Meetrix packages both of these as AWS AMIs, so neither side of this comparison is a stranger to us, and neither gets a pass. Rocket.Chat vs Mattermost comes down to one real question once you strip out the marketing: do you need customer-facing omnichannel support routed into the same inbox as your team chat, or do you just need internal team chat? Rocket.Chat does both. Mattermost does the second one and does it well, but has no answer for the first.
Quick answer
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Rocket.Chat: team chat plus customer-facing omnichannel
Rocket.Chat's Community edition is MIT licensed and free to self-host with no per-seat fee, though Rocket.Chat documents it for basic use with up to 100 concurrent users and 10,000 push notifications a month. What sets it apart from a plain team chat tool is Omnichannel: WhatsApp, SMS, email, and web live chat conversations all route into the same agent inbox your internal team already uses. As of April 2026, Rocket.Chat retired its mid-tier Pro plan; the lineup now runs from the free self-hosted Community edition straight to custom-quoted Enterprise plans (Commercial, Government, Defense variants), with no published self-serve price in between.
Key facts
- MIT licensed with no per-seat fee, documented for up to 100 concurrent users on the self-hosted Community edition
- Omnichannel routing: WhatsApp, SMS, email, and live chat into one inbox
- Built-in video conferencing, two-factor authentication, and file sharing
- Enterprise adds HA clustering, audit logging, DLP, and AI features, custom quoted
Mattermost: internal team chat, nothing else bolted on
Mattermost's Team Edition is also MIT licensed, free to self-host for deployments under 250 users where single sign-on isn't required. It's built specifically around the software development lifecycle: channels, threads, voice calls, and integrations aimed at engineering and DevOps teams. There's no customer-facing channel layer here at all, Mattermost assumes the people in the workspace are your own employees, not external contacts routed in from WhatsApp or SMS. Our Mattermost on AWS guide covers what a server costs and how to lock it down.
Key facts
- MIT licensed Team Edition, free for deployments under 250 users, no SSO required
- Built-in voice calls, threaded discussions, and SDLC-focused integrations
- Professional and Enterprise are prepaid annual licenses, priced by sales quote; Professional supports up to 250 users
- Enterprise scales to 50,000 concurrent users, 200,000 on Enterprise Advanced
Rocket.Chat vs Mattermost: omnichannel vs internal-only
This is the one criterion that actually decides most evaluations, everything else is closer than either vendor's marketing suggests. Rocket.Chat's Omnichannel module centralizes WhatsApp, SMS, email, and web live chat into a single agent view, with routing rules, business hours, and canned responses built in. It's a genuine customer-support surface, not a chat widget bolted onto a team tool. Rocket.Chat's Omnichannel documentation lists the channels and routing options.
Mattermost has nothing comparable, and it's not an oversight, it's a scope decision. Mattermost is built for people already on your payroll talking to each other, with integrations that assume a software team's workflow: Jira, GitLab, PagerDuty, CI/CD pipelines. If your actual need is routing customer WhatsApp messages to a support queue, Mattermost vs RocketChat isn't a close call, Rocket.Chat is the only one of the two that does it.
Cost
Both start at the same number: zero. Rocket.Chat's Community edition and Mattermost's Team Edition are each MIT licensed with no per-seat fee at self-hosted deployment, you pay for the server, nothing else. Past that, neither publishes a price any more. Mattermost's pricing page now says Contact Sales for Professional, which supports up to 250 users, and you'll still see an old $10 per user per month figure repeated in comparisons that haven't been updated. Rocket.Chat retired its $8 Pro plan in April 2026, so anything beyond Starter (free up to 50 users) and Community now means a custom quote for its Commercial, Government or Defense plans.
So both have the same shape today: free, then a sales call. If you're comparing paid tiers, ask both vendors for the same seat count, SSO, high availability and support terms, and compare the quotes side by side. Our Rocket.Chat vs Mattermost hosting and pricing comparison goes through what to ask and what the servers cost each month.
