Mattermost vs Rocket.Chat

Mattermost — strengths

• Go backend scales well and is resource-efficient for large deployments
• Strong fit for engineering/DevOps — Playbooks for incident response, Boards, and ChatOps integrations
• Self-host-first with a serious on-prem and compliance focus (air-gapped installs are common)
• Clean Slack import and a familiar Slack-like UX
• Active plugin ecosystem with slash-command and webhook integrations

Mattermost — weaknesses

• Key enterprise features (SSO groups, compliance, HA) behind paid tiers
• Built-in calling weaker than a dedicated conferencing tool
• No customer-facing / omnichannel support use case

Rocket.Chat — strengths

• Broad feature set beyond internal chat — omnichannel livechat across web, WhatsApp, email, and social
• Built-in and integrated voice/video options, including Jitsi
• Optional end-to-end encryption on a per-channel basis
• Highly customizable and integration-rich, with a large marketplace
• Flexible for both internal teams and external/customer communication

Rocket.Chat — weaknesses

• Heavier Node.js/MongoDB stack; scaling needs care
• Feature breadth increases administrative complexity
• Self-hosted push notifications can require extra configuration

When Mattermost fits

• Engineering org that wants Slack-like chat on-prem for compliance or air-gapped reasons, plus incident-response Playbooks: Mattermost is purpose-built for exactly this.
• Team leaving Slack that wants ChatOps — deploy bots, CI notifications, alerting — on an efficient Go backend: Mattermost's integrations and small footprint fit well.

When Rocket.Chat fits

• Company that wants one platform for both internal team chat and customer-facing livechat across WhatsApp, email, and web: Rocket.Chat's omnichannel is designed for that combination.
• Team that wants optional end-to-end encrypted channels for sensitive discussions: Rocket.Chat offers per-channel E2E that Mattermost's model doesn't target.

Mattermost gotchas

• Many advanced features (SAML/LDAP groups, compliance exports, some Playbook features) are gated behind paid Enterprise
• The free edition's calling and video are more limited than a dedicated conferencing tool
• Board/Playbook packaging has shifted across releases — check what's in the free tier for your version
• Scaling to thousands of users benefits from HA/clustering, which is an Enterprise feature

Rocket.Chat gotchas

• The Meteor/Node.js backend is heavier and historically needs tuning (and a compatible MongoDB) at scale
• Licensing tiers have shifted; confirm which features are in the free Community tier for your use case
• The breadth of features makes setup and administration busier than a chat-only tool
• Self-hosted mobile push may route through Rocket.Chat's gateway unless you configure your own

Choose Mattermost when

Pick Mattermost if you're an engineering/DevOps org that wants an efficient, Slack-like, self-hosted chat with Playbooks and ChatOps, a strong on-prem/compliance posture, and a scalable Go backend.

Choose Rocket.Chat when

Pick Rocket.Chat if you need more than internal chat — omnichannel customer livechat, per-channel E2E encryption, and integrated voice/video — in one highly customizable platform.

Migration

Both support importing from Slack and, in various forms, from each other via export/import tooling, but expect an imperfect transfer of history, threads, and integrations. The reliable path is to export users, channels, and messages from the source (Slack-format import is the most robust route), stand up the target, import, then rebuild bots, webhooks, and SSO from scratch. Integrations rarely migrate — plan to recreate slash commands, incoming webhooks, and app configs by hand. Run both in parallel for a short window so people can verify important channels imported correctly before you retire the old server.

Frequently asked questions

Which is better for a developer/engineering team?

Mattermost — its Go backend, Playbooks for incident response, Boards, and ChatOps integrations are aimed squarely at engineering and DevOps workflows.

Which is better for customer support?

Rocket.Chat — its omnichannel livechat connects web chat, WhatsApp, email, and social into agent inboxes, a use case Mattermost doesn't target.

Can I import my Slack workspace?

Yes, both offer Slack import. It brings over channels and messages reasonably well, but integrations, some threading, and app configs need to be rebuilt afterward.

Which scales better?

Mattermost's Go backend is generally more efficient, and its HA/clustering (an Enterprise feature) is proven at large scale. Rocket.Chat scales too, but its Meteor/MongoDB stack needs more tuning.

Are they really free to self-host?

Both have free self-hosted editions. Mattermost gates SSO groups, compliance, and HA behind paid Enterprise; Rocket.Chat similarly reserves some features for paid tiers — confirm specifics for your version.

Does either support voice and video calls?

Rocket.Chat has more built-in and integrated conferencing (including Jitsi) and is stronger here. Mattermost offers a Calls capability and integrations but is more chat-first.

What about end-to-end encryption?

Rocket.Chat offers optional per-channel E2E encryption. Mattermost focuses on transport security and compliance controls rather than per-channel E2E.