Mattermost
mattermost.com
An open source collaboration platform providing secure messaging, workflow automation, audio/screensharing, and project management with a REST API for integrations.
The Mattermost API has contact sales pricing; offers a free tier (Free limited-use edition of Enterprise Advanced for technical evaluation (Try Mattermost Entry)). Verified 2026-07-12 with per-field source links.
Base URL
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no sourceAuth
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no sourceFree tier
Free limited-use edition of Enterprise Advanced for technical evaluation (Try Mattermost Entry)
mattermost.com ↗Pricing
Professional and Enterprise plans are priced via 'Contact Sales'/'Get Pricing'; no public prices listed. Professional supports max 250 users.
mattermost.com ↗Rate limits
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no sourceOpenAPI spec
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no sourceMCP server
Universal Connector with Model Context Protocol (MCP) support is offered in the Enterprise plan (Mattermost as MCP host, not a public MCP server for its API)
mattermost.com ↗