Setup and the underlying stack
Rocket.Chat runs on Node.js with MongoDB as the database. Mattermost runs on a Go server backed by PostgreSQL or MySQL. Both are standard Docker Compose deployments for a small team, running in under an hour on either one. The difference shows up later: MongoDB replica sets for high availability are a different operational skill than PostgreSQL streaming replication (and if you'd rather pay someone else to run Rocket.Chat's database, see what MongoDB Atlas costs compared with self-hosting it), and if your team already runs one database engine in production, that existing expertise leans you toward whichever tool matches it.
Support and reliability
Neither vendor publishes a response-time SLA for their free self-hosted edition, that's standard for open source software; community forums are the support channel until you pay for something more. Mattermost's paid Enterprise tier commits to 24/7 support with a four-hour response time, plus an optional Premier Support add-on. Rocket.Chat's Enterprise plans include premium support as part of the custom-quoted package, but without a published response-time number to compare directly against Mattermost's four-hour commitment.
Scale
Mattermost publishes hard numbers: Enterprise scales to 50,000 concurrent users, and a newer Enterprise Advanced tier (aimed at defense and critical infrastructure customers) scales to 200,000. Rocket.Chat doesn't publish an equivalent concurrent-user ceiling for self-hosted Enterprise deployments; its scale story leans more on Omnichannel throughput (agent seats, contact volume) than raw concurrent chat users, which makes a direct number-for-number comparison hard to state honestly.
Rocket.Chat vs Mattermost: the facts
| Criterion | Rocket.Chat | Mattermost |
|---|---|---|
| License (free tier) | MIT (Community) | MIT (Team Edition) |
| Limits on free tiers | Starter: up to 50 users. Community: documented for 100 concurrent users | Team Edition: under 250 users, no SSO |
| Omnichannel (WhatsApp/SMS/live chat) | Yes, built in | Not available |
| Self-serve paid tier | None published (Pro retired April 2026) | None published (Professional is quote-based) |
| Enterprise pricing | Custom quote only | Custom quote only |
| Underlying database | MongoDB | PostgreSQL or MySQL |
| Published concurrent-user ceiling | Not published | 50,000 (Enterprise), 200,000 (Enterprise Advanced) |
| Built-in video calls | Yes | Yes |
| SDLC-focused integrations | Available, less central to the product | Core focus of the product |
Looking for a Mattermost alternative?
Most people searching for a Mattermost alternative have hit one of three walls: SSO needing a paid license, no way to talk to customers, or the developer-heavy feel putting off the rest of the company. Which wall decides the alternative.
- Need customer channels: Rocket.Chat, for the omnichannel reasons above.
- Want calmer, threaded conversations: Zulip, where every message lives in a topic. We cover running it in Zulip as a self-hosted Slack alternative.
- Need to talk to other organisations: Matrix, below.
- Don't actually need self-hosting: Slack. We compared the two directly in Mattermost vs Slack.
Looking for a Rocket.Chat alternative?
The usual reasons to leave Rocket.Chat are running MongoDB, the Pro plan disappearing in 2026, or simply never using Omnichannel. If it's the last one, Mattermost is the obvious move: same MIT-licensed, self-hosted model, a Postgres backend, and a product that only does internal chat. If you were using Omnichannel, there isn't a like-for-like open source swap; you'd pair a team chat tool with a separate helpdesk instead.
Rocket.Chat vs Mattermost vs Matrix
Matrix keeps coming up in this comparison, and it's a different kind of thing. Rocket.Chat and Mattermost are products. Matrix is an open protocol: you run a homeserver (usually Synapse), people use a client (usually Element), and your server can federate with every other Matrix server, the way email does. Private chats are end-to-end encrypted by default.
That makes Matrix the right pick when you need to chat across organisations, or when encryption you control matters more than polish. It's the wrong pick if you want one tidy product with admin screens for everything. We walk through the server side in self-hosting Matrix Synapse.
