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Comparison · Collab
Flarum vs Mattermost
A side-by-side editorial comparison of Flarum and Mattermost — release velocity, themes, recent moves, and the top alternatives to consider.
Flarum vs Mattermost: at a glance
What is Flarum?
Flarum's 2.0 candidates are accelerating, but the feed publishes only a link per tag.
Flarum is eight release candidates into 2.0, with rc.6, rc.7, and rc.8 landing within five days after a gap of roughly seven weeks following rc.5. The feed carries no notes: each entry is a single line pointing at the CHANGELOG.md for that tag, so the content of these candidates is not visible here. The last entry with substantive text was rc.1 in April, which addressed discussion-list and notification query costs.
What is Mattermost?
Mattermost v12 puts user-scoped permissions, private models and audit trails on every agent action.
Mattermost's feed spent five weeks on security and resilience essays; the last product release was v11.11's data-spillage exposure report. v12 changes that: agents now act with the requesting user's access rather than a shared service account, can run on private models, and leave an audit trail per action. The announcement is short on detail, but the pitch is clear and aimed at defense and regulated buyers.
Flarum vs Mattermost: editorial side-by-side
Flarum
5.0COLLAB
Flarum's 2.0 candidates are accelerating, but the feed publishes only a link per tag.
◆ Current state
Flarum is eight release candidates into 2.0, with rc.6, rc.7, and rc.8 landing within five days after a gap of roughly seven weeks following rc.5. The feed carries no notes: each entry is a single line pointing at the CHANGELOG.md for that tag, so the content of these candidates is not visible here. The last entry with substantive text was rc.1 in April, which addressed discussion-list and notification query costs.
◆ Where it's heading
Tempo is the only signal this feed supports, and it has clearly changed: three candidates in five days after seven quiet weeks reads as convergence on a final rather than continued development. What is actually changing between candidates cannot be determined from this source without following the linked changelog.
◆ Prediction
A 2.0.0 final looks near given the candidate cadence, but this feed will not say what it contains.
Mattermost
6.3COLLAB
Mattermost v12 puts user-scoped permissions, private models and audit trails on every agent action.
◆ Current state
Mattermost's feed spent five weeks on security and resilience essays; the last product release was v11.11's data-spillage exposure report. v12 changes that: agents now act with the requesting user's access rather than a shared service account, can run on private models, and leave an audit trail per action. The announcement is short on detail, but the pitch is clear and aimed at defense and regulated buyers.
◆ Where it's heading
The essays on zero trust, data spillage and out-of-band response were building toward this. Mattermost is positioning its AI agents as governed, mission-safe tools inside its classified-environment niche rather than competing on agent breadth. The in-house Matty Code agent shows it also uses agents to build the product itself.
◆ Prediction
Expect v12.x follow-ups that publish admin controls and audit-log detail for agent actions, plus more deployment-focused content aimed at defense buyers.
Alternatives to Flarum and Mattermost
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Flarum or Mattermost.
SiYuan
SiYuan 3.8.9 reaches RC, adding AI-agent extraction of images embedded in PDFs.
KACE
KACE extends its PHP2SHELL fix to the SDA deployment appliance, six days after disclosure.
AFFiNE
AFFiNE's canaries stay on upkeep: a Swift Collections bump follows CVE and migration fixes.
Teable
Teable's Structured Query v2 now reports across multi-hop relations, with a strict mode against SQL.
Readwise
Readwise splits its bundle into Reader-only and Highlights-only plans and renames its first app.
See all Flarum alternatives → · See all Mattermost alternatives →
Recent activity from Flarum and Mattermost
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 3d agoMattermostMattermost v12 Cross Guard: managed cross-domain transfers
- 6d agoMattermostMattermost v12: Agents Are Doing the Work. Now Control What They Can See. ⚡
- 15d agoMattermostWhere the Response Team Talks After the Gateway Falls
- 23d agoMattermostThe Conversation Is the Operation: Defending Collaboration Infrastructure Like an Intelligence Asset
- 23d agoMattermostTwo Outages, One Vendor, One Lesson in Resilience Planning
- 23d agoMattermostOur Newest Top Contributor Is an AI Agent: 4 Months of Matty Code
- 2mo agoFlarumv2.0.0-rc.8
- 2mo agoFlarumFlarum 2.0 release candidate 7
- 2mo agoFlarumFlarum 2.0 release candidate 6
- 3mo agoFlarumFlarum 2.0 release candidate 5
- 4mo agoFlarumFlarum 2.0 release candidate 4
- 4mo agoFlarumFlarum 2.0 release candidate 3
Frequently asked questions
What is the difference between Flarum and Mattermost?
They serve adjacent needs but don't currently overlap on shipped themes. Mattermost is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Flarum better than Mattermost?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Mattermost is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Collab products to evaluate alongside.
What are the best alternatives to Flarum?
Top Flarum alternatives in Collab are ranked by recent ship velocity. Browse the "Flarum alternatives" section above for the current picks, or visit /alternatives/flarum for the full list with editorial commentary on each.
What are the best alternatives to Mattermost?
Top Mattermost alternatives in Collab are ranked by recent ship velocity. Browse the "Mattermost alternatives" section above for the current picks, or visit /alternatives/mattermost for the full list with editorial commentary on each.