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Mattermost vs Slack
Slack is a hosted SaaS with a large app directory; Mattermost can be self-hosted.
SlackTeam chat with channels, threads and integrationsWhich to pick
Pick Mattermost if you want…
- Zero-trust, air-gapped team collaboration
- Teams that want Slack-style chat on their own servers
- Open-source code (mattermost/mattermost on GitHub)
- Integrations with REST API, Webhooks or Slash commands (on Mattermost's list, not Slack's)
Pick Slack if you want…
- AI-enhanced team collaboration
- Teams happy with a hosted chat app
- Integrations with Salesforce, Google Drive or ChatGPT (on Slack's list, not Mattermost's)
Mattermost is open source and self-hosted, with channels, threads and DevOps integrations; Slack is a hosted SaaS.
Side by side
- What it is
- Mattermost:Mattermost is a self-hosted, secure team messaging and collaboration platform for mission-critical workflows.
- Slack:Slack is a collaborative workspace that combines chat, AI assistants, and integrations for team communication and workflow automation.
- Best for
- Mattermost:Zero-trust, air-gapped team collaboration
- Slack:AI-enhanced team collaboration
- Who it’s for
- Mattermost:Enterprises, government, and critical-infrastructure teams needing data sovereignty.
- Slack:Teams and organizations that need unified messaging, AI assistance, and app integrations.
- Pricing
- Mattermost:Contact sales
- Slack:Freemium
- Plans
- Mattermost:—
- Slack:Free $0USD · Pro $8.75 per user / month (monthly) · Business+ $18 per user / month (monthly)
- Open source
- Mattermost:Yes, 39,261 GitHub stars
- Slack:—
- Works with
- Mattermost:REST API, Webhooks, Slash commands, Jira, GitHub, GitLab, ServiceNow, PagerDuty
- Slack:Salesforce, Jira, Google Drive, ChatGPT, Atlassian, Zoom, Box, Asana
Mattermost features
- Secure Messaging & Collaboration. Channel-based chat with searchable history, per-channel permissions, and priority messages.
- Workflow Automation. Playbook-driven incident response, change management and compliance with conditional checklists and SLA timers.
- Human-Machine Teaming. Sovereign AI agents that summarize alerts, act on them, and integrate with any LLM you choose.
- Audio & Screenshare. 1-to-1 and group calls with screen sharing, live transcription and AI summaries on your own calls server.
- Project Management Boards. Kanban, table, calendar and gallery boards linked to conversations for task tracking.
- Federation & Interoperability. Secure message federation across Mattermost servers and real-time bridges to Teams, Matrix and XMPP.
Slack features
- Channels & Threads. Organize conversations by project, topic, or team with flexible, searchable channels.
- AI-powered Slackbot. Personal AI agent that answers questions, summarizes conversations, and generates workflows.
- Workflow Builder. Create automated workflows without code, using AI steps and conditional branching.
- Slack Connect. Secure real-time chat with external partners, vendors, and clients.
- Huddles & Video. Built-in audio/video meetings with automatic meeting notes and transcripts.
- App Directory. Access over 2,600 integrations, including Salesforce, Jira, Google Drive, and ChatGPT.
- Enterprise Search. Search across messages, files, and connected apps with AI-enhanced relevance.
- Security & Compliance. Data encryption, SSO, SCIM, DLP, and audit logs to meet enterprise security standards.
Mattermost vs Slack FAQ
Is Mattermost or Slack free?+
Slack has a free plan and paid plans.
Is Mattermost or Slack open source?+
Mattermost is open source (mattermost/mattermost on GitHub). DevHunt has no public source repository on record for Slack.
Do Mattermost and Slack integrate with the same tools?+
Partly. Both list Jira. Mattermost also lists REST API, Webhooks, Slash commands, GitHub and 3 more; Slack also lists Salesforce, Google Drive, ChatGPT, Atlassian and 4 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.