EU sovereignOffice & ProductivityHeadquarters: DE

Open-Xchange: sovereignty score and 8 European alternatives

Open-Xchange (OX) develops software for email, calendar, contacts and productivity, mainly for telecom operators, hosting providers, internet service providers, government, education and regulated institutions. Its main product, OX App Suite, is a browser-based collaboration suite. OX also supplies Dovecot Pro, the commercial edition of the Dovecot IMAP server, and PowerDNS, authoritative DNS software. Its website shows customers such as Ionos, Hostpoint, Rackspace, KPN and Swisscom. The software is typically run by providers or organisations themselves; OX emphasises customer control over data, deployment and branding.

Open-Xchange AG was founded in Olpe, Germany, in 2005 and develops at several German locations, with offices in other countries. A Community Edition is available under the AGPL v3.0, with reduced functionality and without support. Because the customer runs the software, the location of the data depends on the operator; on European infrastructure, data remains under European jurisdiction.

See the 8 European alternatives ↓Assess your stack with Open-Xchange pre-selected

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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 July 2, 2026

Headquarters	DE (EU)Verified by hand
Sovereignty model	Vendor-hosted (EU)Verified by hand
Data hosting	EUVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Hosting signal	CLOUDFLARESPECTRUM - Cloudflare London, LLC, US (US)Technically measured
Category	Office & Productivity
Type	Product
Website	open-xchange.com ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Open-Xchange

The European alternatives to Open-Xchange come from our knowledge base of over 6,800 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

31 European Office & Productivity 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 Open-Xchange

Open-Xchange 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 Open-Xchange scores best on data residency.

Open-Xchange 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 Open-Xchange 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 Open-Xchange?

It depends on your use case. Strong EU alternatives to Open-Xchange include Ashampoo Office, Calligra Suite and Craft Docs. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Open-Xchange?

Yes. Open-source EU alternatives to Open-Xchange include Calligra Suite, CryptPad, EGroupware, Euro-Office, eXo Platform and Framasoft (Framapad/Framacalc). These keep your data fully under your own control and let you self-host if you want to.

Is Open-Xchange GDPR-compliant and where is the data hosted?

Open-Xchange is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes Open-Xchange 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 July 2, 2026.

Sources

This record was checked via the vendor's website and legal notice during the full audit of June and July 2026. Source links have been recorded per record since 20 September 2026.

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 Office & Productivity

Office & Productivity: Office software, word processing, spreadsheets and groupware. 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.

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