The Open Source Slack Alternative
More than just channel-based messaging. Mattermost gives you everything you need to accelerate mission-critical workflows, complete with on-prem options for full data sovereignty.
Teams that use Mattermost instead of Slack
Designed for the way mission-critical teams work
Why choose Mattermost over Slack
Find out why mission-critical organizations choose Mattermost over Slack.
Versatile Collaboration
- Flexible tools designed for the way your team works.
- Fewer fragmented tools + robust workflows makes complex operations easy.
Open Source
- Customize your workspace to your specific needs.
- Innovation and support from a vibrant OSS community of developers.
On-Prem Deployment
- Deploy behind your firewall for superior security and increased resilience.
- The only collaboration solution where you can maintain data control and sovereignty.
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The flexibility and extensibility that Slack lacks
Your tools should adapt to fit the way your team works. Mattermost is the only open source collaboration platform that gives you the ability to customize, extend, and build bespoke integrations — including with legacy systems.
- 25,000+ GitHub Stars
- 30,000+ total contributions
- 4,000+ contributors
More deployment options than Slack
From government agencies and critical infrastructure organizations to financial services and healthcare companies, teams in high-security and regulated industries trust Mattermost for secure collaboration.
Choose from on-prem and private cloud deployment options that meet your security and compliance needs and give you full control and sovereignty over your data at all times. Deploy in air-gapped and other high-security environments, use EMM for secure mobile comms, and define granular controls for enterprise data archiving to keep data properly secured and accessed.
Designed for agile teams
Mattermost goes beyond general-purpose collaboration with features designed to help technical teams collaborate on code, execute sprints, deploy releases, accelerate DevSecOps and ChatOps workflows, and manage incident response.
Channel-based collaboration with powerful automation and tool integrations to raise messaging to the level of a CLI.
Playbooks for structured workflows that require repeatable execution with predictable outcomes.
Robust integrations with essential technical tools surface the exact functionality your team needs, when they need it, for better context and faster response times.
Find out what the community is saying about migrating from Slack to Mattermost.
Don’t just take our word for it
Mattermost vs. Slack Platform Comparison
Learn why technical teams and organizations prefer Mattermost for mission-critical workflows and collaboration.