Mattermost is a secure, self-hosted collaboration platform designed for mission-critical environments that require complete data control. While primarily built for enterprise teams in defense, government, and critical infrastructure, community builders in regulated industries or security-conscious organizations use it to create sovereign chat-based communities. The platform offers messaging, file sharing, workflow automation, and integrations while ensuring all data remains on-premises or in private clouds, making it ideal for professional associations, developer communities, and enterprise customer communities that need strict security controls.
Founded
2014
Team Size
147
6%
Funding
Series B
$73.6M total
Monthly Traffic
422,000
4%
Secure Developer Communities
Host private developer communities for open source projects or enterprise development teams requiring secure, self-controlled communication channels
Professional Association Networks
Create secure member communication channels for professional associations handling sensitive industry discussions or regulated content
Enterprise Customer Communities
Build customer communities for B2B companies in regulated industries (defense, healthcare, finance) that require complete data control and sovereignty
Government & Public Sector Communities
Facilitate secure collaboration for government agencies, military units, and public sector organizations requiring air-gapped or classified communication environments

Secure, self-hosted messaging and collaboration platform built on Matrix protocol for privacy-focused communities

Open-source, self-hosted chat platform for security-conscious communities requiring data sovereignty and compliance
Open source voice chat server for gaming communities and Discord-style voice channels with self-hosting control
Self-hosted group chat for communities who want to own their data and avoid subscription fees
Voice, video, and text chat platform where community builders create servers with organized channels for engagement
Self-hosted voice communication platform for gaming and professional communities with military-grade security.