Mattermost vs Rocket.Chat pricing: which one fits your user count and compliance needs
If you are a regulated team leader with a short list of self-hosted Slack replacements and a fixed budget, the pricing question comes down to three things: how many users you have, whether you need high availability or air-gapped operation, and which compliance controls must be in place on day one. Mattermost sells Professional, Enterprise and Enterprise Advanced as prepaid annual subscriptions priced by seat license, and its pricing page lists no public prices. Rocket.Chat offers a free Starter plan for up to 50 users, with LDAP and Active Directory authentication, single sign-on and multi-factor authentication included, and quotes its Commercial, Government and Defense plans. Per the supplied plan details, SSO and AD/LDAP user sync start at Mattermost Professional and at Rocket.Chat Starter. High availability and FIPS 140-3 compliance start at Mattermost Enterprise, while air-gapped deployment is in Mattermost Enterprise Advanced and in Rocket.Chat's paid plans, not Starter.
Because the two vendors gate different features, a fair comparison starts with a feature list rather than a headline price. Write down the controls your auditors and security team will ask for, such as SAML group mapping, tamper-evident audit trails of messages, files and sessions, and automated failover, then check which plan includes each one in both vendors' current materials. Ask each vendor for a written quote that names the seat count, the plan, the support terms and whether the air-gapped or HA features are included. Confirm the seat definition in writing, including how inactive or guest accounts are counted, because that changes the total more than any list rate.
Self-hosting costs apply under either choice and are often larger than the license line. Your own staff or a services partner will operate the database (PostgreSQL for Mattermost, MongoDB as a replica set for Rocket.Chat), the file storage that Mattermost high availability requires on shared S3, S3-compatible or NAS storage, and the upgrades that both vendors' support windows demand. Mattermost publishes support end dates for each server version, and Rocket.Chat states that end-of-life versions lose security fixes and mobile client compatibility. Estimate those recurring operating hours, then ask both vendors what their subscription includes for upgrades and whether an implementation partner can take that work under a fixed-scope agreement.
How each platform charges, by feature need
This table maps each feature need to the plan that includes it on Mattermost and Rocket.Chat. Read it as a checklist: find the requirement your team must meet, then confirm which paid plan or free tier covers it before you request a quote.
| Need | Mattermost | Rocket.Chat |
|---|---|---|
| Pricing model | Prepaid annual subscriptions per seat license across Professional, Enterprise and Enterprise Advanced. No public prices; buyers contact sales. | Free Starter and Community tiers, plus Commercial, Government and Defense plans priced by quote. |
| Free tier | The MIT-licensed Team Edition is free, but SSO is not included. Confirm current Team Edition limits with Mattermost. | Starter allows up to 50 users with LDAP, AD, SSO, MFA, end-to-end encryption and retention. Community allows up to 100 concurrent users with core messaging. |
| SSO and directory sync | SSO (SAML, OIDC, OAuth) and AD/LDAP user sync start at the Professional plan. | SSO, LDAP and Active Directory are on the free Starter plan. LDAP and SAML group mapping is listed on paid plans. |
| High availability | Clustering is available only on Enterprise and Enterprise Advanced. It requires shared S3, S3-compatible or NAS file storage on every node. | Built-in redundancy with automated failover is a paid-plan item. Reference architectures require a paid plan for multi-instance and microservice designs. |
| Audit trails | Compliance exports are tied to the paid tiers. Confirm which export and retention features each plan includes. | Tamper-evident audit trails of messages, files and sessions are listed on paid plans, not on Starter. |
| Air-gapped deployment | Included in Enterprise Advanced only. Confirm offline licensing and update steps with Mattermost before purchase. | A paid-plan capability, not available on Starter. Confirm offline registration and license terms on the quote. |
| FIPS 140-3 compliance | Included from Enterprise. Confirm the validated build and scope with Mattermost. | Not listed in the supplied facts. Confirm with Rocket.Chat whether any government plan provides it. |
| Support and release windows | Monthly server releases; v11.7 is an ESR supported until 2027-05-15. v11.11 supports until 2026-12-15. | Standard releases supported for 6 months and LTS for 12 months. Unsupported versions lose security fixes and may lose mobile and desktop client connectivity. |
| What requires a quote | All paid plan prices and seat counts, plus any HA or air-gapped support terms. | All Commercial, Government and Defense plan prices, plus multi-instance or Kubernetes deployments. |
What moves the total cost of each option
Licence fees are only one line in the total. Seat count, the availability and air-gap needs of your environment, the compliance evidence you must produce, and the team that runs the database and upgrades all change what you pay. The cards below name the condition under which each driver matters, so you can ask both vendors for the right quote.
