EU Sovereignty Score
Self-hosted / open sourceMessagingHeadquarters: GB

MongooseIM: sovereignty score and 8 European alternatives

MongooseIM is an open-source XMPP server written in Erlang, designed for large instant messaging deployments. Besides standard XMPP clients, it accepts connections over a REST API, server-sent events, WebSocket and BOSH; extension modules cover message archives, group chat, push notifications and presence. The software is distributed as packages, Docker images and Helm charts, so organisations run it on their own infrastructure or in their own cloud.

MongooseIM is developed and maintained by Erlang Solutions Ltd, which is registered with its office in London, England, and is part of the Trifork Group. The software is licensed under the GNU General Public License version 2 with an OpenSSL exception, so an organisation can inspect, modify and run it itself. Data stays on the infrastructure chosen by the operator. The English registered office is outside the EU, but for self-hosted software this matters less than for a service the provider hosts itself.

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Sovereignty score
77 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-250
    Headquartered outside the EU (GB)
  • Data residency SOV-3100
    No hosting in Europe (OTHER)
  • 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-665
    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 12, 2026
Headquarters
GB (OTHER)Verified by hand
EU adequacy decision
Yes — found adequate by the European CommissionVerified by hand
Sovereignty model
Open-source, distributedVerified by hand
Data hosting
OTHERVerified by hand
Open-source
YesVerified by hand
GDPR-compliant
NoVendor-stated
Category
Messaging
Type
Product
Website
trymongoose.im ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to MongooseIM

The European alternatives to MongooseIM 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

29 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 MongooseIM

MongooseIM 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.

MongooseIM hosts data outside the EU (OTHER). Personal data therefore leaves the EU, which requires a transfer mechanism under the GDPR and pulls the data residency score down.

MongooseIM 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 MongooseIM 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 MongooseIM?

It depends on your use case. Strong EU alternatives to MongooseIM include 360dialog, Balsio and Berty. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to MongooseIM?

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

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

MongooseIM is headquartered in GB (OTHER) and hosts data in OTHER. 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 12, 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 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.

Also in this category

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