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GDPR Compliance Risk

Mattermost is a US-based service subject to the CLOUD Act. EU organizations using this service risk non-compliance with GDPR data transfer requirements.

Mattermost logo

GDPR-Compliant Alternative to Mattermost

🇺🇸Mattermost · US-based · Subject to CLOUD Act

Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.

Why You Need a GDPR-Compliant Alternative to Mattermost

Since the landmark Schrems II ruling in 2020, transferring personal data to US-based services like Mattermost has become a significant legal risk for EU organizations. The US CLOUD Act gives American authorities the power to access data held by US companies, regardless of where that data is physically stored — even if it's in an EU data center.

While the EU-US Data Privacy Framework (DPF) adopted in 2023 provides a new legal basis for transfers, privacy experts and legal scholars have raised concerns about its long-term viability. The framework could face the same fate as its predecessors (Safe Harbor and Privacy Shield), both of which were struck down by the Court of Justice of the EU.

For organizations that want to eliminate compliance risk entirely, switching to a European-based messaging apps is the most straightforward solution. Below are the best GDPR-compliant alternatives to Mattermost, all headquartered in Europe with data stored in EU data centers.

CLOUD Act Exposure

US authorities can access your data stored by Mattermost, even if servers are located in Europe.

GDPR Fine Risk

Non-compliant data transfers can result in fines up to 4% of annual global revenue under GDPR Article 83.

EU Alternative Available

3 GDPR-compliant European alternatives available with full EU data residency.

3 GDPR-Compliant Alternatives to Mattermost

European services with full GDPR compliance and EU data residency

Element logo

Element

🇬🇧

by Element

Element is a secure messenger and collaboration platform built on the Matrix open protocol, developed by Element (formerly New Vector) in London, UK. It provides end-to-end encrypted messaging, voice/video calls, and bridging to other platforms (Slack, Teams, WhatsApp). Element is used by the French government, German military (Bundeswehr), and NATO for secure communications. Organizations can self-host for complete data sovereignty, or use Element's managed hosting.

Open SourceSelf-HostableISO 27001EU-hostedGDPR Compliant
freemium
View Details
Visit Element
Wire logo

Wire

🇨🇭

by Wire

Wire is a secure collaboration platform founded in 2012 by Janus Friis (Skype co-founder) and headquartered in Zug, Switzerland. It offers end-to-end encrypted messaging, voice/video calls, and file sharing for teams. Wire is open source, independently audited, and used by government agencies and enterprises across Europe for classified communications. It supports self-hosted deployment for organizations requiring full data sovereignty.

EU-BasedGDPR CompliantOpen SourceSelf-HostableSwiss hosted
freemium
View Details
Visit Wire
Threema logo

Threema

🇨🇭

by Threema

Threema is a Swiss encrypted messenger founded in 2012 by Manuel Kasper in Pfäffikon, Switzerland. Unlike most messaging apps, Threema requires no phone number or email to register — users get a random Threema ID, enabling truly anonymous communication. All messages, calls, and files are end-to-end encrypted, and metadata is minimized by design. Threema is fully open source and has been independently audited. It's widely adopted in German-speaking countries and used by the Swiss government and military.

GDPR CompliantEU-BasedISO 27001Open SourceSwiss hosted
paid
View Details
Visit Threema

Quick GDPR Compliance Comparison

ServiceHQ LocationGDPR NativeEU Data CentersCLOUD Act FreePricing
🇺🇸Mattermost
United StatesNoPartialNo-
🇬🇧ElementGBYesYesYesfreemium
🇨🇭WireCHYesYesYesfreemium
🇨🇭ThreemaCHYesYesYespaid

Frequently Asked Questions

Is Mattermost GDPR compliant?

Mattermost is a US-based service operated by Mattermost. While it may have some GDPR compliance measures, as a US company it is subject to the CLOUD Act, which allows US authorities to access data stored by US companies regardless of where the data is physically located. This creates a fundamental conflict with GDPR requirements for data protection.

What are the GDPR risks of using Mattermost?

The main GDPR risks include: (1) Data transfers to the US may lack adequate protection since the Schrems II ruling invalidated Privacy Shield, (2) US authorities can demand access under the CLOUD Act, (3) Your organization may face GDPR fines up to 4% of annual revenue for non-compliant data transfers, and (4) User consent may not be sufficient to legitimize transfers given the systematic access by US authorities.

What are the best GDPR-compliant alternatives to Mattermost?

The top GDPR-compliant alternatives to Mattermost include Element, Wire, Threema. These European services store your data in EU data centers and are fully subject to GDPR protections.

How do I migrate from Mattermost to a GDPR-compliant alternative?

Most migrations involve three steps: (1) Export your data from Mattermost using their data export tools, (2) Create an account with your chosen EU alternative, and (3) Import your data into the new service. We provide detailed migration guides for each alternative to make the switch as smooth as possible.

Can EU companies legally use Mattermost?

Since the Schrems II ruling (2020), EU organizations face significant legal risk when using US cloud services like Mattermost. While the EU-US Data Privacy Framework (2023) provides a new legal basis, its long-term stability is uncertain. Many EU data protection authorities recommend using EU-based alternatives to avoid compliance risks entirely.

Other GDPR Alternatives in Messaging Apps

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Related Pages

Migration Resources

Last updated: January 24, 2026