European Alternatives to Slack
Slack is one of the most widely used team chat services in the world. It provides a free plan where the number of messages that can be seen in the chat history is limited. This pages lists European Slack alternatives from companies based in a member state of the European Union (EU) or the European Free Trade Association (EFTA).
Stackfield
Stackfield is a German all-in-one project management and team communication platform with end-to-end encryption, trusted by over 10,000 companies for handling sensitive data.
Infomaniak kChat
Infomaniak kChat is the Swiss team chat – Slack alternative, Swiss servers, integrated with Infomaniak suite.
Infomaniak
Infomaniak is a Swiss independent sovereign cloud provider – 100% renewable energy, servers used 10 years, 200% CO2 compensation, and no greenwashing.
Nextcloud Talk
Nextcloud Talk is the open-source video conferencing – part of Nextcloud, self-hosted, private communication.
Fleep
Fleep is the Estonian team messenger – business chat, email integration, Estonian company.
Stackhero Mattermost
Stackhero Mattermost is managed Mattermost hosting – French company, EU servers.
Wire
Wire is a Swiss end-to-end encrypted team communication service offering secure messaging, voice calls, and video conferencing with open-source apps.
Nozbe
Nozbe is the Polish productivity app – GTD-inspired task management, team collaboration, works across all devices.
ginlo Business
ginlo Business is the German encrypted messenger for enterprises – end-to-end encrypted, GDPR compliant.
ginlo Private
ginlo Private is the German private messenger – end-to-end encrypted, free, German servers.
Private Discuss
Private Discuss is a private discussion platform – encrypted conversations.
Element
Element is a UK Matrix-based E2E encrypted messenger and collaboration platform – the Microsoft Teams alternative with air-gapped, federated, and sovereign deployment.
Mattermost
Mattermost is a mission-critical collaboration platform for security-focused organizations, used by USAF for 4x mission information availability improvement, with GDPR Schrems II compliance.
Rocket.Chat
Rocket.Chat is a secure CommsOS for mission-critical operations with zero-trust security, DoD ATO up to IL6, and deployment on NIPRNet, SIPRNet, and JWICS networks.