Mattermost Alternative to Slack: Self-Hosted and Managed
Escape Slack's per-user billing and message limits. Mattermost gives you full control. Self-host it, or let Opsily manage the infrastructure.
Why Teams Leave Slack
Slack works until your headcount grows. A 50-person team spends $4,350 per year on Pro. Messages vanish after 90 days. Exporting your history is friction.
The real pain:
- Per-user cost scales fast. Add 10 people, add $870/year. Mattermost charges one rate, any size team.
- Message limits. Slack Pro deletes messages after 90 days. Zulip and Mattermost keep forever.
- Data in the US. Slack's GDPR compliance is policy. If you're under NIS2 or stricter DPA rules, self-hosting in German or Dutch data centers is required.
- Vendor lock-in. No bulk export. Integrations break when you leave. Migrating costs time and money.
Mattermost solves all four. Self-host for $0/month (plus ops labor), or let Opsily manage it flat-rate with EU data residency.
Mattermost vs. Slack: The Real Difference
Pricing as of 2026. Slack Pro billed annually.
Rocket.Chat
Best for: Teams needing SMS, WhatsApp, live chat integration.
43.7K GitHub stars. E2E encryption, omnichannel widgets, federation. Self-hosted or managed tiers.
Trade-off: More features = steeper setup. Smaller community than Slack.
Zulip
Best for: Async-heavy, deep-discussion teams.
Mandatory topic threading keeps conversations organized. 130+ integrations. Cloud at $6.67/user/month or self-hosted at $3.50/user/month.
Trade-off: Topic-only model. Not Slack-alike. Smaller ecosystem.
Element (Matrix)
Best for: Decentralized federation, maximum portability.
Open protocol (Matrix), E2E by default, no single failure point. Self-hosted Synapse or Conduit.
Trade-off: Less mature than Slack or Mattermost. Steep learning curve for ops teams.
Self-host Mattermost free
Docker + your server. Zero licensing. Backups, updates, and scaling are on you.
Compare managed Opsily pricingOpsily Managed Mattermost: The Self-Hosted Alternative to Slack
Stop managing infrastructure. We run Mattermost for you: EU-first, flat-rate, all features included.
EU Data Residency, Full Control
Your data stays in ISO 27001-certified German data centers. We sign a Data Processing Agreement. No US jurisdiction. GDPR-compliant by design. You own your data, always.
Flat-Rate, Unlimited Users
No per-seat billing. Same price for 10 people or 100. Includes all features: playbooks, workflow automation, AI/LLM integration, unlimited message history, 700+ app integrations.
Daily Backups, Automatic Updates
We handle infrastructure: encrypted daily backups, automatic updates, 24/7 monitoring. You focus on team productivity. Ops burden goes to zero.
Built for teams who need reliability
Migration from Slack: 3 Steps
Switch to Opsily's Mattermost in minutes. Full history, zero message loss.
Pick your region: Germany, Netherlands, UK, or Finland. We set up your server, SSL, backups, monitoring. Live in minutes.
Export conversations, files, users from Slack. Our import tool loads them into Mattermost. No message loss. All history transfers.
Send invites via Slack, email, LDAP, or SAML. Mobile app, desktop, browser. Integrations (GitHub, Zapier, Jira) ready to reconnect.
Pick your region: Germany, Netherlands, UK, or Finland. We set up your server, SSL, backups, monitoring. Live in minutes.
Export conversations, files, users from Slack. Our import tool loads them into Mattermost. No message loss. All history transfers.
Send invites via Slack, email, LDAP, or SAML. Mobile app, desktop, browser. Integrations (GitHub, Zapier, Jira) ready to reconnect.
We provision your instance
Pick your region: Germany, Netherlands, UK, or Finland. We set up your server, SSL, backups, monitoring. Live in minutes.
Bulk import from Slack
Export conversations, files, users from Slack. Our import tool loads them into Mattermost. No message loss. All history transfers.
Invite your team and go live
Send invites via Slack, email, LDAP, or SAML. Mobile app, desktop, browser. Integrations (GitHub, Zapier, Jira) ready to reconnect.
Opsily Mattermost Plans
All plans include unlimited users, 700+ integrations, EU data residency, daily backups, and 24/7 monitoring.
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Frequently Asked Questions
Everything you need to know about Mattermost and Opsily hosting.
Mattermost is open-source and self-hosted. Slack is proprietary SaaS. Mattermost gives you full data ownership and control—no vendor lock-in. You choose where your data lives. Slack charges per user ($7.25–$12.50/month); Mattermost's open-source tier is free (ops cost only). Mattermost also keeps message history forever; Slack Pro deletes after 90 days. For teams prioritizing cost, data control, and compliance, Mattermost wins.
Ready to leave Slack?
Try Opsily's managed Mattermost free. 14 days, no credit card required, full feature access.