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Comparison · Collab
CoScreen vs Mattermost
A side-by-side editorial comparison of CoScreen and Mattermost — release velocity, themes, recent moves, and the top alternatives to consider.
CoScreen vs Mattermost: at a glance
What is CoScreen?
CoScreen ships its final build and declares End of Life after a year of quiet.
CoScreen just shipped V8.11.14, explicitly labeled its final software update, alongside an official End of Life announcement. The last real feature release was V8.10 in August 2025 (screen-region sharing plus macOS Tahoe support); the eleven months since produced nothing but this shutdown notice. The multiplayer, multi-window screen-sharing tool for remote teams is being retired rather than iterated.
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.
CoScreen vs Mattermost: editorial side-by-side
CoScreen
3.8COLLAB
CoScreen ships its final build and declares End of Life after a year of quiet.
◆ Current state
CoScreen just shipped V8.11.14, explicitly labeled its final software update, alongside an official End of Life announcement. The last real feature release was V8.10 in August 2025 (screen-region sharing plus macOS Tahoe support); the eleven months since produced nothing but this shutdown notice. The multiplayer, multi-window screen-sharing tool for remote teams is being retired rather than iterated.
◆ Where it's heading
The cadence tells the story: steady usability and performance work through 2024 and into early 2025, a last genuine feature drop in August 2025, then silence until today's EOL. This is a sunset, not a pivot. Users can expect the app to keep running on 8.11.14 but to receive no further fixes or OS-compatibility updates.
◆ Prediction
With EOL declared and a final build shipped, the only moves left are wind-down mechanics: a hard shutdown date, export or migration guidance, and eventual removal from distribution. No further feature work is coming.
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 CoScreen 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 CoScreen 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 CoScreen alternatives → · See all Mattermost alternatives →
Recent activity from CoScreen 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
- 3mo agoCoScreenV8.11.14 Final Software Update ⚡
- 1y agoCoScreenV8.10 Screen Region Sharing & macOS Tahoe Support
- 1y agoCoScreenV8.2.119 New remote window top bar and focus mode
- 2y agoCoScreenV8.1.57 New video layouts and open URLs of shared browser windows
- 2y agoCoScreenV7.10.144: Update for enterprise access
- 2y agoCoScreenV7.10.41: Bug fixes
Frequently asked questions
What is the difference between CoScreen and Mattermost?
They serve adjacent needs but don't currently overlap on shipped themes. Mattermost is currently shipping more aggressively (velocity 6.3 vs 3.8), 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 CoScreen 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 3.8), 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 CoScreen?
Top CoScreen alternatives in Collab are ranked by recent ship velocity. Browse the "CoScreen alternatives" section above for the current picks, or visit /alternatives/coscreen 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.