Seat count against the Starter limit
Rocket.Chat's free Starter plan allows up to 50 users, while the free Community workspace allows up to 100 concurrent users with core messaging. Mattermost's paid plans are prepaid annual subscriptions priced per seat license, and the pricing page lists no public figures. Below the free limits, the question is which features you need. Above them, ask each vendor to quote the same user count, concurrency and growth assumptions in writing.
High availability as a paid feature
Mattermost high availability, covering redundant application servers, database servers and load balancers, is available only on Enterprise and Enterprise Advanced. Rocket.Chat's built-in redundancy with automated failover sits in its paid plans, and its multi-instance and microservice reference designs also require a paid plan. If you need failover, the subscription tier is part of the cost. Confirm which tier includes each component you plan to run.
Air-gapped operation and offline licensing
Mattermost places air-gapped deployment in Enterprise Advanced, while Rocket.Chat treats it as a paid-plan capability unavailable on Starter. For networks with no internet access, the licence model, offline registration and update path all add cost and effort. Ask each vendor how licence validation, updates and push notifications behave without outbound connections, and whether the FOSS build route changes your support position.
Audit trails and compliance exports
Rocket.Chat's paid plans list tamper-evident audit trails covering messages, files and sessions. Mattermost's pricing page places SSO, AD/LDAP sync and FIPS 140-3 compliance across its plans, so you should map each control your auditor expects to a specific tier. Compliance readiness is not the same as a certification, so ask each vendor which evidence it exports and who in your team will retain it.
Database operating effort
Mattermost runs on PostgreSQL, with read replicas and search replicas for scaling. Rocket.Chat 8.x requires MongoDB 8.0 or later as a replica set, and a three-member replica set is strongly recommended for high availability. Your existing skills and backup tooling decide which database adds less recurring effort. For highly available designs, Mattermost also needs shared file storage on S3, an S3-compatible service or NAS on every node, which adds infrastructure cost.
Upgrade cadence and support windows
Mattermost publishes server versions monthly, and its ESR line has a longer support window, with v11.7 supported until 2027-05-15. Rocket.Chat standard releases get 6 months of support and LTS releases 12 months. After end of life, Rocket.Chat versions lose security fixes and some cloud services, and may stop connecting to official mobile and desktop clients. Budget staff time for regular upgrades on whichever line you choose, and confirm the support window in each quote.
The self-hosting costs that apply whichever vendor you pick
The license fee is only one line in the budget, and several self-hosting costs arrive whichever vendor you pick. Your organization pays its cloud account, data center or hardware bill for application servers, a PostgreSQL database for Mattermost or a MongoDB replica set for Rocket.Chat, backups, monitoring and load balancers. Those charges recur monthly or yearly, and they grow with concurrent users and message retention. Ask each vendor, and your infrastructure team, to size the same user count and retention period so the comparison uses one set of numbers.
Mattermost high availability adds a storage decision that often gets missed in early estimates. Its docs require shared file storage on Amazon S3, an S3-compatible service or a NAS mounted on each node, and warn that local file system storage will not work correctly and risks corrupting files. Whoever runs the platform owns that storage bill and its backup policy. On the Rocket.Chat side, version 8.x requires MongoDB 8.0 or later as a replica set, and its requirements recommend three members for high availability, so you pay for three database nodes, their disks and their patching. Node.js is bundled in the official Docker image and Helm chart, which removes one runtime to install, but you still pay for the container host that runs it. Confirm which of these components your chosen architecture needs before you accept any quote.
