
Mattermost
Mattermost is an open source alternative to Slack.
Mattermost is an open source alternative to Slack designed for Team Collaboration, specifically catering to organizations that require strong security controls and large-scale deployments. Because it is self-hosted or hosted in a private cloud, it is well-suited for industries with stringent compliance requirements. The platform includes comprehensive features such as direct messages, group chats, and file sharing, along with plugins and integrations that provide a high degree of flexibility.
While the software is open-source and allows organizations to customize and extend the platform, exact pricing details are not provided in the source facts. Check their pricing page for current plans. Additionally, the platform currently lists Web as its available platform.
Features
Open Source
Mattermost is open-source, which allows organizations to customize and extend the platform to fit their specific needs. This also means that the community can contribute to the development and improvement of the software.
Security
Being self-hosted or hosted in a private cloud, Mattermost offers strong security controls, making it suitable for industries with stringent compliance requirements.
Flexibility
Mattermost supports a wide range of plugins and integrations with other tools and services, providing a high degree of flexibility in customization.
Team Collaboration
The platform provides comprehensive team collaboration features, including direct messages, group chats, and file sharing, which streamline communication and project management.
Scalability
Mattermost is designed to handle large-scale deployments, making it suitable for enterprises with significant user bases.
Screenshots

Mattermost vs. its alternatives
| Pricing | Open source | — | Open source | Open source | — |
| Platforms | |||||
| Listed features | 5 | 6 | 8 | 8 | 5 |
Frequently asked questions
How much does Mattermost cost?
Mattermost is tagged as open source, but exact pricing details are not listed in the provided facts. Check their pricing page at https://mattermost.com/pricing/ for current plans.
What is Mattermost used for?
Mattermost is used for team collaboration, providing direct messages, group chats, and file sharing to streamline communication and project management.
What platforms does Mattermost support?
Mattermost is available on the Web platform, and can be self-hosted or hosted in a private cloud.
Does Mattermost support security and compliance?
Yes, Mattermost offers strong security controls through its self-hosted or private cloud deployment model, making it suitable for industries with stringent compliance requirements.
Can I customize Mattermost?
Yes, as an open-source platform, Mattermost allows organizations to customize and extend the software, supported by a wide range of plugins and integrations with other tools and services.
What are the best alternatives to Mattermost?
Some known alternatives to Mattermost include Slack, Discord, and Zulip. You might prefer these depending on your specific needs for cloud hosting, community features, or pricing structures.
Alternatives to Mattermost
Read the full comparison →Slack
A messaging app for teams who see through the Earth!
Discord
Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Zulip
Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Flock
A faster way for your team to communicate
Element.io
Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Telegram
Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Wire
Private & Secure Messenger
Matrix.org
Matrix is an open standard for decentralized persistent communication over IP.