Mattermost
An open source platform for secure collaboration across the entire software development lifecycle.
TypeScript · 36.2k GitHub stars
Mattermost vs Rocket.Chat
Side-by-side open-source comparison for 2026. Rocket.Chat currently leads on GitHub stars (42.2k) over Mattermost (36.2k). Both tools list each other as alternatives in this directory.
Quick comparison
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Rocket.Chat Rocket.Chat is a versatile open-source communication platform that prioritizes data protection and offers team collaboration, file sharing, and seamless integrations. | 42.2k | TypeScript | Other |
| 2 | Mattermost An open source platform for secure collaboration across the entire software development lifecycle. | 36.2k | TypeScript | Other |
Overview
Rocket.Chat
Rocket.Chat is a versatile open-source communication platform that prioritizes data protection and offers team collaboration, file sharing, and seamless integrations.
TypeScript · 42.2k GitHub stars
Explore both tools
42.2k
Rocket.Chat
Rocket.Chat is a versatile open-source communication platform that prioritizes data protection and offers team collaboration, file sharing, and seamless integrations.
⚡
Productivity🛠️
Tools🏠
Self-Hosted
36.2k
Mattermost
An open source platform for secure collaboration across the entire software development lifecycle.
⚡
Productivity🛠️
Tools⚙️
DevOps🔒
Security
Frequently asked questions
Which is more popular, Mattermost or Rocket.Chat?
Rocket.Chat currently has more GitHub stars (42.2k) than Mattermost (36.2k). Star counts are a proxy for community adoption.
Are Mattermost and Rocket.Chat free?
Yes. Both are open source and free to use in your own projects.
How does this comparison work?
Pages only exist for mutual alternatives — each tool lists the other in its alternatives metadata. Stats come from the canonical tool records in this directory.
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