The largest recurring cost is staff time, and it does not depend on the license. Both platforms ship on regular schedules: Mattermost publishes server builds monthly and its extended support releases carry a fixed end date, while Rocket.Chat's standard releases are supported for 6 months and LTS releases for 12 months. After end of life, Rocket.Chat says unsupported versions can lose the ability to connect with the official mobile and desktop clients, so an upgrade you skip becomes a user-facing outage. Budget named staff hours for monthly or quarterly upgrades, test runs in a staging copy, and backup restores. Ask any implementation partner for a fixed-scope upgrade and retainer quote that states what is covered, and confirm the support window for the version you plan to run in the Mattermost server releases page.
How to confirm pricing fit in your own environment
This sequence turns a list of users, must-have features and infrastructure limits into written quotes from both vendors, so you compare the same scope on the same terms before you commit to either platform.
Count named and concurrent users
Start by counting the people who need a named account, then estimate how many will be online at the same time during a typical working hour. Mattermost sells seat licenses, and Rocket.Chat's free Starter plan caps total users at 50 while its free Community workspace allows up to 100 concurrent users, so both counts decide which tier you even consider. Include contractors, guests and bot or integration accounts in the tally, since your quote request will need a firm seat number. The output is a single written figure for named users and a separate figure for peak concurrency, agreed by the IT lead and the business sponsor.
List must-have features and compliance needs
Write down each requirement your security and compliance teams will test, such as single sign-on through SAML or OIDC, Active Directory or LDAP sync, high availability, tamper-evident audit records, FIPS 140-3 compliance and air-gapped operation. Mark each item as mandatory or preferred and name the owner who will sign off on it. Requirements phrased as outcomes, such as "administrators can export message audit records for a regulator", are easier to check against vendor documentation than product names alone. The output is a signed requirements list that becomes the basis for every quote you request.
Map each requirement to the plan that includes it
Take the requirements list and check each item against the current pricing pages for Mattermost and Rocket.Chat, noting which plan includes it. Per the vendor pages, Mattermost places SSO and AD/LDAP sync from Professional, high availability and FIPS 140-3 from Enterprise, and air-gapped deployment in Enterprise Advanced, while Rocket.Chat lists SSO, LDAP and MFA on Starter but places audit trails, built-in failover and air-gapped deployment in its paid plans. Confirm each mapping in writing with the vendor, because plan contents change between releases. The output is a matrix with one row per requirement and one column per vendor, showing the lowest plan that meets it.
Size the infrastructure against the system requirements
Your platform team checks each vendor's system requirements against your hosting plan, including the database, file storage and the number of application nodes. Mattermost high availability needs redundant application servers, database servers and load balancers, plus shared file storage such as S3, an S3-compatible service or NAS on every node. Rocket.Chat 8.x requires MongoDB 8.0 or later as a replica set, and its reference architectures change from a single instance to load-balanced instances and then Kubernetes as concurrency grows, with the multi-instance and microservice designs requiring a paid plan. Record the servers, storage, database licenses or support contracts you must buy, since these costs apply whichever vendor you choose. The output is a sized architecture diagram and a bill of materials for your own environment.
Request written quotes with stated terms
Send the same written scope to Mattermost and Rocket.Chat, listing the seat count, peak concurrency, required plan features, deployment model, support level and the start and end dates of the subscription term. Both vendors price by quote, so ask each to show the annual subscription fee, any uplift on renewal, the treatment of seats added during the term and the cost of support or onboarding services. Ask whether the quote includes separately licensed components, such as enterprise code for Rocket.Chat or the air-gapped package for Mattermost, and what happens to the subscription if you reduce seats. The output is two comparable written quotes that state their assumptions in the same terms.
