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Independently verified · Quarterly re-audit
EU VETTED
Head-to-head

Slack vs Element (Matrix)

How Element (Matrix), a European Video conferencing tool, compares with Slack on the signals a privacy-conscious buyer actually checks: who owns it, where it hosts, and its exposure to the US CLOUD Act.

In short

Element (built on the open Matrix protocol, UK-based, end-to-end encrypted, CLOUD Act exposure: Material on managed Element Cloud, but none when self-hosted) is the sovereignty-focused alternative to Slack, and the one European governments actually deploy. The German Bundeswehr's BwMessenger and France's Tchap both run on Matrix. Slack is owned by Salesforce, a US-incorporated company, with direct CLOUD Act exposure. Element's decisive advantage is the self-hosted path: run it on EU infrastructure you control and there is no US host and no US parent, with end-to-end encryption on by default.

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Side-by-side

Slack vs Element (Matrix), on the sovereignty signals

Compliance and pricing facts, side by side. The right column is pulled live from our verified dataset; the left reflects the incumbent’s public profile.

Slack vs Element (Matrix), on the sovereignty signals
Signal Slack Element (Matrix)
Ownership US-owned Other
Hosting region US United Kingdom
CLOUD Act exposure Direct Material
Sovereignty US-LINKED EU-HOSTED self-host EU-Based
Certifications None listed
ISO 27001
Price from Free / from $7.25/user/mo Paid
Visit Element (Matrix) → Read the Element (Matrix) profile →
Verdict

Slack vs Element (Matrix): which should you pick?

For organisations that will not settle for anything short of sovereign, confidential messaging, Element is the strongest answer to Slack, and uniquely, it is the one European governments actually run, via Bundeswehr's BwMessenger and France's Tchap. Slack is owned by Salesforce (NYSE: CRM), US-incorporated, with direct CLOUD Act exposure that EU data residency alone does not remove.

The decision hinges on how you run Element. Self-hosted on EU infrastructure (a Matrix homeserver you control), exposure is Material (none), with end-to-end encryption by default. Managed Element Cloud is easier but runs primarily on AWS, so its exposure is material, even though message content stays E2E-encrypted.

Pick Slack if a large app marketplace and maximum UI polish are decisive. Pick self-hosted Element for a fully sovereign, end-to-end-encrypted messaging stack (the configuration governments standardise on), or Element Cloud if you want Matrix and E2E without running the server, accepting the AWS dependency.

Switching

Migrating from Slack to Element (Matrix)

Slack-to-Element is a structured migration: plan the homeserver first, then move people and channels before history.

  1. Stand up your homeserver. Decide between self-hosted (a Synapse or Element Server Suite homeserver on EU infrastructure, the sovereign path) and managed Element Cloud. This choice sets your exposure profile before anything moves.
  2. Map channels to rooms and spaces. Recreate your active Slack channel structure as Matrix rooms grouped into spaces. Migrate the channels people use daily first; leave dormant ones behind.
  3. Import history where it matters. Use a Slack import tool to bring across the history you need, accepting that threads and formatting may require cleanup. Keep Slack read-only as the authoritative archive during the transition.
  4. Rebuild integrations and cut over. Recreate essential bots and integrations natively, onboard the team, then retire Slack once active conversation has fully moved to Element.
FAQ

Slack vs Element (Matrix): frequently asked questions

Why do European governments use Element/Matrix instead of Slack?
Because the self-hosted, end-to-end-encrypted model fits sovereignty requirements that hosted US messaging cannot meet. Element is built on the open Matrix protocol, is open source, and can be self-hosted on EU infrastructure, which is why the German Bundeswehr (BwMessenger) and the French government (Tchap) run on it. Self-hosted on infrastructure you control, CLOUD Act exposure is Material (none), with E2E encryption by default. Slack, owned by Salesforce, is US-incorporated with direct exposure.
Does Slack fall under the US CLOUD Act?
Yes. Slack is owned by Salesforce, Inc., a US-incorporated public company (NYSE: CRM), so it is directly within the reach of the US CLOUD Act regardless of data location. Slack offers an SCC-based DPA and EU data residency on Enterprise plans, so it is legally usable from the EU; the alternative search is about removing the US-jurisdiction exposure that a Schrems II assessment must document, which EU data residency alone does not do.
What's the difference between Element Cloud and self-hosted Element?
Element Cloud is the managed, vendor-hosted service; its primary hosting runs on AWS and it uses some US sub-processors, so its CLOUD Act exposure is Material (material), even though message content stays end-to-end encrypted. Self-hosted Element (a Synapse or Element Server Suite homeserver on EU infrastructure) removes that exposure entirely. The sovereignty case for Element rests on the self-hosted path; the managed cloud trades some of that away for convenience.
Is Element's UK ownership a concern for EU buyers?
Element is UK-based, and the UK is outside the EU but holds an EU adequacy decision, so transfers are legally recognised. More importantly, with self-hosting the ownership question is largely moot. Your homeserver runs on infrastructure you control, and the vendor has no access to your message content, which is end-to-end encrypted. The classification we record reflects the managed-cloud profile; a self-hosted deployment is governed by your own hosting choices.
Can I migrate Slack history and channels to Element?
Channels and workspaces map to Matrix rooms and spaces, and import tools exist to bring Slack history across, though fidelity varies. Threads, integrations, and some formatting may need cleanup. Most organisations migrate the active channel structure and people first, archive Slack read-only for history, and rebuild integrations natively. Plan the homeserver and identity setup before the cutover.
Does Element match Slack on features?
For core team messaging (channels, threads, voice and video calls, file sharing, and bridging to other networks), yes, and it adds federation and end-to-end encryption that Slack lacks. Where Slack still leads is its app marketplace and polish: the integration ecosystem is larger and the UX more refined. If your team relies on a long tail of Slack apps, audit those first; if your priority is encrypted, sovereign messaging, Element is built for it.
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METHODOLOGY

How we verified each row above.

For every product we read the public DPA, sub-processors document, hosting region declaration, and corporate ownership records. Each is timestamped. Signals are editorial, re-verified quarterly. We never accept self-attestation.

Reviewed by the EU Vetted editorial team · Editorial guidelines

Last verified June 2026

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