Mattermost is an open-source, self-hostable online chat service with file sharing, search, and third-party application integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack and Microsoft Teams.
The code was originally proprietary, as Mattermost was used as an internal chat tool inside SpinPunch, a game developer studio, but was later open-sourced. The 1.0 was released on October 2, 2015.
The project is maintained and developed by Mattermost Inc. The company generates funds by selling support services and additional features that are not in the open-source edition.
It was also integrated into GitLab as "GitLab Mattermost".
In the media, Mattermost is mostly regarded as an alternative to the more popular Slack. Aside from the in-browser version, there are desktop clients for Windows, MacOS and Linux and mobile apps for iOS and Android.
What is Mattermost?
Mattermost by Mattermost, Inc. is open-source Windows software in the customisation category. It ranks 3rd by popularity among customisation in this catalogue. The first release dates back to 2015. It is written in Go. Besides Windows, it is available for iOS, Linux, macOS and Android.
Installation and requirements
The publisher provides MSI installers for 64-bit and ARM64 Windows. Installation asks for administrator rights. A silent install is possible with the installer’s documented switches. An MSI package is available for deployment with Group Policy, Intune or Configuration Manager.
Updates and version history
The current version is 6.3.1, released on October 15, 2026. The version history goes back to May 11, 2020: 51 releases, all linked to the official files. That is about 7.9 releases a year. The last update is less than a month old.
Popularity and file types
The Chocolatey package has been downloaded 201,785 times. The source code on GitHub (mattermost/desktop) has 2,274 stars. Wikipedia has an article about it in 11 of our languages. Similar programs include PowerToys, Scribus and Rainmeter.
Project description on GitHub: “Mattermost Desktop application for Windows, Mac and Linux”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- MSI package for managed deployment
- Documented silent install
- Frequent updates (about 7.9 a year)
- Also runs on iOS, Linux and macOS
- Mature project (since 2015)
Cons
- Installation needs administrator rights
In short: Mattermost is an open-source customisation tool for 64-bit and ARM64 PCs. It is actively maintained. Administrators can deploy it unattended.
Screenshots
Is Mattermost safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
5F47B75874680F944539F4C33BE60DE83A4572180FE0A40848669932DB88D2B8· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Security practices (OpenSSF Scorecard)
Automated checks of the mattermost/desktop repository on GitHub by the Open Source Security Foundation, last run on October 24, 2026.
- Actively maintained10
- Dependency update tool10
- Security policy10
- Code review10
- No dangerous workflows10
- No binaries in the repository10
- Static code analysis10
- Licence declared10
- Tests in CI10
- Contributors from several organisations10
- Pinned dependencies9
- Branch protection5
- Restricted token permissions0
- OpenSSF Best Practices badge0
- No known vulnerabilities0
- Signed releases0
- Fuzzing0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 51 versions ›51 versions over 6 years · about 7.9 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 6.3.1Latest | October 15, 2026 | — | 64-bit MSIARM64 MSI |
| 6.3.0 | August 13, 2026 | — | ARM64 MSI64-bit MSI |
| 6.2.2 | June 23, 2026 | — | ARM64 MSI64-bit MSI |
| 6.0.4 | January 20, 2026 | 203.1 MB | 64-bit EXE (NSIS)ARM64 MSIARM64 EXE (NSIS)64-bit MSI |
| 6.0.3 | January 16, 2026 | 203.1 MB | 64-bit EXE (NSIS)ARM64 EXE (NSIS)ARM64 MSI64-bit MSI |
| 6.0.2 | December 10, 2025 | 202.8 MB | ARM64 MSIARM64 EXE (NSIS)64-bit MSI64-bit EXE (NSIS) |
| 6.0.1 | November 18, 2025 | 188.8 MB | ARM64 EXE (NSIS)64-bit EXE (NSIS)64-bit MSIARM64 MSI |
| 6.0.0 | November 13, 2025 | 188.8 MB | ARM64 MSIARM64 EXE (NSIS)64-bit EXE (NSIS)64-bit MSI |
Install from the command line
Silent install ›winget install --id Mattermost.MattermostDesktop -echoco install mattermost-desktop -yscoop install extras/mattermostmsiexec /i mattermost-desktop-6.3.1-win-x64.msi /qn /norestartmsiexec /x {E8B4499C-4C77-433A-A508-4FC444B06FD9} /qn /norestartRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask mattermostflatpak install flathub com.mattermost.DesktopInformation
- Publisher
- Mattermost, Inc.
- Category
- Customisation
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/mattermost/desktop
- Written in
- Go
- Content rating
- All ages
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- MSI
- Other platforms
- iOS, Linux, macOS, Android
- Version
- 6.3.1
- Released
- October 15, 2026
- First release
- 2015
- Added to the catalogue
- March 30, 2021
- Versions listed
- 51
- Updates / year
- 7.9
- Chocolatey downloads
- 201,785
- GitHub stars
- 2,274
- GitHub forks
- 990
- Website
- mattermost.com
- winget ID
- Mattermost.MattermostDesktop
- Chocolatey package
- mattermost-desktop
- Scoop package
- extras/mattermost
- MSI product code
- {E8B4499C-4C77-433A-A508-4FC444B06FD9}
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Mattermost free?
Yes. Mattermost is open-source software under the Apache-2.0 licence.
Is Mattermost safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Mattermost with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Mattermost be installed silently?
Yes. The silent install page lists the exact command for each installer, including msiexec for the MSI package.
Does Mattermost run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Mattermost?
The versions page lists all 51 versions with links to their official installer files, back to May 11, 2020.
What are alternatives to Mattermost?
PowerToys, Scribus, Rainmeter, TranslucentTB and Lively Wallpaper. The alternatives page compares them.
