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Mattermost

Open-source, self-hosted Slack alternative for secure team communication.

⭐ 4.1/5Free Tier AvailableOpen SourceFounded 2016
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About Mattermost

Mattermost is an open-source messaging platform that provides a secure, self-hosted alternative to Slack. It's popular among organizations with strict security requirements, including government agencies and financial institutions. Mattermost offers channels, direct messaging, file sharing, and integrations while keeping all data under your control.

Key Features

✓Channels
✓Direct messaging
✓File sharing
✓Integrations
✓Playbooks
✓Boards
✓Self-hosting
✓DevOps tools
✓SSO/LDAP
✓Compliance

Pros & Cons

👍 Pros

  • ✓Open source
  • ✓Self-hosted
  • ✓High security
  • ✓Slack-like interface

👎 Cons

  • ✗Requires hosting
  • ✗Fewer integrations
  • ✗Complex setup
  • ✗Smaller ecosystem
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Best Mattermost Alternatives

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Slack

Business communication platform for team messaging and collaboration.

Free Tier⭐ 4.4
90-day message history7 alternatives
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Rocket.Chat

Open-source communication platform for teams.

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Element

Secure messaging app built on the Matrix protocol.

Free TierOpen Source⭐ 3.9
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Zulip

Open-source team chat with unique topic-based threading.

Free TierOpen Source⭐ 4
Free (self-hosted or cloud)4 alternatives

Compare Mattermost

Mattermost vs Slack→Mattermost vs Rocket.Chat→Mattermost vs Element→Mattermost vs Zulip→