Run a pilot import to estimate conversion effort
Export a representative sample from your current chat tool, which may be Slack, and test the import into a non-production instance of each candidate. Rocket.Chat's import tools accept full Slack workspace exports, Slack users from CSV and a CSV importer for other sources, while Mattermost migrates data from Slack through its own documented process, so the conversion steps differ by vendor. Record which channels, users, files and custom integrations convert cleanly, which need manual work and which fail. Time the pilot by hand and use the results to estimate the services hours your implementation partner will need, then ask for those hours in the written scope. The output is a conversion report that shows the effort each path requires for your data, not a generic estimate.
Confirm recurring and one-time costs in one model
Combine the quotes, infrastructure bill of materials and pilot findings into a single cost model with separate lines for one-time work and recurring spend. One-time items include migration, configuration, integration with identity and monitoring, and testing; recurring items include subscription fees, hosting, storage, database and backup, upgrades and support. Note the upgrade cadence each vendor requires, because unsupported Rocket.Chat versions lose connectivity with the official mobile and desktop clients, and Mattermost ships a new server version each month with extended support releases. Have finance and the security lead review the model together. The output is a three-year cost view for each vendor that every stakeholder has reviewed and accepted.
Questions buyers ask before pricing a self-hosted chat rollout
Is Rocket.Chat Starter enough for SSO?
Starter includes single sign-on, LDAP and Active Directory authentication and multi-factor authentication, and it allows up to 50 users. That covers many small teams that need SSO without a subscription. Confirm two things before you rely on it: the user count you expect to reach, and whether you need the paid-plan features that Starter does not include, such as LDAP and SAML user group mapping, tamper-evident audit trails and built-in redundancy with automated failover. Those appear in the paid tier listing, so check them against the Rocket.Chat plans documentation for your version.
Does Mattermost high availability require a paid plan?
Yes. Mattermost high availability, which means redundant application servers, redundant database servers and redundant load balancers, is available only on the Enterprise and Enterprise Advanced plans. The Professional plan includes SSO and AD/LDAP user sync but not clustering. A cluster also needs shared file storage on Amazon S3, an S3-compatible service or a NAS mounted on each node, because local file system storage will not work correctly and risks corrupting files. Budget for that storage and its operation in addition to the subscription.
What does a Mattermost or Rocket.Chat quote depend on?
Both vendors price by quote, and neither publishes a public price list for its paid tiers. Mattermost sells prepaid annual subscriptions based on seat licenses, so the seat count, plan level and contract term drive the figure. Rocket.Chat prices its Commercial, Government and Defense plans by quote. Ask each vendor to itemize the plan, the user count, the features you require (SSO, high availability, audit, air-gapped operation), the support level and the renewal terms. Also ask whether the quote covers only the license or any implementation help.
What does the work need from our own team?
Whichever platform you pick, your team owns the infrastructure, the database, file storage, backups, certificates and identity configuration unless you hand those tasks to a partner. Rocket.Chat 8.x requires MongoDB 8.0 or later running as a replica set, and a three-member replica set is strongly recommended for high availability. Mattermost runs as a single Linux binary on PostgreSQL. Your team also needs a plan for regular upgrades, because Rocket.Chat versions reach end of life after 6 months (standard) or 12 months (LTS), and unsupported versions lose security fixes and may lose mobile and desktop client compatibility.
Can we install and upgrade both platforms ourselves?
Often yes, provided your team has the skills for the database, reverse proxy, storage and identity layers that each platform depends on. Mattermost publishes server binaries on the 16th of each month, and its current extended support release is v11.7, supported until 2027-05-15. Rocket.Chat publishes standard and LTS lines with the support windows noted above. For a regulated environment, confirm whether your team can test each upgrade in a staging copy and roll back. If that capacity is missing, a fixed-scope engagement from DeployOpen can cover planning, implementation, documentation and upgrade support, with ongoing support available as a retainer.
How long does a migration or pilot take?
No supplied figure gives a duration, so treat any number you hear as a question to verify. The main drivers are the size of the export, the number of channels and files, how many identity sources must be mapped, and whether you need a high availability cluster from the start. Rocket.Chat's import tools accept full Slack workspace exports, Slack users from CSV and a CSV importer for other sources, and Mattermost data reaches Rocket.Chat by converting its export to CSV. Ask the vendor or partner for a written plan with a pilot scope, acceptance criteria and a cutover date before you commit.
