncing across compatible devices and apps
Share calendars with individuals, groups, or users on other Nextcloud servers
Integrates with the wider Nextcloud productivity platform
Open source
Aligns with GDPR when self-hosted within the EU
No end-to-end or zero-access encryption

Proton privacy score: ⭐⭐⭐⭐☆

Infomaniak Calendar

Based: Geneva, Switzerland

A Swiss-hosted calendar included with Infomaniak’s email and cloud tools

Syncs calendars and tasks across compatible devices
Share calendars with controlled access permissions
Supports open calendar formats for importing, exporting, and syncing
No advertising or sale of personal data
Not open source
No end-to-end or zero-access encryption
Aligns with GDPR

Proton privacy score: ⭐⭐⭐⭐☆

Morgen*

Based: Zurich, Switzerland

A calendar and task manager that brings existing calendars together in one app

Calendar events are not permanently stored on Morgen's servers
Encrypts information transmitted to and stored by its services
Does not show ads or sell personal information
Supports scheduling, time blocking, tasks, and CalDAV calendars
Aligns with GDPR
Partially open source (the core app is closed)
No end-to-end or zero-access encryption

Proton privacy score: ⭐⭐⭐☆☆

*Morgen is a calendar client, so your calendar data lives with whatever account you connect it to.

Why choose a European calendar app?

Keep more of your schedule private

Calendars can contain sensitive information, from medical appointments and travel plans to business meetings and personal relationships.

Privacy-focused European calendars can reduce how much of this information the provider itself can see, particularly when they use end-to-end or zero-knowledge encryption, such as Proton or Tuta.

Less tracking and profiling

Free calendars from Google or Microsoft are part of a much larger ecosystem that collects and processes sensitive data for targeted ads, tracking, behavioral profiling, AI model training, and sharing or selling to other companies with different data processing rules.

They may seem free, but they actually cost your privacy. Independent European providers such as Proton do offer free plans, but these are fully supported by paid subscribers, not your data.

Stronger data protection laws

US-based calendar providers can be legally compelled to hand over user data to US authorities under laws such as the CLOUD Act, FISA Section 702, and standard court warrants, regardless of where that data is physically stored.

European calendar providers operate under strong privacy and data protection laws. EU companies must align with the GDPR, while providers based outside of the EU, such as Switzerland, operate under their own national privacy frameworks, such as the revised Swiss Federal Act on Data Protection (nFADP).

Support a more competitive tech sector

Beyond who controls your own data, choosing a European calendar app is also a vote for European tech sovereignty: a more competitive digital market where a handful of Big Tech platforms don’t get to set the terms for how sensitive data is handled across the internet.

A stronger European tech sector means more homegrown alternatives, less dependence on the same small group of global companies, and greater European control over the digital infrastructure people rely on every day.

Which European calendar app is best for you?

Different calendar apps do different things well. The right choice depends on whether you prioritize encryption, self-hosting, collaboration, or integration with your existing tools.

Maximum privacy: Proton Calendar and Tuta Calendar use end-to-end and zero-access encryption to keep sensitive event information private from the provider.
Self-hosting: Nextcloud Calendar gives you control over where your calendar data is stored and who manages the server.
Email and other tools: Proton Calendar, mailbox.org Calendar, and Infomaniak Calendar are part of broader services that also include email and other everyday tools.
Existing calendars: Morgen brings calendars from several providers together without becoming the primary host for your event data.
Open source: Proton Calendar, Tuta Calendar, and Nextcloud Calendar make source code available for inspection.

Tips for switching to a European calendar app

Changing calendar providers is usually easier than changing your email address. A few steps can help you move without missing appointments or invitations.

Import your existing events

Most calendar services let you export your existing schedule as an ICS file and import it into another calendar. Some providers also offer dedicated migration tools, such as Proton’s Easy Switch.

Keep your old calendar temporarily

Leave your existing calendar active while you switch. This gives you time to check that recurring events, invitations, and reminders have transferred correctly.

Update shared calendars

If you share calendars with family members, coworkers, or other groups, recreate the sharing permissions and make sure everyone has access before removing the old calendar.

Check what is encrypted

Not every private calendar uses end-to-end encryption. Check which information the provider can access, especially event names, descriptions, locations, attendees, and times.

Review connected apps

Calendar integrations may give third-party apps access to your events and contacts. Remove connections you no longer use and limit permissions where possible.

Run a few tests

Testing notifications, time zones, recurring events, and responses first can help you catch any problems before they affect important plans.

Not European, but still not Big Tech calendar apps

If you want to move away from Google Calendar, Microsoft Outlook, or Apple Calendar but don't specifically need a European provider, there are other alternatives worth considering. Their privacy protections and jurisdictions vary.

Fantastical*

Based: New York, United States

A feature-rich calendar app that connects to your existing calendar provider

Supports services including iCloud, Google, Microsoft, and CalDAV
End-to-end encrypts synced calendar sets and templates
Collects analytics, but this can be disabled
Includes scheduling, tasks, time zones, and calendar management tools
Not open source

Proton privacy score: ⭐⭐⭐⭐☆

Thunderbird Calendar*

Based: California, United States

An open-source calendar built into the Thunderbird desktop app

Calendar events can be stored locally on your device
Supports standards including CalDAV and iCalendar
Calendar event content stored locally is not sent to Thunderbird
No ads
Open source
No end-to-end or zero-access encryption

Proton privacy score: ⭐⭐⭐☆☆

Fastmail Calendar

Based: Melbourne, Australia

A calendar built into the Fastmail email service

Shared calendars for families and teams
Syncs calendars across devices
No advertising-based business model
Partially open source (the client app is closed)
No end-to-end or zero-access encryption
Subject to Australia's Assistance and Access Act (2018), which can compel companies to provide technical assistance to law enforcement

Proton privacy score: ⭐⭐⭐☆☆

*Fantastical and Thunderbird Calendar are calendar clients, so your calendar data lives with whatever account you connect them to.

Frequently asked questions about European calendar apps

What is a European calendar app?: A European calendar app is a calendar service or application developed by a company or organization based in Europe. Depending on the provider, it may offer stronger privacy protections, European data hosting, open-source software, or encryption that limits access to your events.
Are European calendar apps more private than Google Calendar?: Often, but it depends on the provider. Some European calendars use end-to-end encryption so the provider cannot read sensitive event information. Others primarily improve privacy through reduced tracking, European hosting, self-hosting, or a business model that doesn’t rely on advertising.
Is Proton Calendar end-to-end encrypted?: Mostly. Events you create, and invitations exchanged between Proton Calendar users, are encrypted end-to-end, so your device encrypts the data before it reaches Proton's servers, and Proton never sees it unencrypted.
Invitations from non-Proton calendar apps arrive unencrypted and are encrypted by Proton's servers on arrival instead, a related method called zero-access encryption, where Proton still can't read the content afterward but didn't receive it already encrypted.
Scheduling metadata such as event start/end times and recurrence rules isn't encrypted either way, since Proton's servers use it to sync your calendar and deliver reminders.
Check out the Proton Calendar security model for more details.
Can I move my Google Calendar to a European calendar?: Yes. Calendar data can generally be exported using the standard ICS format and imported into another service. Proton also offers Easy Switch to help move calendars and other data from Google.
Can European calendars sync with my phone?: Yes. Many European calendar services offer mobile apps or support standards such as CalDAV that let you synchronize events across compatible phones, tablets, and computers.

Explore more European alternatives

Looking beyond calendars? Find European alternatives for email, browsers, cloud storage, maps, search engines, social media, messaging, and more.

Browse European alternatives