Mattermost vs Slack Comparison
Mattermost
Starting at $3.25 /User/Month
- Free Trial
- Large Enterprises
- Medium Business
Mattermost is an open source messaging platform that brings all business communication into one place. More than just chat, Mattermost is built around a modern team communication workflow. It includes integrated video co…
Slack
Starting at $2.67 /Month
- Free Trial
- Freelancers / Consultants
- Large Enterprises
Slack is the only unified communication platform for chatting, sharing, and collaborating. Whether in one-on-one conversations or a large group, Slack's threaded conversations keep everyone on the same page. No more emai…
Slack leads on user satisfaction with a 4.5-star rating across 35,011 reviews.
Mattermost vs Slack — at a glance
| Feature | Mattermost | Slack |
|---|---|---|
| Rating | 3.5 / 5 | 4.5 / 5 |
| Reviews | 572 | 35,011 |
| Starting price | $3.25 /User/Month | $2.67 /Month |
| Free trial | Yes | Yes |
| Free version | No | No |
| Best for | Large Enterprises, Medium Business, Small Business | Freelancers / Consultants, Large Enterprises, Medium Business |
| Category | Business Instant Messaging Software | Business Instant Messaging Software |
| Platforms | SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac | SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac |
| API | Available | Available |
| Support modes | Online | Online |
| Certifications | — | SOC 2, HIPAA, GDPR, ISO 27001 |
| Data residency | Global | Global |
Key differences between Mattermost and Slack
- Pricing: Mattermost starts at $3.25 /User/Month, while Slack starts at $2.67 /Month.
- Target audience: Mattermost is built for Large Enterprises and Medium Business, while Slack targets Freelancers / Consultants and Large Enterprises.
- User satisfaction: Slack scores higher with a 4.5-star average.
- Deployment: Mattermost supports SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac; Slack supports SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac.
Mattermost vs Slack — find the better fit before you commit.
Which tool fits your team best
Which is actually cheaper for your team size
Where each product wins, per real buyers
Most Business Instant Messaging Software tools look identical on paper. This comparison cuts to the differences that matter — pricing structure, team fit, and what real buyers found after signing up.
Biggest differences
Features
Pricing
Buying details
Security
Buyer feedback
Integrations
Product tour
Other options
Talk to an expert Talk to an expert |
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Biggest differences
Start here before you go deeper into features.
Large Enterprises, Medium Business, Small Business
Best for streamlined team communication and collaboration across varied company sizes.
- You need a unified platform for both one-on-one and group messaging.
- Your team benefits from threaded conversations to reduce email overload.
- You want a simple, low-complexity setup for remote or cross-functional teams.
- Your organization requires specialized industry compliance features not supported by Slack.
- Your team prefers email-centric workflows over instant messaging platforms.
Mattermost typically suits Large Enterprises and Medium Business. Slack tends to fit Freelancers / Consultants and Large Enterprises better. The right choice depends on your team size, workflow, and whether a free trial matters.
Description | Mattermost is an open source messaging platform that brings all business communication into one place. More than just chat, Mattermost is built around a modern team communication workflow. ... Read More about Mattermost | Slack is the only unified communication platform for chatting, sharing, and collaborating. Whether in one-on-one conversations or a large group, Slack's threaded conversations keep everyone ... Read More about Slack |
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Entry Level Pricing |
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User RatingsBased on verified Spotsaas reviews | ||
Best Company Size | — | 1-50 employees500+ employees |
Get pricing help | Get pricing help |
Software Demo
Demo |
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Compare Mattermost and Slack on pricing
Review starting price, plan structure, and free-trial access side by side so you can see which option fits your budget and buying process.
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Other Details
Organization Types supported |
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API Support |
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Get help choosing | Get help choosing |
Security & Compliance
Certifications, data handling, and security controls for IT and compliance evaluators.
SOC 2 | — | ✓ Yes |
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HIPAA | ✗ No | ✓ Yes |
GDPR | — | ✓ Yes |
ISO 27001 | — | ✓ Yes |
Single Sign-On (SSO) | — | ✓ Yes |
Multi-Factor Auth (MFA) | — | ✓ Yes |
Data Encryption | — | ✓ Yes |
Audit Logs | — | ✓ Yes |
Data Residency | 🌐 Global | 🌐 Global |
Mattermost User Reviews & Rating Comparison
User Ratings | ||
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Rating Distribution | ||
Spotsaas Editor’s POV generated by AI | Buyer sentiment Buyer sentiment is mixed to positive across 34 reviews, with clear strengths and a few common watchouts. What buyers like
Common complaints
| Buyer sentiment Overall, users appreciate Slack for its ease of communication and collaboration but note challenges with pricing and information overload. What buyers like
Common complaints
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Pros and Cons |
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Positive Reviews | No reviews available for the product | No reviews available for the product |
List of Customers
Customers |  Samsung  SAP  Commonwealth Bank |  Slack_customers_0  Slack_customers_1  Slack_customers_2 |
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Media and Screenshots
Screenshots |  4 Screenshots |  7 Screenshots |
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Videos |  4 Videos |  1 Videos |
Top Alternatives to Mattermost and Slack in 2026
Alternatives |
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Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].
Frequently asked questions
- Which is better, Mattermost or Slack?
- Slack edges out the other on user ratings (4.5 vs 3.5). That said, the best pick depends on your use case — use the comparison tables above to evaluate each dimension.
- Do Mattermost and Slack offer a free trial?
- Yes, both Mattermost and Slack offer a free trial.
- What is the starting price of Mattermost vs Slack?
- Mattermost starts at $3.25 /User/Month. Slack starts at $2.67 /Month.
- What are the top alternatives to Mattermost?
- Top alternatives to Mattermost include mi.team, Rocket.Chat, Glip, Zulip, Output Messenger.
- What are the top alternatives to Slack?
- Top alternatives to Slack include Microsoft Teams, Glip, Google Chat, ChatWork, Dialog.