The Trusted Mattermost Alternative

Secure Communications?
It’s Probably Between 
Us and Them

A secure communications platform you deploy on-prem, air-gapped, or on a private cloud to reduce shadow IT and speed coordination - with Zero Trust controls - to move faster, lock down access, and keep your keys.

Encrypted, ephemeral by default. Classified chats that auto-expire.

Self-hosted LLMs. Powered by your data, with sources you can verify.

Clearance-aware access. ABAC/RBAC controls that adapt in real time.

Interoperate without lock-in. Work across platforms, and keep your sovereignty.

Truly extensible. Build and customize beyond plug-and-play.

Unified communications to boost productivity.

"Rocket.Chat met our communication needs - secure messaging, audio and video calls, and document sharing. It checked all the security and usability boxes for us."

Jenny Nilsson

IT Strategist at Elsäkerhetsverket

Empowering teams to connect freely and securely.

"We wanted to make daily work for our workers as seamless as possible and equip them with the tools they need without compromising on data security and privacy.”

Rene Jahnke

Solution Architect, the City of Cologne

Streamlining emergency response operations.

“Rocket.Chat’s message auditing capabilities have improved our record-keeping, helping us maximize FEMA funding, ensuring we recover up to 75% of costs.”

Anonymized source

Director of Emergency Management at the U.S. City

Defence-grade security controls for NATO nations

“We needed robust security and on-premise deployment. Rocket.Chat met all our expectations, and we will continue using it as the main communications platform for all our exercises.”

Dan Ungureanu

Exercise Director at CCDCOE

Secure Communications?
It’s Probably Between 
Us and Them

Book a demo

Deployed by secure organizations globally

What sets us apart

What makes
Rocket.Chat different

Zero-Knowledge E2EE

Messages are encrypted from origin to endpoint. Keys stay with intended recipients; keep sensitive chats off the record and off your servers in classified environments.

Adaptive Zero Trust Access Control

RBAC/ABAC by role, program, clearance, and more, with context-adapting permissions. Make attribute-driven security decisions through internal or external policy decision points (PDPs).

Federate without new silos

Native Matrix federation is built into the Rocket.Chat platform. Collaborate across agencies and allies without separate servers or vendor lock-in. XMPP compatible.

Sovereign AI you run

Host an LLM of your choice and securely enrich it with proprietary intel to get answers you can verify, control by clearance, and rely on during high-stakes operations.

Real apps, not fragile webhooks

Build custom workflows and integrations that evolve with your mission needs. Integrate seamlessly with the existing ecosystem. An encapsulated framework for durable integrations and upgrades that don’t break.

Enterprise IAM, your way

Advanced AD/LDAP sync, Keycloak/OAuth, and dynamic role mapping as orgs change.

After the video ends, the chat lives on

Pexip video session chats are automatically saved in Rocket.Chat—searchable, auditable, and easy to revisit when you need the full record.

Secure CommsOS™

for mission-critical operations

Unify collaboration in one place. Bring chat, voice, file sharing, and AI together in one sovereign, compliant platform—secure, streamlined, unified.

Deploy where you operate

Run your stack on-premises, air-gapped, or on a private cloud— fit to your existing infrastructure.

Maximize your Microsoft investment

Leverage native Microsoft integrations and enable secure cross-platform messaging between Rocket.Chat and MS Teams users to embed multi-platform collaboration into your workflow.

Trusted by mission-driven teams nationwide

Here’s what our customers and partners have to say

"The security and flexibility of Rocket.Chat to scale up and down for 4000+ participants during cyber defence exercises has been very important."
"At Deutsche Bahn, we chose Rocket.Chat over Mattermost. We chose Rocket.Chat because of the way they've always done open source."
"Unlike other platforms that isolate developer communities, Rocket.Chat makes it incredibly easy to collaborate with external partners."

Get started with your deployment

Launch Rocket.Chat your way—using Docker, Kubernetes, or Launchpad for custom setups, or deploy instantly on AWS and DigitalOcean with our Rapid Cloud options. If you prefer, we can even set you up with a POC environment, hosting on us! Flexibility and control, wherever you operate.

Key use cases

Title

Defense & Intelligence: Classified communications with E2EE, sovereign AI enriched with proprietary intel , air-gapped deployment for secure operations, and RBAC/ABAC controls for multi-level security clearances.

Government Agencies: Cross-agency collaboration via native Matrix federation, built for GDPR compliance, complete data sovereignty, and persistent audit trails for legal requirements.

Critical Infrastructure: Zero Trust architecture with dynamic access controls, on-premise deployment for operational security, and 24/7 mission-critical support.

Have questions? 

Here's what we often hear

How does migration from Mattermost work?
Will we lose conversation history?
How does pricing compare?
What about training for our team?
What support is available?

Ready for collaboration without compromise?

End-to-end encryption, sovereign AI, and granular access controls—with complete deployment flexibility. Discover why organizations trust Rocket.Chat for mission-critical communications.

Schedule Demo