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Mattermost vs Slack: Pricing Comparison 2026

Side-by-side pricing comparison of Mattermost and Slack. See all plans, features, and costs at a glance.

Bottom line: Both Mattermost and Slack offer free plans. Mattermost has 4 pricing tiers while Slack has 4.

Last updated: July 6, 2026

Data compiled by Arthur Jacquemin
Updated July 6, 2026
Try Mattermost freeTry Slack freeUpdated this monthPrice updated 11d ago

Mattermost vs Slack: Quick Pricing Facts

FeatureMattermostSlack
Starting PriceCustom pricing$8.75/mo
Number of Plans44
Free TierYesYes
Pricing Modelopen-sourceper-seat
Annual DiscountN/AN/A

Mattermost and Slack are both priced at Custom pricing, making them equally accessible Communication tools. Together they offer 8 pricing plans with 93 features compared, so the best choice comes down to which features match your needs.

Both tools offer free plans, making them accessible for teams on a budget. Mattermost uses open-source pricing while Slack uses per-seat pricing, which may affect your total cost at scale.

Review the detailed tier-by-tier comparison above to see exactly which features are included at each price point and find the best fit for your Communication needs.

Pricing Plans
Mattermost
Mattermost
Try free
Slack
Tier 1
Free
$0/monthCheapest
Includes
  • Limited-use edition of Enterprise Advanced for technical evaluation
Start with Free
Free
$0/monthCheapest
Includes
  • 90 days of message history
  • Up to 10 apps
  • 1:1 meetings
  • 1:1 external messages
  • Basic AI
  • AI conversation summaries
  • Slackbot (personal AI agent)
  • AI workflow generation
  • AI search
  • AI daily recaps
  • AI file summaries
  • SAML-based single sign-on
  • SCIM user management
  • EMM integration support
  • Native data loss prevention
Start with Free
Tier 2
Professional
Custom pricing
Includes
  • Channel-based collaboration
  • Messaging, file sharing, and link and file previews across device platforms
  • 1:1 audio calls and screen sharing
  • Threaded discussions
  • Core search up to 3 million posts
  • Custom branding, themes, and emojis
  • Multi-team collaboration
  • Guest accounts
  • Single sign-on
  • Professional Support
Start with Professional
Pro
$9/monthCheapest
Includes
  • Unlimited message history
  • Unlimited app integrations
  • Group meetings
  • Group external messages
  • Basic AI
  • AI conversation summaries
  • Slackbot (personal AI agent)
  • AI workflow generation
  • AI search
  • AI daily recaps
  • AI file summaries
  • SAML-based single sign-on
  • SCIM user management
  • EMM integration support
  • Native data loss prevention
Start with Pro
Tier 3
Enterprise
Custom pricing
Includes
  • Everything in Professional, Plus:
  • Agentic Platform
  • Real-time channel briefing
  • AI-enhanced Search and RAG
  • Video Integrations
  • Federated Communications
  • Workflow automation
  • Compliance export and eDiscovery automation
  • Scale to 50,000 concurrent users
  • Enterprise Support
  • U.S. Based Premier Support
Start with Enterprise
Business+Popular
$18/monthCheapest
Includes
  • Unlimited message history
  • Unlimited app integrations
  • Group meetings
  • Group external messages
  • Advanced AI
  • AI conversation summaries
  • Slackbot (personal AI agent) NEW
  • AI workflow generation
  • AI search
  • AI daily recaps
  • AI file summaries
  • SAML-based single sign-on
  • SCIM user management
  • EMM integration support
  • Native data loss prevention
Start with Business+
Tier 4
Enterprise Advanced
Custom pricing
Includes
  • Everything in Enterprise, Plus:
  • Security-Optimized Mobility
  • Mobile Data-at-Rest Encryption
  • Zero Trust Security
  • Dynamic Attribute Based Access Controls
  • Automatic channel translations
  • Scale to 200,000 concurrent users
  • Dedicated write-through caching
  • Air-gapped Deployment
  • Mobile Screenshot Prevention
  • Mission Partner Environments
Start with Enterprise Advanced
Enterprise+
Custom pricing
Includes
  • Unlimited message history
  • Unlimited app integrations
  • Group meetings
  • Group external messages
  • Enterprise-Grade AI
  • AI conversation summaries
  • Slackbot (personal AI agent) NEW
  • AI workflow generation
  • Enterprise search
  • AI daily recaps
  • AI file summaries
  • Multiple SAML configurations
  • SCIM user management
  • EMM integration support
  • Native data loss prevention
Start with Enterprise+

