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Chatto
Open SourceSelf-hostableSelf-hostable team & community chat.
4.6896 starsAlternative to Slack, Microsoft Teams, Discord
Overview
Chatto is a free, open-source tool and a self-hostable alternative to Slack, Microsoft Teams, Discord. It's licensed under AGPL 3.0 and written in Go.
Chatto is a self-hostable chat platform for teams and communities with real-time messaging plus built-in voice calls, video calls, and screen sharing. It's privacy-first and GDPR-compliant, so conversations and data stay on your own infrastructure — a free, open alternative to Slack, Microsoft Teams, and Discord.
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Why pick Chatto over Slack
- Own your data instead of trusting Slack's servers
- No per-seat pricing — grow without ballooning costs
- Chatto is open source: audit it, fork it, extend it
- Self-host for full privacy and compliance control
Key features
- Real-time messaging with channels for teams and communities
- Built-in voice and video calls (powered by LiveKit)
- Screen sharing during calls
- Privacy-first and GDPR-compliant — data stays on your own servers
- Self-host via standalone binary, Docker Compose, or Kubernetes
Pros & cons
Screenshots
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Installation
Get the Docker Compose example
git clone --depth 1 --filter=blob:none --sparse https://github.com/chattocorp/chatto.git chatto-source && git -C chatto-source sparse-checkout set examples/dockercompose && cp -R chatto-source/examples/dockercompose chatto && rm -rf chatto-source && cd chattoInitialize config with your domain and admin email
./init-env.sh chat.example.com admin@example.comStart the stack (Chatto serves on port 4000; Caddy handles TLS on 80/443)
docker compose up -dFrequently asked questions
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