Skip to main content
CompareTiers
Compare Now
Communication

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: March 16, 2026

Data compiled by Arthur Jacquemin
Updated March 16, 2026
Try Mattermost freeTry Slack free

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 it 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+

Swipe to compare plans →

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

Our Pick

Slack

Slack offers a free plan.

Based on pricing data only. Review the full comparison below for your specific needs.

Best value: Slack

Try Slack free

Which Should You Choose?

Choose Mattermost if:

  • •You prefer Mattermost's free tier features—Limited-use edition of Enterprise Advanced for technical evaluation
  • •You prioritize Mattermost's user experience and interface over price (both tools are similarly priced)
  • •You prefer Mattermost's open-source model with its 4-tier structure

Choose Slack if:

  • •You prefer Slack's free tier features—90 days of message history, Up to 10 apps
  • •You want more features built-in—Slack offers 27 additional features across its plans
  • •You prioritize Slack's user experience and interface over price (both tools are similarly priced)

Both Mattermost and Slack offer free plans [1], eliminating cost barriers for evaluation. This means you can test both tools thoroughly with your actual workflows before any financial commitment. The free tiers differ in scope: Mattermost includes 1 features, while Slack includes 15 features. Evaluate which free tier matches your evaluation needs before deciding to upgrade. Your best approach is to activate both free trials and evaluate which tool's workflow, integrations, and user experience align better with your team's needs before committing to paid plans.

ShareShare

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.

Sources

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

Related Articles

Best Communication Tools Pricing Compared (2026)

Communication tool pricing: Slack ($8.25-12.50/user), Teams ($4-12.50/user w/ 365), Discord (free), Zoom ($16/host), Google Meet (free), Loom ($8-25/user). Comparison guide.

Best Collaboration Tools Pricing Compared (2026)

Slack ($0-$12.50/user), Teams ($6-$12.50/user), Notion ($0-$10/user), Asana ($0-$30.49/user), Monday.com ($0-$24/user). Compare per-seat costs and free tiers.

Annual vs Monthly SaaS Pricing: When to Commit? (2026)

Annual vs monthly SaaS billing comparison. Average 20–30% savings with annual plans. Risk analysis, refund policies, and commit framework.

Track Price Changes

Get notified when pricing changes for these tools.

See all Mattermost alternativesSee all Slack alternativesCommunicationCompare more tools