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Mattermost

Open-source self-hosted team messaging platform

View all Mattermost plans

Slack

Channel-based messaging platform for teams

View all Slack plans

What Reviewers Say

Which Should You Choose?

Choose Mattermost if:

  • •You need a self-hosted team messaging platform for data sovereignty, compliance, or air-gapped environments
  • •Mattermost's open-source core lets you audit code, customize functionality, and avoid vendor lock-in
  • •Your organization operates in regulated industries (defense, healthcare, finance) requiring on-premises deployment
  • •Mattermost's playbooks and incident management features serve DevOps and SRE teams natively

Choose Slack if:

  • •You want the best team messaging UX with a polished interface, threaded conversations, and intuitive channels
  • •Slack's ecosystem of 2,600+ app integrations covers virtually every business tool
  • •Slack Connect enables secure cross-company collaboration with external partners and clients
  • •Your team values the community, workflow builder, and Canvas features that Slack continues to develop

Mattermost and Slack compete for team messaging, but their target buyers differ. Slack is the market leader for cloud-hosted team communication. Free gives 90 days of message history. Pro at $8.75/user/month adds unlimited history, group calls, and external collaboration. Business+ at $12.50/user/month adds SAML SSO, compliance exports, and advanced identity management. Mattermost offers self-hosted and cloud deployment. Free (self-hosted) includes unlimited messages, channels, and integrations. Professional at $10/user/month adds SSO, guest accounts, and advanced permissions. Enterprise adds compliance, high availability, and custom retention policies. Mattermost's core advantage is deployment flexibility. Self-hosted Mattermost runs on your servers, behind your firewall, with your encryption keys. This is not a preference - it is a requirement for defense contractors, government agencies, healthcare organizations, and any entity with strict data residency laws. Mattermost also has native DevOps features: incident playbooks, tool integrations, and workflow automation designed for engineering teams. Slack's advantages are UX and ecosystem. The messaging experience is more polished, the 2,600+ integration marketplace is unmatched, and Slack Connect's cross-company collaboration is a unique capability. For organizations without self-hosting requirements, Slack's cloud experience is superior. Choose Mattermost when self-hosting, open-source, or regulatory compliance is required. Choose Slack for the best cloud messaging experience and integration ecosystem.

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Frequently Asked Questions: Mattermost vs Slack

How many pricing plans does Mattermost have vs Slack?
Mattermost offers 4 pricing plans, while Slack offers 4 plans. More plans typically means more flexibility to match your exact needs and budget.
Does Mattermost or Slack offer a free plan?
Yes, both Mattermost and Slack offer free plans. Compare the feature limits of each free tier to see which better fits your use case before upgrading.
What is the most popular Slack plan?
The Business+ plan is Slack's most popular tier, priced at $18/mo. Key features include Unlimited message history, Unlimited app integrations, Group meetings.
Does Mattermost or Slack offer custom enterprise pricing?
Yes, both Mattermost and Slack offer custom enterprise pricing tiers with quote-based pricing. Contact each vendor for a tailored quote.
What pricing models do Mattermost and Slack use?
Mattermost uses a open-source pricing model, while Slack uses per-seat pricing. The right model depends on your team size and usage patterns.
How do Mattermost and Slack compare for Communication?
Both Mattermost and Slack are Communication tools. Mattermost offers 4 plans starting at Custom pricing, while Slack offers 4 plans starting at $8.75/mo. Review the feature breakdowns above to see which better fits your Communication needs.
AI Recommendations

Sources

  1. Mattermost Official Pricing- Vendor pricing page
  2. Slack Official Pricing- Vendor pricing page

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