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Head-to-head · Team Chat Apps

Slack vs Mattermost

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Slack #2 in Team Chat Apps 9.3/10 Free plan Free plan✓ 2 of 2 features Visit Slack
Mattermost #4 in Team Chat Apps 8.9/10 Free plan Free plan✓ 2 of 2 features Visit Mattermost

Slack leads on 0 checks, Mattermost on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSlack · 9.3/10
  • Free planboth

Slack scores higher on our rubric for team chat apps: 9.3 against 8.9 out of 10; our editors rank them #2 and #4.

On message history, Mattermost gives you Unlimited where Slack offers Limited.

Slack is the better fit for integration-heavy teams. Mattermost is the better fit for self-hosted technical teams.

  • Slack fits best

    Integration-heavy teams

  • Mattermost fits best

    Self-hosted technical teams

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Side by side

Feature Slack 9.3/10 Visit ↗ Mattermost 8.9/10 Visit ↗
At a glance
Editor score 9.3 8.9
Ranking #2 in Team Chat Apps #4 in Team Chat Apps
Best for Integration-heavy teams Self-hosted technical teams
Pricing model Free plan + paid Free plan + paid
Starting price $7.25/user/mo —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Mobile Cloud, Self-hosted, Desktop, Mobile
Platforms Web, Windows, macOS, Linux, iOS, Android Web, Windows, macOS, Linux, iOS, Android
Support Docs · 24/7 Email, Tickets, Community, Docs
Compliance SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML, 2FA ISO 27001, GDPR
Integrations 2,600+ integrations 700+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Slack 2/2 · Mattermost 2/2
Channels ✓ ✓
Guest access ✓ ✓
Specs
Message history Limited Unlimited
Integrations Salesforce, Jira, Google Drive, ChatGPT, Asana, Miro, Notion, Zoom, GitHub, GitLab, PagerDuty, Box, Dropbox, Zendesk, Freshdesk, HubSpot GitHub, GitLab, Jira, Microsoft Teams, Microsoft 365, Outlook, ServiceNow, Zoom, Pexip, Splunk, Zapier
Supported platforms web, windows, macos, linux, ios, android, api web, Windows, macOS, Linux, iOS, Android, API, self-hosted
Maximum members Not checked yet Not checked yet
Our review
Pros
  • Channels, direct messages, huddles, guests, and Slack Connect
  • Broad integrations with Salesforce, Jira, GitHub, and other tools
  • Workflow automation, AI features, and enterprise administration
  • Self-hosting supports on-premises, private-cloud, and air-gapped deployments
  • Combines messaging, calls, boards, automation, APIs, and AI agents
  • Integrates with GitLab, GitHub, Jira, Jenkins, and Microsoft Teams
Cons
  • The Free plan includes only 90 days of message history
  • Paid access starts at $7.25 per user per month on annual billing
  • Enterprise+ requires contacting sales for pricing
  • Entry limits message history to 10,000 messages
  • Paid Professional and Enterprise plans require sales contact
  • Advanced capabilities are concentrated in higher-tier plans
Our verdict

Slack organizes workplace communication around public and private channels, direct messages, shared spaces, and Slack Connect external messaging. It is aimed at teams that need structured conversations alongside searchable message and file…

Read the review →

Mattermost is an open-source collaboration platform for technical, operational, defense, and critical-infrastructure teams. It brings public and private channels, direct and group messaging, file sharing, threaded discussions, search,…

Read the review →
  1. SlackTeam Chat Apps 9.3Free plan
  2. MattermostTeam Chat Apps 8.9Free plan

Strengths and trade-offs

  • Slack — where it wins

    • Channels, direct messages, huddles, guests, and Slack Connect
    • Broad integrations with Salesforce, Jira, GitHub, and other tools
    • Workflow automation, AI features, and enterprise administration

    Where it doesn't

    • The Free plan includes only 90 days of message history
    • Paid access starts at $7.25 per user per month on annual billing
    • Enterprise+ requires contacting sales for pricing

  • Mattermost — where it wins

    • Self-hosting supports on-premises, private-cloud, and air-gapped deployments
    • Combines messaging, calls, boards, automation, APIs, and AI agents
    • Integrates with GitLab, GitHub, Jira, Jenkins, and Microsoft Teams

    Where it doesn't

    • Entry limits message history to 10,000 messages
    • Paid Professional and Enterprise plans require sales contact
    • Advanced capabilities are concentrated in higher-tier plans

More comparisons

All team chat apps comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update