Mattermost vs Rocket.Chat (2026)
A side-by-side comparison of features, pricing, licensing, and self-hosting.
Mattermost vs Rocket.Chat
Short answer: choose Mattermost if your team is engineering-led and compliance-driven; choose Rocket.Chat if you need omnichannel customer communications alongside internal chat.
Mattermost is written in Go and built for DevOps and security-conscious organizations. Its headline differentiators are granular compliance controls — full audit logging, e-discovery export, SAML/LDAP sync, and data retention policies — and the built-in Playbooks feature for structured incident response. The MIT-licensed server is lean and ships as a single binary, which makes it easier to run at scale or in resource-constrained environments.
Rocket.Chat is built on Node.js and MongoDB (Meteor framework), which gives it more flexibility but higher baseline resource consumption. Its breadth is the draw: it ships omnichannel inbox support natively, letting teams route WhatsApp, Instagram, email, and live-chat conversations through the same interface as internal channels. For businesses that want to consolidate internal and customer-facing communications under one self-hosted roof, that capability is unique.
Both are MIT or MIT-compatible licensed, both self-host via Docker, and both offer paid enterprise tiers for SSO and advanced features. The practical split: Mattermost for airgapped enterprise or devops-primary teams; Rocket.Chat when customer-facing messaging breadth matters as much as internal collaboration.
Mattermost
Open-source, self-hosted team messaging built for security-conscious and DevOps teams.
Pros
- Full data sovereignty — runs on your own servers with no vendor access
- MIT-licensed core is free to self-host with no seat caps
- Built-in compliance, audit logging, and e-discovery features
Cons
- UI and mobile experience lag behind Slack's polish
- Enterprise features like SSO and advanced permissions require a paid license
Rocket.Chat
Open-source team chat and omnichannel customer messaging platform.
Pros
- MIT license with a large feature set available for free on self-hosted installs
- Omnichannel capabilities blend internal chat and external customer communications
- Active community and frequent release cadence
Cons
- JavaScript/Meteor stack can be resource-intensive compared to lighter alternatives
- Admin interface has a steep learning curve for smaller teams
Mattermost vs Rocket.Chat: spec comparison
| Spec | Mattermost | Rocket.Chat |
|---|---|---|
| License | MIT / Open-core | MIT |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Starting price | Free / self-host | Free / self-host |
| Pricing model | open-core | open-core |
| Language | Go | JavaScript |
| Platforms | web, ios, android, mac, windows, linux, self-hosted, docker | web, ios, android, mac, windows, linux, self-hosted, docker |
| Founded | 2015 | 2015 |
| GitHub stars | 32,000 | 42,000 |
FAQ
Mattermost vs Rocket.Chat: which is better?
Neither is universally better. Mattermost (Free / self-host) suits Security-conscious engineering teams, government contractors, and enterprises with strict data residency requirements.; Rocket.Chat (Free / self-host) suits Teams that need both internal collaboration and external customer messaging in a single self-hosted platform.. The spec table above breaks down the differences.
Is Mattermost or Rocket.Chat cheaper?
Both start at the same price (Free / self-host).