What should a quote from DeployOpen cover?
DeployOpen plans, implements, customizes, integrates, hardens, backs up, upgrades, documents and supports self-hosted open-source platforms inside your own cloud accounts, data centers or air-gapped networks. Most engagements are fixed-scope, with scope, deliverables and timelines agreed in writing before work starts. DeployOpen does not publish a price list, so a quote follows from that written scope. Ask for the deliverables, the identity and storage integrations included, the testing and handover steps, and whether ongoing support is a separate retainer. DeployOpen does not issue audit reports or certifications.
What to ask for in a written quote
A written quote for either platform should itemize licensed seats and how they grow, because both vendors price on users and the difference shows up in the count. Mattermost sells Professional, Enterprise and Enterprise Advanced as prepaid annual subscriptions based on seat licenses, and its pricing page lists no public prices, so ask for the seat count, the billing period, and the rule for adding seats mid-term. For Rocket.Chat, confirm which user limit applies to your scenario, since the free Starter plan covers up to 50 users and the free Community workspace covers up to 100 concurrent users, while paid plans are priced by quote. Ask each vendor to name the plan that unlocks every feature you need, such as SSO, LDAP or Active Directory group mapping, high availability, audit trails and air-gapped deployment, and to confirm that feature in writing rather than inferring it from a plan name.
Next, ask for the renewal and true-up terms in writing: the renewal date, the notice period, whether unused seats can be reduced at renewal, and how overage is billed if active users exceed the licensed count. Also ask which major and LTS release lines the subscription covers, because Rocket.Chat standard releases are supported for 6 months and LTS releases for 12 months, and Mattermost publishes its own support end dates for each version. Support tier belongs on the same line as the license, with response expectations and channels stated, and with a clear note of what happens to support if you run an unsupported version. Confirm the vendor's position on upgrades inside the subscription, since both platforms require regular upgrades to stay supported. The quote should also separate what the vendor provides from what you provide. Infrastructure is a recurring cost either way: the database (PostgreSQL for Mattermost, MongoDB as a replica set for Rocket.Chat), shared file storage for a Mattermost high availability cluster, load balancers, backups, and any push or mobile gateway dependencies. Ask whether the vendor's subscription covers any of these, and whether they are yours to size. Finally, request a fixed implementation scope that lists migration from Slack, user directory integration, testing, and handover documentation. DeployOpen does not publish prices and works from a written fixed scope, and a quote follows from that scope, so the more precisely you define the scope, the more useful the quote will be.
How DeployOpen helps you evaluate and implement the right tier
DeployOpen plans, implements and supports self-hosted open-source platforms inside your own cloud accounts, data centers or air-gapped networks, so the tier decision is tested against your real environment before any license is bought. We work from a written scope, so the plan, deliverables and timeline are agreed before work starts.
How we scope
- Map your required features, such as SSO, high availability, audit trails and air-gapped operation, to the plan that actually includes them.
- Count named users and concurrent users, since seat counts and Starter limits drive which subscription fits.
- Agree in writing which vendor quotes you need, and who requests and holds them, before any build starts.
How we build
- Stand up a proof-of-concept on the chosen edition inside your own infrastructure to test SSO and directory sync.
- Size the database, file storage and replica layout each option requires, including shared storage for Mattermost high availability.
- Test the same migration path from your current chat tool, including export conversion, on a copy of real channel data.
How we hand over
- Deliver the written tier decision with the cost components, recurring items and questions to put to each vendor.
- Document the deployment, upgrade cadence and version support windows so your team can run the platform.
- Provide evidence and configuration records that your internal or external auditors can review during compliance readiness work.
How we support
- Offer ongoing support, upgrades and continuous testing as a retainer after handover, scoped in writing.
- Plan upgrades around each vendor's release and support windows so the platform stays on a supported version.
- Revisit the tier decision when user counts, compliance requirements or air-gapped needs change.
