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Mattermost Hosting: Secure Team Messaging

Mattermost hosting

Mattermost is the open-source alternative to Slack and Microsoft Teams – a team chat you control entirely yourself.

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Mattermost Hosting Under Your Control

We host Mattermost in a GDPR-compliant way on servers in Germany, so your internal communication runs fast and securely without sensitive conversations sitting on third-party servers. Especially the clean choice for public authorities, healthcare and security-conscious companies.

The essentials of Mattermost hosting

  • Alternative to Slack and Teams for team chat – hosted GDPR-compliantly in Germany.
  • Channels, direct messages, files and threads – you decide on retention and access.
  • Communication under your own control – with SaaS chats every message runs over external servers.
  • For regulated industries like the public sector and industry, where control is mandatory.
  • Single sign-on, tool connections, updates and a dedicated contact.
Discuss your Mattermost setup

SaaS chat vs. self-hosted Mattermost

SaaS chat (e.g. Slack)Self-hosted Mattermost
Data locationThird-party servers (often US)Own infrastructure / servers in Germany
GDPR complianceLimited / SCCs required✓ Fully controllable
Message retentionPlan-dependent, capped✓ Own rules, unlimited
Cost as team growsRises per userInfrastructure flat-rate possible
Suitability for regulated sectors✗ Often insufficient✓ Public sector, healthcare
Integrations & customizationLimited to platform✓ Open via API & plugins

What to know about Mattermost hosting

  1. Communication is sensitive

    Internal chats often contain more confidential information than expected. Self-hosting keeps this data under your own control – an advantage that SaaS chats inherently lack.

  2. Popular in regulated industries

    Mattermost is used precisely where data protection and sovereignty are mandatory – from the public sector to industry.

  3. Familiar to use

    The interface is modeled on established chat tools, so the switch succeeds with little onboarding for your team.

Real Software Successes

Become our next success story

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  • Team chat under your own control

    Mattermost offers channels, direct messages, file sharing and threads – the functions teams know from Slack. Self-hosted, you decide on retention, access and integrations yourself instead of following the rules of a SaaS provider.

  • Data sovereignty

    Your communication is often more sensitive than you think. Self-hosted Mattermost ensures that messages and files do not leave your infrastructure – a decisive advantage for regulated industries and security-conscious teams.

  • Installation & integration

    We set up Mattermost production-ready, connect it to your single sign-on and your tools and configure channels and permissions. Via integrations and webhooks Mattermost connects with your existing systems.

  • Updates & support

    We keep Mattermost up to date, apply security updates and back up your data. For questions or incidents you have a dedicated contact instead of an anonymous support portal.

Mattermost in action

Team chat with channels, threads and integrations – on your own servers.

Mattermost chat interface with channels and messages
Channels, threads and direct messages – the self-hosted Slack alternative.

Brands that work with us

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What matters for Mattermost hosting

With self-hosted Mattermost, the sensitivity of internal communication is at the center. Team chats often hold more confidential information than the participants realize, from personnel matters to business strategy. Self-hosting keeps this data under your own control, and that advantage is fundamentally missing from SaaS chats, where every message runs over external servers.

For regulated industries, control over retention and storage location is not a comfort but an obligation. Mattermost is used precisely where data protection and sovereignty are mandatory, from the public sector to industry. Anyone who must meet such requirements needs a tool where retention rules and data location can actually be controlled, rather than left to a provider.

The often underestimated success factor is team acceptance. A chat platform is only useful if it is used, and Mattermost deliberately follows established tools, so the switch succeeds with little onboarding. In the background, solid operation with reliable availability and tested backups decides whether the tool holds up day to day, precisely because communication must work at all times.

From decision to live operation

A cleanly set-up Mattermost hosting follows a clear sequence – from infrastructure selection through to stable ongoing operation with patched updates.

  1. Requirements & infrastructure

    User count, compliance requirements and existing systems determine the right server sizing and database structure.

  2. Installation & hardening

    Deploy the Mattermost instance, configure TLS, firewall rules and backup strategy – security built in from the start.

  3. Integration with existing tools

    Connect LDAP/AD, SSO, Jira, GitLab or custom webhooks so Mattermost fits seamlessly into your workflows.

  4. Migration & onboarding

    Transfer existing channels and users, introduce the team – the familiar interface keeps the switchover low-friction.

  5. Ongoing operations & updates

    Regular updates, monitoring and backup tests ensure communication stays reliably available at all times.

Each phase closes with a verified state before the next one begins.

Mattermost vs. Slack & Microsoft Teams

Slack bills per user per month, Teams sits inside Microsoft 365. Mattermost is open source and runs on your infrastructure – with no message limit. As of June 2026.

Mattermost (self-hosted)SlackMicrosoft Teams
LicenseOpen source (Free), €0Pro / Business+Part of Microsoft 365
PriceFixed ops, user-independent$7.25–12.50/user/moin the M365 plan (~$12.50/user)
Cost (50 users)Unchanged (fixed fee)~$360–625/moincluded in the M365 plan
Message historyUnlimited (your database)Plan-dependentPlan-dependent
Data ownershipYour own servers in GermanyVendor cloud (US)Vendor cloud (US)

Vendor list prices, as of June 2026 (Slack billed annually). Break-even: from roughly 30–50 users, self-hosted Mattermost is usually cheaper than Slack Business+ – plus full data ownership.

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Frequently asked questions

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Is Mattermost a full Slack replacement?
For most teams, yes: channels, direct messages, threads, file sharing, search and integrations are all there. The decisive difference is control – you decide where the data sits and how long it is retained.
Who benefits most from self-hosted team chat?
Above all organizations with high data-protection or compliance requirements – such as the public sector, healthcare or industry – where internal communication demonstrably must not sit on third-party servers.
Can we connect Mattermost to our Active Directory / SSO?
Yes. Mattermost supports common SSO and directory services. We set up the connection so your team logs in with their existing credentials.

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Team chat you control

With us you're always at the forefront of enterprise software development and benefit directly from our extensive development know-how. Together we examine your business processes, identify key optimization potential and develop individually tailored solutions. Your business goals and expectations are the focal point of everything we do.

  1. Comprehensive technological expertise

    We choose the stack per project by requirement and rely on established, future-proof technologies instead of niche dependencies.

  2. Specialized in enterprise solutions

    The real lever lies in clean interfaces: we integrate deeply into ERP, CRM and third-party systems instead of isolated solutions.

  3. Years of experience in the software industry

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  4. Multidisciplinary expert team

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  5. Long-term business success

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Whether you want to optimize existing systems or introduce new digital solutions: we'd love to meet you and explore new paths together. An initial conversation is the foundation for your success.

What's it about?

Discuss your project +49 (0) 2161 539 71 60
Profile picture of Slawa Ditzel, Executive Partner

Slawa Ditzel

Executive Partner

  1. 30 minutes by video or phone
  2. You talk directly to a partner, not to sales
  3. You get the order of steps, risks and rough costs

+49 (0) 2161 539 71 60info@next-levels.de

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