Back to All Reviews
Communication

Mattermost

Open-source team messaging for developers

Founded:2016
Employees:300+
Free (Enterprise $10/user/mo)
pricing model
4.2/ 5.0
G2:4.2/5
Capterra:4.3/5
Trustpilot:4.1/5
Visit Website

Key Features

Self-hosted on your own servers
Open-source (Apache 2.0 license)
End-to-end encryption
Unlimited users on free plan
Custom bot framework
Mobile apps for iOS and Android

Feature Highlights

Self-Hosted

Deploy on your AWS/GCP/on-prem servers - your data never leaves your infrastructure

Open Source

Audit code, customize features, contribute back - full transparency

Compliance Ready

HIPAA, FINRA, GDPR compliant with audit logs and data residency

DevOps Workflows

ChatOps integrations for Jenkins, GitLab CI, Kubernetes alerts

Pros

  • Self-hosted option
  • Open source
  • Strong security
  • Free tier generous

Cons

  • Requires technical setup
  • Fewer integrations
  • UI not as polished
  • Smaller community

What Users Say

"We can't use cloud chat for compliance reasons. Mattermost on our servers solves that perfectly."

Robert Wilson
CISO
SecureBank

"Being open-source means we can audit the code. That's non-negotiable for government contracts."

Lisa Brown
DevOps Lead
GovTech Solutions

"Setup took a weekend, but now we control our data. No Slack bills, no limits, full control."

Kevin Park
Engineering Manager
PrivacyFirst

✅ Best For

Security-focused dev teams

❌ Not Best For

Non-technical teams

Integrations

jira
github
gitlab

Top Alternatives

View All Alternatives →
Slack
Popular team chat platform
$8/user/mo
Microsoft Teams
Enterprise chat with Office integration
$12/user/mo (includes Office 365)