Interact
Interact opens its intranet to outside AI assistants and uses Claude to attack its own platform.
Comparison · Collab
Jellyfin vs Slack
A side-by-side editorial comparison of Jellyfin and Slack — release velocity, themes, recent moves, and the top alternatives to consider.
Jellyfin vs Slack: at a glance
What is Jellyfin?
Seven candidates in, 12.0 is still trading features for correctness in the metadata layer.
RC7 continues the pattern the 12.0 train set: twelve changes, nearly all in the library and metadata layer, and none adding surface. The substantive ones tighten access control — search candidates are now filtered by user access in a single query, and permissions are enforced on similar-items lookups — alongside episode and season counting fixes for virtual items, anime provider IDs on season folders, and progress logging for data migrations. The release still restates the versioning change introduced at RC1, where the leading 10. was dropped so 10.11.x becomes 12.x, and still requires 10.10.7 or 10.11.x as an upgrade floor.
What is Slack?
Slack now hosts any A2A agent without Slack-specific code.
Slack's developer channel is almost all agent plumbing. On 10 November Slack became an A2A (Agent2Agent) client: a team hosts its own agent, publishes an Agent Card, and Slack calls it when people talk to it, with no request URL, event handling or Slack-specific logic. This follows Slackbot skills managed through Web API methods, a Slack CLI that points coding agents to the Slack MCP server, and a new requirement that Work Objects embeds allow the slack-mcps.com frame ancestor.
Jellyfin vs Slack: editorial side-by-side
Jellyfin
5.0COLLAB
Seven candidates in, 12.0 is still trading features for correctness in the metadata layer.
◆ Current state
RC7 continues the pattern the 12.0 train set: twelve changes, nearly all in the library and metadata layer, and none adding surface. The substantive ones tighten access control — search candidates are now filtered by user access in a single query, and permissions are enforced on similar-items lookups — alongside episode and season counting fixes for virtual items, anime provider IDs on season folders, and progress logging for data migrations. The release still restates the versioning change introduced at RC1, where the leading 10. was dropped so 10.11.x becomes 12.x, and still requires 10.10.7 or 10.11.x as an upgrade floor.
◆ Where it's heading
The stated goal of 12.0 has been to polish the backend rewrite that shipped in 10.11.0, and seven candidates in, that is still what the changes are. What has shifted subtly across RC5 to RC7 is the kind of correction: earlier rounds were query-cost work such as SQLite caching and batched lookups, while RC7 pairs performance with access enforcement, folding permission checks into the same queries rather than filtering afterwards. That combination usually appears when a rewrite is being audited rather than extended.
◆ Prediction
The change count per candidate is falling and the remaining work is concentrated in one contributor's metadata fixes, which points to 12.0 going final rather than to an RC8 carrying anything new. Nothing in this feed indicates when.
Slack
6.3COMMSCOLLAB
Slack now hosts any A2A agent without Slack-specific code.
◆ Current state
Slack's developer channel is almost all agent plumbing. On 10 November Slack became an A2A (Agent2Agent) client: a team hosts its own agent, publishes an Agent Card, and Slack calls it when people talk to it, with no request URL, event handling or Slack-specific logic. This follows Slackbot skills managed through Web API methods, a Slack CLI that points coding agents to the Slack MCP server, and a new requirement that Work Objects embeds allow the slack-mcps.com frame ancestor.
◆ Where it's heading
Slack is lowering the cost of putting outside agents in front of its users: first skills as code, then MCP pointers for coding agents, now a standard protocol in place of the Slack app model for agents. The platform is positioning itself as the place where agents built anywhere meet the people who use them.
◆ Prediction
Expect more A2A follow-ups, such as agents appearing in Slackbot or skills surfaces and richer Agent Card features, given how fast the agent releases have stacked up since October.
Jellyfin alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Jellyfin.
Nextcloud
Nextcloud's November patches lean on preview speed and sharing fixes across three branches.
Mattermost
Mattermost v12.1 puts bots and burn-after-reading messages under the same access rules.
Asana
Asana lets Division admins run their own custom roles, on top Enterprise plans only.
Double
Double turns a recorded Chrome session into an agent that repeats the task.
SiYuan
SiYuan 3.8.11 alphas add freeform mind maps and plugin snapshots right after 3.8.10.
Slack alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Slack.
Rspamd
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Twilio
Twilio's voice AI stops cutting callers off mid-sentence, using its own turn-taking model.
Salesmsg
Salesmsg adds call-back requests and a one-click Emergency Stop for all outbound texts.
Element
Element 1.12.35 follows the call picture-in-picture release with one desktop storage fix.
Krisp
Krisp moves call transcripts and live captions to cloud transcription in KrispCX 2.84.4.
Misskey
Misskey 2026.11 ships: a leaner start script, and Node.js 22 no longer boots.
Recent activity from Jellyfin and Slack
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoSlackBring your A2A agents to Slack ⚡
- 8d agoSlackWork Objects embeds require the slack-mcps.com frame ancestor
- 10d agoSlackSlack CLI 4.13 tells coding agents about Slack MCP and Skills
- 10d agoSlackSlack Skills Plugin installs in Claude Code from its own marketplace
- 12d agoSlackUpdated low-usage submission criteria for Slack Marketplace apps
- 15d agoSlackSlack CLI 4.12.0, the fourth CLI release in October
- 2mo agoJellyfinRC7 folds permission checks into search and similar-items queries
- 2mo agoJellyfin12.0 RC6: people and credits lookups stop full-scanning
- 3mo agoJellyfin12.0 RC5: SQLite cache and batched lookups cut query load
- 3mo agoJellyfin12.0 RC4: MP4 track detection and SyncPlay queue fixes
- 3mo agoJellyfin12.0 RC3 reworks bitrate reporting, speeds book collections
- 4mo agoJellyfin12.0 RC2 revamps the startup UI, defers heavy DB tasks in scans
Frequently asked questions
What is the difference between Jellyfin and Slack?
They serve adjacent needs but don't currently overlap on shipped themes. Slack 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 Jellyfin better than Slack?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Slack 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 Jellyfin?
Top Jellyfin alternatives in Collab are ranked by recent ship velocity. Browse the "Jellyfin alternatives" section above for the current picks, or visit /alternatives/jellyfin for the full list with editorial commentary on each.
What are the best alternatives to Slack?
Top Slack alternatives in Collab are ranked by recent ship velocity. Browse the "Slack alternatives" section above for the current picks, or visit /alternatives/slack for the full list with editorial commentary on each.