European Alternatives to Slack
Slack is one of the most widely used workplace messaging platforms, adopted by hundreds of thousands of companies for team communication, channels, integrations and workflow automation. Owned by Salesforce since 2021, it offers a rich ecosystem of bots and third-party apps. For European organizations that need team messaging with end-to-end encryption, EU data residency and full GDPR compliance, several European platforms provide secure, real-time collaboration with strong data sovereignty.
Best European alternatives to Slack for secure team messaging and workplace collaboration
Element is built on the open Matrix protocol with end-to-end encryption and self-hosting options, adopted by the French and German governments. Wire combines secure messaging with video conferencing, designed for regulated industries. Talkspirit is a French collaborative platform for internal communication, knowledge sharing and team engagement. Threema Work and Olvid offer certified zero-knowledge messaging approved for government use. Nextcloud provides team chat as part of a self-hosted productivity suite. Infomaniak kSuite includes chat alongside email, storage and video conferencing.
Element
Team messaging platform built on the open Matrix protocol with end-to-end encryption and federation.
Nextcloud
German open-source self-hosted file sync, sharing, and collaboration platform used by European governments.
Proton
End-to-end encrypted suite from Switzerland offering email, calendar, cloud storage, documents, password manager, and VPN.
Talkspirit
French collaboration platform combining team chat, video conferencing, and document sharing for organizations.
Wire
End-to-end encrypted messaging and video calling platform for businesses, headquartered in Berlin.
Teamwire
German business messenger for government agencies and enterprises with data hosted exclusively in Germany.
Threema Work
Encrypted business messenger from Switzerland requiring no phone number or email address to register.
Citadel Team
Encrypted team messaging and video conferencing application operated by Thales, hosted in France.
Olvid
French encrypted messenger certified by ANSSI, mandated for French government communications since 2023.
Infomaniak kSuite
Swiss-hosted collaboration suite with email, cloud storage, document editing, team chat, and video conferencing.
stashcat
German encrypted messenger for public-sector agencies and enterprises with 1.3 million active users.
