Microsoft Teams Alternatives: Go Open-Source, Drop the Lock-In
Slack, Zoom, Rocket.Chat, Nextcloud Talk, or Mattermost on Opsily. Compare costs, compliance, and features. Stop paying Microsoft for chat.
The Best Microsoft Teams Alternative: Mattermost on Opsily
Stop renting chat from Microsoft. Open-source collaboration, managed hosting, and data control.
No Lock-In. Open Source.
MIT-licensed Mattermost runs on your terms. 39.4K GitHub stars prove it. Export your data anytime. No Microsoft, no Slack pricing games.
Managed Hosting, EU Data Residency
Opsily runs Mattermost in ISO 27001-certified German data centers. GDPR compliant. Automated backups and updates. You deploy once, we handle the ops.
300+ Integrations. Built for Teams.
Jira, GitHub, GitLab, Zoom, Slack, Microsoft Sentinel. Voice calls and screen sharing built in. AI summarization. Incident response playbooks.
Built for teams who need reliability
Microsoft Teams fails SMBs. Here's why.
Hidden costs. Microsoft Teams locks you into M365 bundles. Add Slack pricing ($8.75/user/month) or Zoom ($14.16/user/month) and suddenly chat gets expensive. Small teams with 10-25 people see surprise invoices.
Message history limits. Teams deletes messages after 60 days unless you pay for archiving. Miss a decision from last quarter? Search fails. That's not collaboration; that's planned obsolescence.
Vendor lock-in. Microsoft owns your data. Export it? Microsoft makes it painful. Switch platforms? Data stays locked. No compliance control, no data residency options beyond Microsoft's data centers.
HIPAA gaps. Teams is not HIPAA-compliant by default. Healthcare organizations, therapists, and medical device teams cannot use it. Switching to self-hosted Mattermost or Rocket.Chat (which explicitly supports HIPAA) is non-negotiable for regulated industries.
Too many features you don't need. Teams bundles email, Office, OneDrive, and Copilot. SMBs pay for enterprise overhead they'll never use. Mattermost gives you chat, calls, and integrations. Nothing more. Nothing less.
Side-by-side: Slack, Zoom, Nextcloud Talk, Rocket.Chat, Element, and Mattermost
| Feature | Slack | Zoom Workplace | Nextcloud Talk | Rocket.Chat | Element | Mattermost on Opsily |
|---|---|---|---|---|---|---|
| Per-user cost | EUR 8.25/mo | EUR 16.99/mo | EUR 3.50-17/mo | Contact sales | Free | Flat rate, no metering |
| Self-hosted | X | X | V | V | V | V |
| GDPR compliant | V (EU option) | V (EU region) | V | V | V | V |
| Message history | 90 days (free) | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited |
| Video calls | Optional plugin | Native | Native | Native | Native | Native + screen share |
| GitHub integrations | V (limited) | X | V | V | Limited | 300+ apps |
| HIPAA ready | X | X | V | V | V | V |
| Open source | X | X | V | V | V | V |
| Data residency | EU region | EU region | Self-hosted | Self-hosted | Self-hosted | German DC (ISO 27001) |
| Compliance audit | SOC 2, ISO 27001 | SOC 2 | Self-hosted | ISO 27001, SOC 2 Type 2 | Self-hosted | EU hosting |
The takeaway: Slack and Zoom dominate because they're easy. But for teams that care about cost, compliance, and not paying a metering tax, Mattermost + Opsily wins. No per-user cost. Unlimited message history. Full source code transparency.
Minimum per year for Slack + Zoom at 25 people.
Slack Pro: EUR 8.25/user/month. Zoom Workplace: EUR 16.99/user/month. Total for 25 people x 12 months = EUR 6,261/year. Mattermost on Opsily includes both chat and video at one flat price.
Deploy Mattermost on Opsily in 4 Steps
From signup to live chat: 10 minutes. No Docker, no Kubernetes, no ops team needed.
Email, password, choose your EU region (Germany, Netherlands, etc.). No credit card for the trial.
Select your plan (Small, Medium, Large). Opsily provisions the server, database, and SSL in 3 minutes.
Send signup links. SSO integration with GitHub, Google, or SAML available. Teams join within minutes.
Email, password, choose your EU region (Germany, Netherlands, etc.). No credit card for the trial.
Select your plan (Small, Medium, Large). Opsily provisions the server, database, and SSL in 3 minutes.
Send signup links. SSO integration with GitHub, Google, or SAML available. Teams join within minutes.
Create your Opsily account
Email, password, choose your EU region (Germany, Netherlands, etc.). No credit card for the trial.
Click Deploy Mattermost
Select your plan (Small, Medium, Large). Opsily provisions the server, database, and SSL in 3 minutes.
Invite your team
Send signup links. SSO integration with GitHub, Google, or SAML available. Teams join within minutes.
Migrate Teams history (optional)
Export Teams messages via PowerShell, import via Mattermost CLI. Opsily provides migration templates and support.
Transparent Pricing. No Per-User Tax.
All Opsily plans include GDPR-compliant German hosting, automatic backups, SSL, and 24/7 monitoring. No hidden per-seat costs. Upgrade anytime.
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Enterprise Trust. No Compromise.
Open-source, auditable, and compliant. Your data, your rules.
GDPR Compliant
EU data residency by design. All data stays in German data centers. No data transfers to the US.
Open-Source MIT License
Mattermost source code is public on GitHub. 39.4K stars, 23,681 commits. Audit it yourself. No black boxes.
No Vendor Lock-In
Export your data anytime. Run Mattermost anywhere. Move to another host, your data comes with you.
300+ Integrations Ready
Jira, GitHub, GitLab, Slack, Zoom, Zendesk, Sentry, PagerDuty. Work with your existing tools without switching cost.
Encryption & Audit Logging for Compliance
Mattermost supports FIPS 140-3, end-to-end encryption, and audit logging. Opsily can configure for regulated teams.
Microsoft Teams Alternatives: Your Questions Answered
Microsoft Teams exports messages via PowerShell scripts; Mattermost accepts bulk imports via CLI tools. Opsily provides migration templates and walk-throughs. Most teams move within a few hours: export Teams history, import to Mattermost, invite users via email or SSO (GitHub, Google, SAML). File attachments, threads, and metadata transfer cleanly. If you want hands-on help, Opsily support can assist with larger migrations (100+ users). Start with a small pilot team first to test integrations.
Stop Paying Microsoft. Go Open-Source Today.
Mattermost on Opsily: no per-user billing, GDPR compliant, 300+ integrations. Start your free trial. No credit card.