SovEU · Atlas · European alternatives · chat
European alternatives to Slack
European companies mapped as alternatives to Slack. Each carries an evidence-led sovereignty profile — jurisdiction, hosting, US exposure, DPA and more — reviewed by SovEU. Profiles are descriptive, not a compliance verdict.
6 alternatives
Secure messaging and collaboration client built on the open Matrix protocol, developed by Element (New Vector Ltd) in the UK; self-hostable.
Open-source, self-hostable messaging and collaboration platform. The company is US-based; the software is widely self-hosted within Europe.
Open-source team communication platform; the company is registered in Germany and the software is self-hostable.
End-to-end encrypted collaboration and messaging platform operated by Wire Swiss GmbH / Wire GmbH, with European hosting; clients are open source.
Encrypted team collaboration and project management tool operated by Stackfield GmbH in Munich, Germany, with German hosting.
End-to-end encrypted messenger operated by Threema GmbH in Switzerland, with Swiss hosting; the apps are open source.
Compare side by side
The same evidence-led signals across each alternative. A blank cell (“—”) means the signal isn't recorded — never a negative claim — and the score is a transparent signal score, not a compliance verdict.
| Signal | Element (Matrix)GB | MattermostUS | Rocket.ChatDE | WireDE | StackfieldDE | ThreemaCH |
|---|---|---|---|---|---|---|
| Sovereignty score | 72/ 100Strong sovereignty signals | 60/ 100Moderate sovereignty signals | 78/ 100Strong sovereignty signals | 78/ 100Strong sovereignty signals | 58/ 100Moderate sovereignty signals | 72/ 100Strong sovereignty signals |
| HQ jurisdiction | United Kingdom | United States | — | — | Germany | Switzerland |
| Primary hosting region | — | — | — | — | Germany | Switzerland |
| EU data residency option | — | — | — | — | — | — |
| US cloud dependency | — | — | — | — | — | — |
| Data Processing Agreement | — | — | — | — | — | — |
| Subprocessor list published | — | — | — | — | — | — |
| Self-hosting option | Yes | Yes | Yes | — | — | — |
| Open source | Yes | Yes | Yes | Partial | — | Partial |