Mattermost.com
Depends
Confidence: Medium
Buy if you're a regulated, defense, or government team that must self-host chat and has ops staff to run it.
Comparison
Mattermost.com vs Zulip
Zulip
Starting report…
Pick Mattermost.com when
- Defense and government contractors
- Regulated industries needing self-hosting
- DevOps and engineering teams
- Air-gapped or sovereign deployments
When Mattermost.com is not a fit
- Small teams that just want a group chat
- Companies with no sysadmin or DevOps staff
- Anyone expecting a durable free tier
- Mobile-first teams
Sources
- Mattermost Pricingmattermost.comofficial
- Mattermost on GitHub (open source)github.comofficial
- Mattermost Security Updatesmattermost.comofficial
- Mattermost reviews on G2g2.comreview
- Mattermost on Trustpilottrustpilot.comreview
- Mattermost on Google Playplay.google.comreview
review
- CVE-2026-6339 auth bypass (SentinelOne)sentinelone.comsecurity
security
- Mattermost funding and ARR (GetLatka)getlatka.comnews
- news.ycombinator.comnews.ycombinator.comreview