Self-hosted / open sourceMessagingHeadquarters: DE

Delta Chat: sovereignty score and 8 European alternatives

Delta Chat is a free, open-source messenger for mobile and desktop that uses email-style relays instead of a central service. Apps exist for Android, iOS, desktop and Ubuntu Touch. Contacts are added by QR code or invite link, with no public discovery and no phone number needed. Messages are end-to-end encrypted by default, using a secure subset of OpenPGP with the Autocrypt and Secure-Join protocols. Profiles, groups and contacts exist only on the user's devices.

Delta Chat relies on chatmail relays, email-style servers that only forward messages and hold them temporarily while a recipient is offline. These relays are run by various groups, not by the Delta Chat developers, and users can add or remove them, so the hosting location depends on the relay chosen. The German company merlinux GmbH in Freiburg lists Delta Chat among its key project involvements. According to the project, forward secrecy and post-quantum cryptography are not yet supported.

See the 8 European alternatives ↓Assess your stack with Delta Chat 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 October 2, 2026

Headquarters	DE (EU)Verified by hand
Sovereignty model	Open-source, distributedVerified by hand
Data hosting	EUVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Compliance documents	1 published, see belowVendor-stated
Hosting signal	HETZNER-AS - Hetzner Online GmbH, DE (DE)Technically measured
Category	Messaging
Type	Product
Website	delta.chat ↗

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 Delta Chat

The European alternatives to Delta Chat 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

21 European Messaging 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 Delta Chat

Delta Chat 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 Delta Chat scores best on data residency.

Delta Chat 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 Delta Chat 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 Delta Chat?

It depends on your use case. Strong EU alternatives to Delta Chat include Balsio, Berty and Conversations (XMPP). On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Delta Chat?

Yes. Open-source EU alternatives to Delta Chat include Berty, Conversations (XMPP), Dino and Gajim. These keep your data fully under your own control and let you self-host if you want to.

Is Delta Chat GDPR-compliant and where is the data hosted?

Delta Chat is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes Delta Chat 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 2, 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".

Security page / trust center: delta.chat/en/privacy

Provenance of the links above:Vendor-stated

Links checked on September 23, 2026.

Digital sovereignty in Messaging

Messaging: Personal messaging — chat, group conversations, media sharing. 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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