EU Sovereignty Score
Non-EU vendorBusiness Email & GroupwareHeadquarters: GB

EteSync: sovereignty score and 8 European alternatives

EteSync is a service for end-to-end encrypted synchronisation of contacts, calendars, tasks and notes. Apps are available for Android, iOS and the web, and a DAV bridge lets existing desktop programs and clients connect. According to its makers, the server cannot read the synchronised data. You can sign up for the hosted service or run the open-source server software yourself.

EteSync is offered by EteSync Ltd, a company based in Coventry in the United Kingdom. According to its imprint page, the hosted service's servers are in Germany (Hetzner) and Austria (EDIS). The server software is released under the GNU AGPL v3, so you can operate your own instance and keep the data on your own infrastructure. The iOS app was co-funded in 2019 through NLnet and the NGI0 PET Fund of the EU's Next Generation Internet programme. No explicit GDPR or data processing agreement was found on the site.

See the 8 European alternatives ↓Assess your stack with EteSync pre-selected
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Sovereignty score
79 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-250
    Headquartered outside the EU (GB)
  • 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-675
    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 16, 2026
Headquarters
GB (OTHER)Verified by hand
EU adequacy decision
Yes — found adequate by the European CommissionVerified by hand
Sovereignty model
Vendor-hosted (non-EU)Verified by hand
Data hosting
EUVerified by hand
Open-source
YesVerified by hand
GDPR-compliant
NoVendor-stated
Category
Business Email & Groupware
Type
Product
Website
etesync.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to EteSync

The European alternatives to EteSync come from our knowledge base of over 9,500 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

41 European Business Email & Groupware 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 EteSync

EteSync is headquartered in GB, outside the EU. Contracts and data therefore also fall under non-European law. The GDPR applies through contractual terms, but in a conflict with local legislation you have less certainty than with a European vendor.

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

EteSync 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 EteSync 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 EteSync?

It depends on your use case. Strong EU alternatives to EteSync include AgentJ, audriga and Axigen. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to EteSync?

Yes. Open-source EU alternatives to EteSync include AgentJ, Benno MailArchiv and CipherMail. These keep your data fully under your own control and let you self-host if you want to.

Is EteSync GDPR-compliant and where is the data hosted?

EteSync is headquartered in GB (OTHER) and hosts data in EU. Its GDPR compliance is limited or unclear. For full EU data residency the EU alternatives on this page usually offer more certainty.

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 16, 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

In the changelog

Earlier changes to this page, as listed in the public changelog.

Digital sovereignty in Business Email & Groupware

Business Email & Groupware: Business email servers, groupware, calendar and contact 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 EteSync — GDPR-compliant & EU-hosted · EU Sovereignty Score