Switching between them
Both store their data in an open, documented database rather than a proprietary format, so nothing is technically locked away from you the way SaaS export limits can lock away Slack history. But there's no official Rocket.Chat-to-Mattermost import tool, or the reverse. Moving between them means writing your own export script against whichever database you're leaving, and mapping channels, users, and message history into the other tool's schema yourself. It's a real project, not a checkbox.
Where each one falls short
Rocket.Chat
- No published self-serve tier between free Community and custom-quoted Enterprise, since April 2026
- MongoDB replica set operations are a different skill set than most teams already running Postgres have
- No published concurrent-user ceiling makes scale planning harder to pin down in advance
- The Omnichannel feature set that justifies picking it over Mattermost goes unused if you never needed customer-facing channels in the first place
Mattermost
- No omnichannel layer at all, if customer support routing becomes a requirement later, it's not an upgrade path, it's a different tool
- SSO requires a paid tier even for teams that would otherwise stay on the free edition
- Professional supports up to 250 users and is quote-only, so past the free edition every step is a sales conversation
- Its integration ecosystem leans hard toward software teams; less natural fit for non-technical departments
Rocket.Chat vs Mattermost isn't a question of which is better built, both are mature, MIT licensed, and genuinely free to self-host for small and mid-sized teams. It comes down to whether Omnichannel is a feature you'll use or a feature you'll pay operational complexity for and never touch. Pick Rocket.Chat if customer-facing channels are part of the job. Pick Mattermost if they're not, and take the lighter Postgres-based stack instead.
If you'd rather add video meetings to Mattermost than switch tools, there's our Mattermost Jitsi plugin guide. Our Rocket.Chat developer guide and Rocket.Chat AWS setup guide cover the self-hosted install end to end, including Omnichannel configuration. If Mattermost fits your use case better, our Mattermost deployment guide covers that path in the same depth.
Frequently Asked Questions
Rocket.Chat vs Mattermost: which is the better self hosted Slack alternative?
Rocket.Chat if you need customer channels (WhatsApp, SMS, live chat) next to internal chat. Mattermost for internal chat with deeper developer integrations. Both are MIT licensed and free to self-host within limits: 100 concurrent users on Rocket.Chat Community, under 250 users without SSO on Mattermost Team Edition.
Mattermost vs RocketChat: which has more features for free?
Rocket.Chat. Its free Community edition includes omnichannel routing across WhatsApp, SMS and web chat alongside internal messaging, documented for up to 100 concurrent users. Mattermost's free Team Edition is internal team chat only, with no omnichannel layer at all.
Does Mattermost have omnichannel customer support like Rocket.Chat?
No. Mattermost is built for internal team chat, not customer-facing channels. If you need to route WhatsApp, SMS, or live chat conversations into the same inbox your team uses, Rocket.Chat is the only one of the two built for that.
Which is easier to run, Rocket.Chat or Mattermost?
Mattermost's stack (Go server, PostgreSQL or MySQL) is generally considered lighter to operate than Rocket.Chat's Node.js and MongoDB stack, particularly MongoDB replica set management once you're past a single-node setup. Neither is hard to run for a team that already manages a database in production.
What is the best Mattermost alternative?
Rocket.Chat, if you also need customer channels like WhatsApp or live chat. Zulip, if your team lives in threaded conversations. Matrix with Element, if you need federation between organisations. Slack, if self-hosting was never the point. Each one is free to self-host in some form.
Rocket.Chat vs Mattermost vs Matrix: which should I choose?
Rocket.Chat and Mattermost are complete products you install and run. Matrix is an open protocol: you run a homeserver such as Synapse plus a client such as Element, and your users can talk to people on other Matrix servers. Pick Matrix when federation or end-to-end encryption matters most.
Can I migrate from Rocket.Chat to Mattermost, or the other way around?
There's no official first-party import tool between the two. Both store messages in a documented, open database schema, so migration is technically possible with a custom export script, but it's a build-it-yourself project, not a supported feature on either side.
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