Mattermost

Open-source self-hosted team chat. Popular Slack alternative for KR/JP manufacturing, finance, and public sector requiring on-premise.

Editor

Sensible when on-prem is required. Solo teams self-hosting should budget real ops time.
— Crewtool Editor

Key Features

• Self-host or cloud • Channels, threads, DMs • Playbooks for incident response • SSO and audit logs • Open-source plugins

Pricing

Self-hosted free, Professional $10/user/mo, Enterprise custom.

FAQ

Slack migration?

Official importer available for Slack JSON exports.

Localization?

Korean and Japanese UI supported.

Free scope?

Self-hosted Free covers basic chat. Professional adds advanced search and Playbooks.

What's the TCO for self-hosting?

Server and ops labor are main costs. Can be cheaper than Slack or more expensive depending on team size and ops expertise.

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