Slack vs Mattermost Comparison
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…
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 leads on user satisfaction with a 4.5-star rating across 35,011 reviews.
Slack vs Mattermost — at a glance
| Feature | Slack | Mattermost |
|---|---|---|
| Rating | 4.5 / 5 | 3.5 / 5 |
| Reviews | 35,011 | 572 |
| Starting price | $2.67 /Month | $3.25 /User/Month |
| Free trial | Yes | Yes |
| Free version | No | No |
| Best for | Freelancers / Consultants, Large Enterprises, Medium Business | Large Enterprises, Medium Business, Small 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 Slack and Mattermost
- Pricing: Slack starts at $2.67 /Month, while Mattermost starts at $3.25 /User/Month.
- Target audience: Slack is built for Freelancers / Consultants and Large Enterprises, while Mattermost targets Large Enterprises and Medium Business.
- User satisfaction: Slack scores higher with a 4.5-star average.
- Deployment: Slack supports SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac; Mattermost supports SaaS/Web/Cloud, Mobile - Android, Mobile - iOS, Installed - Windows, Installed - Mac.
Slack vs Mattermost — 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 |
Biggest differences
Start here before you go deeper into features.
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.
Large Enterprises, Medium Business, Small Business
Slack typically suits Freelancers / Consultants and Large Enterprises. Mattermost tends to fit Large Enterprises and Medium Business better. The right choice depends on your team size, workflow, and whether a free trial matters.
Description | 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 | 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 |
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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 Slack and Mattermost 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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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 | ✓ Yes | ✗ No |
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 |
Slack User Reviews & Rating Comparison
User Ratings | ||
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Rating Distribution | ||
Spotsaas Editor’s POV generated by AI | 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
| Buyer sentiment Buyer sentiment is mixed to positive across 34 reviews, with clear strengths and a few common watchouts. 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 |  Slack_customers_0  Slack_customers_1  Slack_customers_2 |  Samsung  SAP  Commonwealth Bank |
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Media and Screenshots
Screenshots |  7 Screenshots |  4 Screenshots |
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Videos |  1 Videos |  4 Videos |
Top Alternatives to Slack and Mattermost 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, Slack or Mattermost?
- 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 Slack and Mattermost offer a free trial?
- Yes, both Slack and Mattermost offer a free trial.
- What is the starting price of Slack vs Mattermost?
- Slack starts at $2.67 /Month. Mattermost starts at $3.25 /User/Month.
- What are the top alternatives to Slack?
- Top alternatives to Slack include Microsoft Teams, Glip, Google Chat, ChatWork, Dialog.
- What are the top alternatives to Mattermost?
- Top alternatives to Mattermost include mi.team, Rocket.Chat, Glip, Zulip, Output Messenger.