Of all Google's consumer apps, Calendar is the one people underestimate. It holds not just appointments but the shape of your life: medical visits, travel plans, recurring reminders going back years. Leaving it is less about finding a replacement grid and more about making sure that history and access survive the move.
This post is part of a series on moving off American software.
The good news: there are European calendar services that take this seriously, and the open standards behind calendars make switching more feasible than it looks. The caveat: not every provider treats openness the same way, and the most private options are also the most closed.
The options
Proton Calendar is a Swiss service with a strong focus on privacy. It uses zero-knowledge encryption, which means Proton cannot read the content of your calendar even though events are stored on its servers. If your threat model includes the provider itself, this is the headline feature.
Tuta Calendar is an end-to-end encrypted calendar service from Germany, available as apps for iOS and Android or through a web app. As with Tuta's mail, end-to-end encryption means the data is decrypted only on your device — the provider cannot read it, and in exchange you use Tuta's own clients. The same trade as their email, applied to your schedule.
Calendar.online is a German service with a clever approach to sharing. You can create different access links with different permissions for the same calendar — for example, a link with 'read without details' permission lets someone you want to meet see when you are busy without knowing why, and reach out accordingly. You can also create sub-calendars to manage different kinds of dates. A free plan exists, and it is hosted in the EU.
fruux is a German calendar service whose CalDAV server is open source. If your priority is standards and the ability to inspect or self-host the plumbing rather than encrypted bells and whistles, this is the pragmatic pick.
The lock-in problem
Calendars lock you in through convenience more than through data formats. Google assumes your calendar lives inside its apps, and once your phone, email and video calls all route through Google, the calendar follows. The European services here break that pattern in different ways:
- Standards-based options like fruux speak CalDAV, an open protocol, so any compatible calendar app on any device can read and write your events.
- Encrypted options like Proton Calendar and Tuta Calendar invert the deal: much stronger privacy, but you use their apps.
Neither is wrong. Strong encryption is a real protection — a calendar is a detailed record of where you are and when. But choose it knowing you are joining an ecosystem, not renting a slot.
Export before you commit
Syncing entries between devices is a solved problem across this list; most calendar services offer an iCalendar interface, an open standard for exchanging calendar content. That openness is your insurance policy. Before moving, export your existing calendar data in a standard format rather than trusting a one-click migration — and before adopting any new service, check what it offers for getting your data back out. A calendar that cannot export is a calendar you can never leave, however friendly the onboarding looks.
Shared calendars deserve the same scrutiny. If you coordinate with a partner or a team inside Google today, check that the replacement supports shared calendars where other people can see and create events — that is the everyday feature that quietly decides whether a switch sticks.
No comments yet