Self-Hosted Slack & Team Chat Alternatives (2026)
Ranked by how painless they are to run yourself — from one-click deploys and single docker run commands up to multi-service stacks. Lower difficulty first.
Modern, self-hosted web IRC client for always-on team chat
Fully customizable open-source communications platform and Slack alternative
Open-source, self-hostable Slack alternative for secure team messaging and collaboration
Open-source team chat with a unique topic-based threading model
Open-source instant messaging server with a Go backend and multi-platform clients
Self-hosted chat, video calls, and conferencing integrated into Nextcloud
Self-hostable open-source video conferencing alternative to Teams meetings
Matrix-based secure messenger and Slack alternative with end-to-end encryption
Reference Matrix homeserver powering decentralized, federated team chat
Open-source, Discord-compatible chat backend you can self-host