Chatto open-sources its self-hosted team chat app with encrypted storage, lightweight deployment, and built-in calls

Chatto, a group and team chat app developed over the past year, is now open source and available for anyone to self-host, with quick installation via Homebrew. The app emphasizes a compact, fast interface, low resource use, encrypted data at rest with per-user keys, no third-party tracking, and built-in end-to-end encrypted voice, video, and screen-sharing.

Chatto reflects rising demand for self-hosted collaboration tools as teams seek alternatives to Slack, Teams, and Discord that offer more control over infrastructure and data. Its single-community server model and privacy-first design may appeal to smaller organizations and technical communities, though adoption will depend on reliability, ecosystem integrations, and ease of ongoing administration.