MattermostThis page
- Focus
- Self-hosted team messaging focused on secure collaboration for engineering teams.
- Hosting
- Self-hostable
- License
- MIT
Mattermost
- Type
- Hosting
- Self-hostable
- License
- MIT
- Replaces
Quick verdict
Use when
Pick it as the closest drop-in Slack replacement when data residency and self-hosting matter.
Skip when
Skip when you need a fully managed SaaS with zero operations work.
Try instead
- Rocket.Chat — Open-source team chat and omnichannel platform with channels, video, and customer messaging.
- Zulip — Topic-threaded open-source team chat built for asynchronous, low-noise discussion.
- Stoat — Self-hosted Discord-style chat platform with servers, channels, roles, and LiveKit voice.
Mattermost vs common alternatives
Stable selection factors from this listing—focus, hosting, license, and access. Confirm live details on each official site.
Slack
- Focus
- Commercial team messaging and collaboration platform.
- Hosting
- Commercial SaaS
- License
- Proprietary (typical SaaS)
| Dimension | Mattermost | Slack |
|---|---|---|
| Focus | Self-hosted team messaging focused on secure collaboration for engineering teams. | Commercial team messaging and collaboration platform. |
| Hosting | Self-hostable | Commercial SaaS |
| License | MIT | Proprietary (typical SaaS) |
| Access | Website + GitHub | slack.com |
What is Mattermost?
Mattermost is an open-source Chat & Team Communication project. Self-hosted team messaging focused on secure collaboration for engineering teams. OpenElse lists it as an alternative to Slack, with self-hostable deployment and MIT licensing. Confirm live features, hosting options, and terms on the official site and repository.
What Mattermost provides
Core signals from this OpenElse listing—verify depth on the official site.
Open-source codebase
Source is published on GitHub at github.com/mattermost/mattermost.
Self-hostable
You can run it on your own infrastructure.
MIT license
Distributed under MIT. Read the license text before production use.
Workflow tags
OpenElse tags this listing for slack, team-chat, chatops.
SaaS replacement mapping
Mapped as an open-source option when evaluating replacements for that commercial product.
How to evaluate Mattermost
A practical path from this directory page to a decision.
Scan this listing
Review the one-liner, self-host status, license, and “when to pick it” note for Mattermost.
Open the official site
Visit mattermost.com for product docs, demos, and current feature scope.
Check the repository
Use GitHub for release cadence, issues, stars, and deployment docs before you commit.
Compare siblings
Open other OpenElse tools in the same category or mapped to the same SaaS to see trade-offs.
Who Mattermost is for
Teams leaving Slack
Pick it as the closest drop-in Slack replacement when data residency and self-hosting matter.
Operators who want data control
Mattermost is listed as self-hostable on OpenElse.
Chat & Team Communication buyers
Self-hostable team chat and community platforms instead of Slack or Discord.
When Mattermost is the right pick
Pick it as the closest drop-in Slack replacement when data residency and self-hosting matter. Skip when you need a fully managed SaaS with zero operations work.
Licensing and platform notes
Facts to verify on the official site before you depend on a workflow.
- Self-host status
- Self-hostable on this listing. Verify install paths and supported environments in the project docs.
- License
- MIT. Confirm obligations for SaaS, embedding, and redistribution before shipping.
- Source of truth
- Features and terms are defined on mattermost.com and the GitHub repository—not on this page.
- Affiliation
- This route is a curated OpenElse listing at /tools/mattermost. It is not the official Mattermost product site.
Frequently asked questions
Quick answers about this listing—open a question to read more.
Is Mattermost open source?
Yes. OpenElse lists Mattermost as an open-source project under MIT. Review the license file in the repository for exact terms.
Can I self-host Mattermost?
Yes. OpenElse marks Mattermost as self-hostable. Follow the official docs for install and operations.
What does Mattermost replace?
Mattermost is mapped on OpenElse as an open-source alternative to Slack. Pick it as the closest drop-in Slack replacement when data residency and self-hosting matter.
Is this the official Mattermost website?
No. This is a OpenElse directory page. The official site is https://mattermost.com, and the source repository is https://github.com/mattermost/mattermost.
Where can I find Mattermost source code?
The public repository linked from this listing is https://github.com/mattermost/mattermost.