Mattermost vs Rocket.Chat: Feature Comparison for Team Chat

Mattermost vs Rocket.Chat: Core Differences

Both run on-premises. Neither locks you in. Data import/export is supported.

Why DevOps Teams Choose Mattermost

Mattermost was built by engineers, for engineers.

Native integrations with your workflow tools:

• GitHub and GitLab: Automated PR notifications, code review alerts, merge updates
• Jira: Create issues, see sprint updates, link tickets to discussions
• Jenkins: CI/CD pipeline notifications, build failures, deployment alerts
• Custom slash commands: Write your own workflows or use community scripts
• Webhook APIs: Any HTTP-triggered event feeds directly into Mattermost

Rocket.Chat offers integrations too, but they're broader and less specialized. If you live in GitHub and Jira every day, Mattermost cuts context-switching.

Example workflow: A developer merges code. GitHub triggers a Mattermost notification in #deploys. A teammate clicks a button in Mattermost to create a Jira task. Both actions stay in one place. That's the experience Mattermost targets.

Compliance & Regulated Industries

Mattermost holds more certifications relevant to government and healthcare buyers.

Mattermost certifications:

• FedRAMP (Federal Risk and Authorization Management Program)
• HIPAA (healthcare industry standard)
• SOC 2 Type II
• FIPS 140-3 (cryptography)
• Air-gapped deployment support
• DISA STIG-hardened images available

Rocket.Chat certifications:

• ISO 27001
• SOC 2 Type II
• DoD ATO IL6 (Defense Department Authorization)
• HIPAA support (via Business Associate Agreement)
• FINRA, MiFID II, NIS2, DORA ready
• Classified network support (NIPR, SIPR, JWICS)

Mattermost dominates federal and healthcare buying. Rocket.Chat excels with defense and financial services. If you're in healthcare or need FedRAMP, Mattermost has the advantage.

Resource Footprint & Cost

Mattermost runs lean. Rocket.Chat requires more capacity.

Mattermost: Baseline 1vCPU + 2GB RAM handles up to 1,000 concurrent users. Written in Go. Single binary. Only requires PostgreSQL. Infrastructure costs stay low as you scale to hundreds or thousands of users.

Rocket.Chat: Node.js + MongoDB stack. Higher memory footprint out of the box. Scales well if provisioned properly, but baseline costs are higher. Better if you already run large MongoDB fleets.

For small teams and cost-conscious deployments, Mattermost wins on infrastructure spend. For organizations already running MongoDB at scale, Rocket.Chat fits the existing stack.

Self-hosted cost: Zero software licensing. You pay only for infrastructure (server, storage, bandwidth).

Managed hosting cost: Mattermost managed instances start around 9-11/month for small teams. Rocket.Chat Pro is 8 per user per month (billed annually). For a 10-person team: Mattermost around 90-110/month vs Rocket.Chat around 960/year (~80/month). Mattermost is cheaper at small scale.

Mattermost for Internal Collaboration. Rocket.Chat for Omnichannel.

The two platforms diverged into different buyer personas.

Choose Mattermost if:

• Your team is technical (engineers, DevOps, SRE, security)
• You need deep GitHub/GitLab/Jira integrations
• You operate in regulated industries (healthcare, government, finance) and require FedRAMP or HIPAA
• You want to minimize infrastructure costs
• You prefer a familiar Slack-like interface with simple defaults

Choose Rocket.Chat if:

• You need omnichannel (live chat widget, WhatsApp, SMS, Instagram, email)
• You support external customers, not just internal teams
• You operate a large MongoDB infrastructure and want to leverage it
• You need DoD ATO or support for classified networks
• You prioritize customization and feature density over simplicity

Both are fully open source and portable. Neither locks you in. Switching between them is feasible but requires planning: data export, user migration, and re-setup of integrations.