Chatto

Self-hosted team and community chat with built-in voice and video calls

Alternative to: slack, discord, microsoft teams

Chatto is a self-hosted chat application for teams and communities that bundles messaging, voice and video calls, and single sign-on into one deployable package. It ships official container images and runs without heavy external dependencies for straightforward self-hosting. The project is privacy-first and GDPR-focused, aimed at teams who want a fast Slack- or Discord-style chat they fully control.