Best European alternatives to Slack in 2026

Element

Video Conferencing

EU Based

Element is a secure, decentralized messaging and collaboration platform built on the Matrix protocol. It offers end-to-end encrypted chat, voice, and video calls across all major platforms, with self-hosting options and bridges to tools like Slack and Teams.

Fluxer

Video Conferencing

EU Based

Fluxer is an open-source instant messaging and VoIP platform supporting private DMs, group chats, video calls, screen sharing, and file sharing. It offers self-hosting under AGPLv3, custom CSS themes, moderation tools, and multi-device access across desktop and mobile.

Matrix is an open standard protocol for decentralized, encrypted real-time communication supporting instant messaging, VoIP, and IoT. It federates across independently hosted servers with no central control, and bridges multiple chat platforms.

Revolt is an open-source, self-hostable chat platform offering channels, direct messaging, and server communities. It provides a privacy-focused alternative to Discord with no tracking or ads.