Hive
Hive is building the plumbing its Buzz AI snippets need to run on real team data
Comparison · Collab
Capacities vs Slack
A side-by-side editorial comparison of Capacities and Slack — release velocity, themes, recent moves, and the top alternatives to consider.
Capacities vs Slack: at a glance
What is Capacities?
AI stopped being a bundled feature at Capacities and became the thing you buy more of
Capacities ships a numbered release every few weeks across its knowledge-base app — objects, tabs, the editor, presentation mode — with AI threaded through most of them. Recent releases added a choice of AI model provider, chat connectors, image analysis for Pro users, and in July a full public API. The newest release introduces Pro+ and Believer+, optional paid add-ons that raise the monthly AI budget and sell top-ups on top of it.
What is Slack?
Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
Slack's developer platform runs two tracks. The agent build-out has produced a spark roughly every two weeks since June — MCP client, a skills plugin targeting Claude Code and Cursor, and Slack Code — and now has a consolidation date attached: assistant_view is deprecated in February 2027, replaced by an Agent Sessions API. The second track is platform administration and tooling, and this window belongs to it: Marketplace submissions again require at least ten installed active workspaces, held throughout the review, after a period at a lower temporary threshold. The CLI has shipped three times since late July.
Capacities vs Slack: editorial side-by-side
Capacities
3.8COLLAB
AI stopped being a bundled feature at Capacities and became the thing you buy more of
◆ Current state
Capacities ships a numbered release every few weeks across its knowledge-base app — objects, tabs, the editor, presentation mode — with AI threaded through most of them. Recent releases added a choice of AI model provider, chat connectors, image analysis for Pro users, and in July a full public API. The newest release introduces Pro+ and Believer+, optional paid add-ons that raise the monthly AI budget and sell top-ups on top of it.
◆ Where it's heading
Two arcs are converging. The first opened the product up: API 2.0 made the knowledge base programmable, and connectors let outside assistants reach it. The second is now closing around cost — AI has moved from a bundled capability to a budgeted one, and the new tiers charge for consumption rather than for features. Read together, Capacities is treating the knowledge base as the durable asset and inference as a metered resource priced separately from it.
◆ Prediction
Expect AI budget to become an explicit dimension of the plan comparison, with limits and top-up sizing tuned in follow-up releases. The entries do not show how the budget is measured, so the unit being sold remains unclear.
Slack
6.3COMMSCOLLAB
Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
◆ Current state
Slack's developer platform runs two tracks. The agent build-out has produced a spark roughly every two weeks since June — MCP client, a skills plugin targeting Claude Code and Cursor, and Slack Code — and now has a consolidation date attached: assistant_view is deprecated in February 2027, replaced by an Agent Sessions API. The second track is platform administration and tooling, and this window belongs to it: Marketplace submissions again require at least ten installed active workspaces, held throughout the review, after a period at a lower temporary threshold. The CLI has shipped three times since late July.
◆ Where it's heading
The install requirement moving back up is a distribution decision arriving in the middle of a platform push, and the two point the same way. Slack is making it easier to build agents and harder to list one, which favours developers who already have distribution — existing workspace tools and vendors — over a new app hoping the Marketplace supplies its first users. Combined with the assistant deprecation and the Agent Sessions API, the platform is narrowing on one agent surface and one class of builder rather than widening the funnel.
◆ Prediction
The threshold is described as a return from a temporary lower bar rather than a new policy, so the open question is what replaces the Marketplace as the discovery path for an app that cannot reach ten workspaces on its own. These entries do not answer it.
Capacities alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Capacities.
Mattermost
Mattermost is selling sovereignty and air-gapped AI, with releases buried in the argument
Paperless-ngx
Paperless-ngx is patching hard behind a 3.1 release that made AI a workflow step
Read the Docs
Read the Docs ships a dated release every week, and this one is documentation and dependencies
Zoho Sign
Zoho Sign is clearing the exit path off Docusign while stacking up regional legal assurance
Jellyfin
Seven candidates in, 12.0 is still trading features for correctness in the metadata layer.
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.
Synapse
Synapse publishes only a changelog link, so its feed records releases without describing them
Element X Android
Element X Android ships roughly weekly, alternating real features with fix rounds
Wire
Calling is the one surface Wire's web client touches in every documented release.
Zoho Cliq
Zoho retells Cliq 7.0 as an AI story, and lets customers pick whose model tells it.
Rocket.Chat
Rocket.Chat finishes the 8.8 calling work while the licence wall for SSO gets a date.
Bandwidth
Bandwidth sells trust in the call, and self-service everywhere it used to sell tickets.
Recent activity from Capacities and Slack
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSlackUpdated installation requirement for Slack Marketplace apps
- 2d agoSlackCLI adds app-approval status checks and custom app icons
- 13d agoSlackAnnouncing Slack Code ⚡
- 13d agoSlackAgent Sessions API replaces assistant_view, deprecated Feb 2027
- 16d agoCapacitiesCapacities Pro+ and Believer+ ⚡
- 1mo agoSlackAnnouncing the Slack MCP and Skills Plugin ⚡
- 1mo agoSlackCLI adds manifest diff and a Block Kit preview command
- 1mo agoCapacitiesReliability polish across dates, tabs, editor, and presentation mode
- 1mo agoCapacitiesCapacities API 2.0, Weblink Analysis, and Presentation Mode ⚡
- 2mo agoCapacitiesAI Chat Connectors 2.0 + Many improvements
- 3mo agoCapacitiesBulk Import for Everyone, Image Analysis for Pro, and Continuous Improvements
- 4mo agoCapacitiesRecurring Tasks and Choose Your Capacities AI Model Provider
Frequently asked questions
What is the difference between Capacities and Slack?
They serve adjacent needs but don't currently overlap on shipped themes. Slack is currently shipping more aggressively (velocity 6.3 vs 3.8), with 1 editorial sparks in the last 30 days against 1. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Capacities 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 3.8), with 1 editorial sparks in the last 30 days against 1. For your specific use case, the alternatives sections above list other Collab products to evaluate alongside.
What are the best alternatives to Capacities?
Top Capacities alternatives in Collab are ranked by recent ship velocity. Browse the "Capacities alternatives" section above for the current picks, or visit /alternatives/capacities 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.