Mattermost vs Slack: Which Team Messaging Is Better in 2026?
Compare pricing, features, integrations, verified reviews, AI capabilities, security, and customer satisfaction, side by side, with no marketing spin.
The Short Answer
Mattermost vs Slack, in 15 seconds
Choose Mattermost if…
- You prefer Mattermost's approach and ecosystem
Choose Slack if…
- You depend on a broad integration ecosystem
- You want deeper AI and automation features
- You have strict security & compliance needs
- You need the broader feature set
Head-to-Head Scorecard
How Mattermost and Slack score
Slack leads on 4 of 9 measured dimensions.
- Even
Customer Rating
Average score from verified user reviews
MattermostNo reviewsSlackNo reviews - Even
Review Volume
Number of verified reviews, a proxy for adoption
Mattermost0Slack0 - Even
Entry Pricing
Lowest published starting price (free plan = lowest)
Mattermost$10/moSlack$7/mo - Even
Free Access
Availability of a free plan and/or free trial
MattermostFree plan + trialSlackFree plan + trial - Slack
Integrations
Number of listed third-party integrations
Mattermost6Slack10 - Slack
Features
Number of listed product capabilities
Mattermost6Slack12 - Slack
AI Features
Capabilities mentioning AI, automation or ML
Mattermost,Slack1 - Slack
Security & Compliance
Number of listed compliance certifications
Mattermost4Slack5 - Even
Platforms & Deployment
Supported platforms and deployment options
Mattermost8Slack8
Feature Comparison
Mattermost vs Slack feature breakdown
Search or filter the full feature matrix, core features, AI, integrations, APIs, security and compliance.
Mattermost
SlackPricing Comparison
Mattermost vs Slack pricing
Entry pricing, plan tiers and the cost factors that shape total cost of ownership.
Mattermost
$10/mo to start- Team messaging
- Self-host anywhere
- Integrations
- Community support
- Advanced permissions
- Guest accounts
- SAML SSO
- Playbooks
- Advanced compliance & audit
- High availability
- FedRAMP option
- Premium support & SLA
Slack
$7/mo to start- 90 days message history
- 10 app integrations
- 1:1 huddles
- Basic search
- Unlimited history
- Unlimited integrations
- Group huddles
- Workflow Builder
- Everything in Pro
- SAML SSO
- Compliance exports
- User provisioning (SCIM)
- Multiple workspaces
- Advanced security and compliance
- HIPAA and FedRAMP options
- Enterprise key management
Total cost of ownership factors
Beyond list price, factor in implementation, training, add-ons and per-seat scaling when estimating total cost of ownership.
Pros & Cons
Mattermost vs Slack: strengths and trade-offs
Mattermost
Pros
- Free plan available
- Free trial offered
- Compliance: SOC 2 Type II, GDPR, ISO 27001
- Public API available
Cons
- Higher starting price ($10/mo)
- Fewer native integrations than the alternative
Slack
Pros
- Free plan available
- Free trial offered
- Lower starting price ($7/mo)
- Broad integration ecosystem (10)
- Compliance: SOC 2, ISO 27001, GDPR
- Stronger AI / automation features
Cons
Buyer Fit
Who should use Mattermost vs Slack?
Startups
Either
Either keeps early-stage costs lowest with its entry tier.
Small businesses
Either
Either offers the most accessible pricing for lean teams.
Agencies
Slack
Slack connects to more tools for multi-client workflows.
Enterprises
Slack
Slack leads on compliance and breadth for complex needs.
Ecommerce
Slack
Slack integrates with more of the commerce stack.
SaaS companies
Slack
Slack is the more developer- and automation-friendly choice.
Integration overlap
Shared integrations (3)
Only in Mattermost (3)
Only in Slack (7)
Ask SIA which solution fits your business
SIA, Saaskart's AI buying assistant, weighs Mattermost and Slack against your team size, budget, integrations and compliance needs, then recommends the right fit and the questions to ask each vendor.
Get a personalised recommendationMattermost vs Slack, Frequently Asked Questions
What is the difference between Mattermost and Slack?
Mattermost and Slack are both Team Messaging solutions. Mattermost is rated 0.0/5 by 0 users, while Slack is rated 0.0/5 by 0 users. The main differences lie in pricing, features, and target audience.
Which is better, Mattermost or Slack?
Based on user ratings, Mattermost scores higher at 0.0/5. The best choice depends on your team size, budget, and specific requirements.
Which is cheaper, Mattermost or Slack?
Slack is the more affordable option, starting at $7/month.
Does Mattermost or Slack have a free plan?
Mattermost offers a free plan. does not have a free tier but does offer a free trial.
Can I switch from Mattermost to Slack?
Switching between Mattermost and Slack is possible. Both support data export. Check integration compatibility and plan for data migration to minimise disruption to your team.
Who should use Mattermost vs Slack?
Mattermost is best suited for teams that prioritise enterprise features. Slack works well for teams looking to start free and scale.
Our Verdict
The bottom line on Mattermost vs Slack
Best Overall
Either
It's a tie balances user satisfaction and proven adoption.
Best for Startups
Either
It's a tie has the friendliest entry point for new teams.
Best for Enterprise
Slack
Slack leads on compliance and feature breadth.
Best Value
Either
It's a tie delivers the lowest cost to get started.
Best AI Features
Slack
Slack ships more AI and automation.
Highest Rated
Either
Both earn equal user ratings.