notanothertool

Mattermost

Team Communication · Free · since 2015 · open source

Visit Mattermost ↗ See alternatives Pricing

Mattermost is an open-source Slack alternative that you can self-host. It's popular with organizations that need full control over their data — government, healthcare, finance, and security-conscious startups.

pros

  • Self-hosted — full control over your data
  • Open source with active community
  • Slack-compatible interface, easy migration
  • Strong compliance and security features

cons

  • Requires server management if self-hosting
  • Smaller integration ecosystem than Slack
  • Cloud-hosted version is more expensive than Slack
  • Mobile apps lag behind Slack and Teams in polish

top Mattermost alternatives

Slack Team messaging platform with channels, threads, and integrations for workplace communication. Free Rocket.Chat Open-source communication platform with team chat, video, and omnichannel customer engagement. Free Element Decentralized, end-to-end encrypted messaging built on the Matrix protocol. Free Discord Voice, video, and text communication platform originally built for gaming, now used by communities and teams. Free

All Mattermost alternatives →

Mattermost compared

Slack vs Mattermost · Microsoft Teams vs Mattermost · Discord vs Mattermost · Mattermost vs Rocket.Chat · Mattermost vs Element · Mattermost vs Google Chat · Mattermost vs Lark · Mattermost vs Twist

more team communication tools

Slack Team messaging platform with channels, threads, and integrations for workplace communication. Free Microsoft Teams All-in-one communication platform with chat, video meetings, and Office 365 integration. Free Discord Voice, video, and text communication platform originally built for gaming, now used by communities and teams. Free Rocket.Chat Open-source communication platform with team chat, video, and omnichannel customer engagement. Free Element Decentralized, end-to-end encrypted messaging built on the Matrix protocol. Free Google Chat Team messaging built into Google Workspace with Spaces, threads, and deep Google app integration. $6/user/mo