Mattermost vs Rocket.Chat: what their users struggle with

Not a verdict and not a star rating: the problems users of Mattermost and Rocket.Chat describe in public, side by side, each one linked to its source (as of 2026-10-15).

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Every count in this table is of open reports in the recent window (Mattermost since 2023-10, Rocket.Chat since 2023-10); older and fixed reports are not counted. The counts measure how much public discussion exists for each product, not which is better: a popular tool collects more reports.

Problems mostly raised about Mattermost

• Upgrade from 5.38 to 6.0 fails with a database column conversion error · Self-hosting & upgrades · Blocks work
• GitLab SSO fails or needs workarounds · Permissions & security · Annoyance
• Self-hosted push notifications still go through vendor's central APNS proxy · Permissions & security · Annoyance
• Frequent Firefox freezes after upgrade to 10.5.4 · Performance · Blocks work
• Android web app native back button does not navigate back · Mobile · Blocks work

Problems mostly raised about Rocket.Chat

• Workspace registration cannot be skipped in 6.5 · Setup & onboarding · Blocks work
• Inconsistent aria-invalid semantics across registration forms · UI & usability · Annoyance
• SAML sign-in loops after IdP MFA on mobile · Reliability & bugs · Blocks work
• Absolute URL detection rejects uppercase URL schemes · API & developer experience · Annoyance
• Message search date filters shift with timezone differences · Reporting & analytics · Blocks work

Go further

Open Mattermost and Rocket.Chat in the compare tool to filter by area and severity, Mattermost alternatives, Rocket.Chat alternatives, or the state of team chat.

How the data is built. A theme is a group of reports about the same problem; unique means not matched to a theme on the other product.