Mattermost vs Slack MCP Server: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Mattermost and Slack MCP Server side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Mattermost
Open-source team collaboration platform
Slack MCP Server
Official MCP server for Slack, search channels, summarize threads, and draft messages
| At a Glance | Mattermost | Slack MCP Server |
|---|---|---|
Starts at | Free plan, paid from $10/user/mo, billed monthly Professional plan | Free 100% free |
Category | Communication Team Chat | Communication Productivity |
Rating | 4.3/5 G2 4.3 · Capterra 4.4 · SourceForge 4.3 604 reviews | n/a |
Free plan | Yes | Yes |
Choose Mattermost or Slack MCP Server?
Choose Mattermost if
- You need communication features specifically.
Choose Slack MCP Server if
- You need communication features specifically.
In-Depth Analysis
Mattermost
Open-source team collaboration platform
Mattermost's pricing is fair, offering a generous Free tier for small teams.
Strengths
- Pro: Open source Slack alternative
- Pro: Self-hostable
- Pro: Good for compliance
- Pro: No per-user cloud cost
- Pro: Customizable
Weaknesses
- Con: Less polished than Slack
- Con: Smaller integration library
- Con: Self-hosting required for best value
- Con: Learning curve
- Con: Community smaller
Key features
Slack MCP Server
Official MCP server for Slack, search channels, summarize threads, and draft messages
The pricing for Slack MCP Server is exceptionally generous, offering a fully functional "Open Source" tier for free.
Strengths
- Pro: Catch up on missed conversations instantly
- Pro: AI drafts match your team communication style
Weaknesses
- Con: Requires Slack bot token with appropriate scopes
- Con: Write access can send messages, scope carefully
Key features
Plans and prices: Mattermost vs Slack MCP Server
| Tool | Plans and prices | Source |
|---|---|---|
| Mattermost |
| mattermost.com/pricing read Sep 30, 2026 |
| Slack MCP Server |
| github.com/modelcontextprotocol/servers-archive… read Oct 27, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Mattermost pricing and Slack MCP Server pricing.
Key Takeaways
Mattermost
- Worth considering for communication
Slack MCP Server
- Worth considering for communication
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Only Mattermost has a published user rating (4.3/5 from 604 reviews); Slack MCP Server has none we can show.
- Mattermost starts at $10/user/mo, billed monthly; Slack MCP Server has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Mattermost and Slack MCP Server compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Only Mattermost has a published user rating (4.3/5 from 604 reviews); Slack MCP Server has none we can show. Mattermost starts at $10/user/mo, billed monthly; Slack MCP Server has no public paid plan price on file. Both have a free plan.
What are Mattermost and Slack MCP Server used for?
Mattermost: Open-source team collaboration platform. Slack MCP Server: Official MCP server for Slack, search channels, summarize threads, and draft messages.
What does Mattermost cost vs Slack MCP Server?
Mattermost's cheapest paid plan is Professional at $10/user/mo, billed monthly; it also has a free plan. Slack MCP Server is free. Prices read on the vendors' pricing pages, latest check Oct 27, 2026.
What's the main difference between Mattermost and Slack MCP Server?
Mattermost's main strength: open source Slack alternative. Slack MCP Server's main strength: catch up on missed conversations instantly.
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