European Alternatives to Slack
Slack is a workplace messaging platform owned by Salesforce. All messages, files, and channel history are stored on Salesforce's US servers and subject to US CLOUD Act jurisdiction.
2 EU alternatives · avg. privacy score 95 · 1 free
Why switch from Slack?
- –All messages stored on Salesforce's US servers — no end-to-end encryption
- –Salesforce subject to US CLOUD Act: your business conversations accessible
- –Messages not end-to-end encrypted — Slack employees can read them
- –Expensive: free plan has severe message history limits
Is Slack GDPR Compliant?
Is Slack GDPR compliant? Since Salesforce acquired Slack for $27.7 billion in 2021, the platform operates under a US corporate parent directly subject to the US CLOUD Act. Even with Slack's EU data residency option and GDPR-aligned DPA, US authorities can legally compel Salesforce to produce your workplace messages and files without notifying your organisation — a fundamental structural tension with GDPR.
Slack end-to-end encryption: Slack does not offer end-to-end encryption for messages. All content is stored in a format that Salesforce employees can technically access. For organisations discussing proprietary intellectual property, legal strategy, financial data, medical information, or HR matters, this represents both a compliance gap and a security risk. The absence of E2E encryption is one of the strongest arguments for switching.
Slack GDPR measures and their limits: Slack offers a Data Processing Agreement, EU data residency (Enterprise Grid only), and standard contractual clauses. These are necessary steps but legally insufficient following Schrems II. The core problem is structural: FISA Section 702 allows US intelligence agencies to compel Salesforce to produce data on non-US persons, regardless of where it is stored. No contractual clause overrides US surveillance law.
Slack GDPR Germany and the public sector: German data protection authorities have consistently flagged unencrypted US-hosted communication tools as non-compliant for sensitive use cases. The German Federal Office for Information Security (BSI) recommends encrypted European alternatives for sensitive business communications. Several German state governments, public health authorities, and universities have restricted or banned Slack for confidential discussions.
European alternatives provide structural GDPR compliance. Element (UK, based on the open Matrix protocol) offers full end-to-end encryption and is fully self-hostable — giving organisations complete control over their data. Stackfield (Germany) provides an all-in-one encrypted collaboration platform with German data storage. Wire for Business (Switzerland) is certified by the German BSI for secure communications. All operate exclusively under GDPR.
2 European Alternatives
Sorted by privacy score
Element
Decentralized messaging on the Matrix protocol. Used by governments and NATO.
| Tool | Score | Privacy | Pricing | OSS | EU Data | Country | |
|---|---|---|---|---|---|---|---|
#1Element Decentralized messaging on the Matrix protocol. Used by governments and NATO. High Trust | 87 | 95 | Freemium | ✓ | ✓ | 🇬🇧 | |
End-to-end encrypted team collaboration. Chat, tasks, and video calls made in Germany. High Trust | 82 | 94 | Paid | — | ✓ | 🇩🇪 |
Decentralized messaging on the Matrix protocol. Used by governments and NATO.
End-to-end encrypted team collaboration. Chat, tasks, and video calls made in Germany.
Slack vs. European Alternatives — Feature Comparison
| Feature | Slack | Element | Stackfield | Wire |
|---|---|---|---|---|
| EU Servers | Optional | ✓ | ✓ | ✓ |
| E2E Encryption | ✗ | ✓ | ✓ | ✓ |
| Self-Hosting | ✗ | ✓ | ✗ | ✓ |
| Open Source | ✗ | ✓ | ✗ | ✗ |
| GDPR Compliant | ⚠ | ✓ | ✓ | ✓ |
| Free Tier | ⚠ | ✓ | ✗ | ✓ |
✓ = available · ✗ = not available · ⚠ = limited / US data transfer risk
Frequently Asked Questions
Element (UK/Matrix protocol) provides enterprise-grade end-to-end encrypted team messaging. Wire (Switzerland) offers encrypted team communication. Stackfield (Germany) is a fully encrypted team collaboration platform. All can be self-hosted.