Mattermost Alternative Client: Which Platform Is Right for Your Team?
Evaluating open-source chat platforms or looking to leave Slack? Compare Mattermost with Rocket.Chat, Element, and other self-hosted or commercial alternatives. See pricing, features, and deployment options.
Why Teams Look for Mattermost Alternatives
Mattermost is a powerful open-source team collaboration platform. But it is not the only option. Teams leave Slack for Mattermost when they need data ownership and EU compliance. Teams compare Mattermost to Rocket.Chat when they want to cut costs. Teams evaluate Element when privacy through end-to-end encryption matters most.
The right alternative depends on three things: your budget model, your compliance requirements, and whether you want open-source flexibility or managed simplicity.
The Contenders
Mattermost is the enterprise-grade open-source choice. 39,200 GitHub stars. Used by Uber (70,000 concurrent users), the U.S. Department of Defense, and teams that cannot store chat data in U.S. clouds. No per-user pricing. Mission-critical by design.
Slack is the market leader for teams that choose simplicity over cost. €6.75-€8.25 per user per month for Pro. €15 per month for Business+. Unlimited team members but unlimited bills.
Rocket.Chat is the open-source challenger. $8 per user per month for Pro. Starter tier free forever for up to 50 users. Self-hosted by default, cheaper than Slack per seat, full community fork available.
Element (formerly Riot) runs on the Matrix protocol. Decentralized, end-to-end encrypted by default, EU-focused (ISO 27001 certified). Pricing is custom; community version is free but unsupported.
Zulip is the niche player: topic-based threading instead of channels. Optimized for async teams and open-source communities. Smaller install base but loyal users.
Mattermost vs. Leading Alternatives: Head-to-Head
How the top open-source and commercial chat platforms stack up.
Slack pricing in EUR (2026). Opsily managed Mattermost removes per-user scaling — ideal for teams with 10–500 members.
Mattermost vs. Rocket.Chat: Open-Source Shootout
Mattermost vs. Element: Open-Source + Privacy
Why Opsily for Mattermost
Self-hosting Mattermost means ops overhead. Opsily removes that burden.
EU Data Residency Without Negotiation
Your Mattermost data lives in ISO 27001-certified German data centers. GDPR-compliant from day one. No per-country negotiations with Slack. No data export to U.S. clouds. No compliance theater. Deployed. Done.
Flat-Rate Pricing at Any Scale
Slack charges per user. Rocket.Chat charges per user. Mattermost with Opsily scales with server size, not headcount. Add 100 team members without touching your bill. Pricing grows with your company, not your org chart.
Managed Infrastructure: You Don't Patch It
Opsily handles nightly encrypted backups, SSL certificates, security updates, and monitoring. You deploy once, then use your platform. No incident-at-2am. No version compatibility nightmares. Mattermost stays current while you focus on your business.
Built for teams who need reliability
Choose Mattermost If...
- You need flat-rate pricing that doesn't scale per user.
- Your team stores sensitive data that must stay in the EU (GDPR, regulatory).
- You are leaving Slack and want to shed per-user licensing.
- You need mission-critical reliability (DoD-grade deployments prove this).
- Your ops team is small and you want managed infrastructure.
Choose Rocket.Chat If...
- Budget is your primary constraint and per-user economics matter.
- You want a smaller alternative with a tighter community.
- You already run your own Kubernetes or Docker infrastructure.
Choose Element If...
- End-to-end encryption and decentralization are non-negotiable.
- Your threat model includes nation-state adversaries.
- You want to run a federated network across multiple organizations.
Choose Slack If...
- Your team does not care about data residency or vendor lock-in.
- You have unlimited budget and integration sprawl doesn't bother you.
- Speed of implementation matters more than long-term cost.
Opsily Managed Mattermost Pricing
One-time setup, then transparent monthly billing. No per-user surprises. German ISO 27001 data centers included in every plan.
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Trust & Security Built In
Opsily removes compliance work from your checklist.
GDPR Compliant
Your data is stored exclusively in German data centers. GDPR compliance is built into the infrastructure, not a feature you pay extra for.
Enterprise German Infrastructure
Your Mattermost runs on enterprise-grade German hosting with automatic backups, redundancy, and security monitoring built in.
Encrypted Backups (Daily)
Every night, Opsily creates encrypted backups and stores them separately. Restoration in minutes if needed. You control the encryption key.
No Vendor Lock-In
Mattermost is open-source. Your data is your data. Export it anytime. Run it elsewhere. No licensing surprises, no account holds, no surprise price hikes.
24/7 Monitoring
Opsily's monitoring catches issues before they affect your team. Automated alerts. Redundant systems. We stay awake so you do not have to.
Get Running in 3 Steps
From sign-up to first message in under an hour.
Email, password, choose your plan. No credit card for the free trial. Takes 2 minutes.
Click 'Deploy Mattermost' in your dashboard. Opsily provisions your server, generates SSL, sets up backups automatically. You wait 3 minutes.
Configure SSO (optional), send invite links, your team signs in. First message happens in hour one. Opsily's playbooks are ready to automate workflows immediately.
Email, password, choose your plan. No credit card for the free trial. Takes 2 minutes.
Click 'Deploy Mattermost' in your dashboard. Opsily provisions your server, generates SSL, sets up backups automatically. You wait 3 minutes.
Configure SSO (optional), send invite links, your team signs in. First message happens in hour one. Opsily's playbooks are ready to automate workflows immediately.
Create Your Opsily Account
Email, password, choose your plan. No credit card for the free trial. Takes 2 minutes.
Deploy Mattermost
Click 'Deploy Mattermost' in your dashboard. Opsily provisions your server, generates SSL, sets up backups automatically. You wait 3 minutes.
Invite Your Team
Configure SSO (optional), send invite links, your team signs in. First message happens in hour one. Opsily's playbooks are ready to automate workflows immediately.
Migrate from Slack or Discord (Optional)
Opsily provides migration guides and tools for exporting channels, messages, and files. Most teams migrate in one weekend. Full data history transfers.
Questions About Mattermost Alternatives
The top alternatives depend on your priorities. Slack dominates the commercial market but charges per user and stores data in U.S. clouds. Rocket.Chat is the open-source peer—slightly cheaper per seat, full self-hosted control. Element uses the Matrix protocol for end-to-end encryption and decentralized federation, ideal for privacy-first teams. Zulip offers topic-based threading instead of channels, perfect for async-first organizations. All except Slack are open-source. Your choice depends on budget model, compliance needs, and whether you want managed or self-hosted.
Stop Comparing. Start Using.
Try Opsily's managed Mattermost free for 14 days. No credit card. Full features. EU data residency included.