EU Sovereignty Score
Self-hosted / open sourceScheduling & BookingHeadquarters: DE

Nextcloud Calendar: sovereignty score and 8 European alternatives

Nextcloud Calendar is the calendar and scheduling app of the Nextcloud collaboration platform. Users create and edit events online, share calendars and synchronise appointments with phones, computers and other devices using the CalDAV standard. The app is installed as an extension on a Nextcloud server and distributed through the Nextcloud App Store. It is aimed at organisations that want their calendar data kept on their own infrastructure.

Nextcloud GmbH, the company behind the platform, is based in Germany and is therefore an EU company; the sources consulted name no foreign parent. The calendar app is open source under the AGPL-3.0 licence, and its code is publicly available on GitHub. Because the app runs on the organisation's own Nextcloud server, data stays where that server is operated. Organisations that do not want to run a server can use Nextcloud One, a managed service hosted in Germany by a partner. For a European organisation, the combination of an EU headquarters, open-source code and self-hosting is the main sovereignty advantage. The operator remains responsible for the server, backups and access control.

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Sovereignty score
94 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-6100
    Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 10, 2026
Headquarters
DE (EU)Verified by hand
Data hosting
Self-hosted, e.g. in EU (your choice)Verified by hand
Open-source
YesVerified by hand
GDPR-compliant
YesVendor-stated
Category
Scheduling & Booking
Type
Product
Website
apps.nextcloud.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Nextcloud Calendar

The European alternatives to Nextcloud Calendar come from our knowledge base of over 7,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

57 European Scheduling & Booking vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with Nextcloud Calendar

Nextcloud Calendar is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so Nextcloud Calendar scores best on data residency.

Nextcloud Calendar is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Nextcloud Calendar together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to Nextcloud Calendar?

It depends on your use case. Strong EU alternatives to Nextcloud Calendar include Agendize, aleno and Baïkal. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Nextcloud Calendar?

Yes. Open-source EU alternatives to Nextcloud Calendar include Baïkal. These keep your data fully under your own control and let you self-host if you want to.

Is Nextcloud Calendar GDPR-compliant and where is the data hosted?

Nextcloud Calendar is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes Nextcloud Calendar an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 10, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in Scheduling & Booking

Scheduling & Booking: Appointment scheduling, online booking systems and calendar management. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

Also in this category

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8 European alternatives to Nextcloud Calendar — GDPR-compliant & EU-hosted · EU Sovereignty Score