Mattermost / mattermost.com
AI-powered open-source team messaging platform providing AI smart summaries, playbook automation, and secure self-hosted communication for government, defence, and regulated industries.
Pricing
Free
Free plan
Yes
Category
Productivity
Platforms
6
Free plan
Yes
API access
Yes
Open source
Yes
Platforms
6
Mattermost is an open-source team messaging platform providing Slack-like messaging with self-hosted deployment for government agencies, defence contractors, and regulated industries. AI Smart Summaries generate channel message catch-ups. Integration with on-premise AI models enables private AI. Playbooks provide structured incident response workflows. FedRAMP authorisation enables US government use. With US Defence and government deployment, Mattermost validates as secure messaging for demanding security requirements.
Mattermost AI runs as llm assistant software built around text workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, ios, and android, with API access for teams that want to embed it into their own products.
The capabilities that matter most for teams evaluating Mattermost AI.
AI channel message summaries for catch-up without reading every message.
Complete data sovereignty with all messages on customer servers.
US government security compliance enabling sensitive government messaging.
Free self-hosted. Cloud from $10/user/month. Enterprise custom.
Model
Open Source
Starting price
Free
Free trial
No
Slack (covered) provides widely deployed cloud messaging. Microsoft Teams (rank 871) provides enterprise collaboration. Rocket.Chat provides another open-source alternative.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
On-premise AI, OpenAI (optional)
Platforms
Web, iOS, Android, macOS, Windows, Linux
Deployment
Open Source, SaaS
Integrations
GitHub, GitLab, Jira, PagerDuty, Zoom, API
Team Collaboration
Yes
Launch Year
2023
Compliance signals and data-handling notes as reported by the vendor.
SOC 2 Type II. ISO 27001. GDPR compliant. FedRAMP High. ITAR compliant.
Message data processed on customer self-hosted infrastructure. FedRAMP High for US government cloud deployments.
Verified reviews from signed-in users, stored in the backend and averaged into this tool's rating.
Editorial Verdict
Mattermost is the best AI team messaging for government, defence, and regulated industries needing self-hosted sovereignty, FedRAMP compliance, and on-premise AI.
Last verified July 24, 2026.
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Free self-hosted. Cloud from $10/user/month. Enterprise custom.
Community (free self-hosted). Starter $2/user/month. Pro $7/user/month. Enterprise custom.
SOC 2 Type II. ISO 27001. GDPR compliant. FedRAMP High. ITAR compliant.
SOC 2 Type II. GDPR compliant. Enterprise data handling agreements.
Message data processed on customer self-hosted infrastructure. FedRAMP High for US government cloud deployments.
Message data processed on customer self-hosted infrastructure or Rocket.Chat cloud.
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