Comparison

Mattermost.com vs Discord - Group Chat That's All Fun & Games

Mattermost.com and Discord - Group Chat That's All Fun & Games both land on Depends.

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.

Depends

Confidence: Medium

Buy it for gaming crews, friend groups, and hobby communities that want free voice, video, and text hangouts.

Mattermost.com versus Discord - Group Chat That's All Fun & Games
Compare	Mattermost.com	Discord - Group Chat That's All Fun & Games
Verdict	Depends	Depends
Best for	Defense and government contractors	Gaming friend groups
Who it's not for	Small teams that just want a group chat	Businesses needing searchable, auditable work chat
Privacy	Active security program with bug bounty and routine scans, but several recent CVEs are disclosed, including an auth bypass.^⁸	No known public vulnerabilities found in the sources reviewed.¹²
Support quality	No support quality evidence found	Account issues redirected away; no clear official support path
Public sentiment	Engineers praise the self-hosted threading model while users report slow mobile apps, message-history paywalls, and shrinking free features.^⁴	Users love the casual hangout experience but complain about Windows 11 performance, tedious bulk message deletion, and community-only support.¹⁵
Biggest gotcha	Entry edition locks message history after 10,000 messages . older messages sit behind paid plans.	Third-party client mods breach ToS and can expose accounts to malicious code¹⁴