Interact
Interact opens its intranet to outside AI assistants and uses Claude to attack its own platform.
Comparison · Collab
Joplin vs Slack
A side-by-side editorial comparison of Joplin and Slack — release velocity, themes, recent moves, and the top alternatives to consider.
Joplin vs Slack: at a glance
What is Joplin?
Joplin fixes 50+ server security issues found in a Claude-assisted review of Joplin Cloud.
Joplin added AI in 3.7 (chat, semantic search, MCP), all opt-in, and has since named Mistral's EU endpoint as the provider behind Joplin Cloud AI. Its November 2 post reports a full review of Joplin Server, which also runs Joplin Cloud, done with Claude through Anthropic's Cyber Verification Program: no critical findings, but more than 50 high, medium and lower issues fixed. Self-hosters need 3.7.4 or later, which changes LDAP and SAML sign-in behavior.
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.
Joplin vs Slack: editorial side-by-side
Joplin
5.0COLLAB
Joplin fixes 50+ server security issues found in a Claude-assisted review of Joplin Cloud.
◆ Current state
Joplin added AI in 3.7 (chat, semantic search, MCP), all opt-in, and has since named Mistral's EU endpoint as the provider behind Joplin Cloud AI. Its November 2 post reports a full review of Joplin Server, which also runs Joplin Cloud, done with Claude through Anthropic's Cyber Verification Program: no critical findings, but more than 50 high, medium and lower issues fixed. Self-hosters need 3.7.4 or later, which changes LDAP and SAML sign-in behavior.
◆ Where it's heading
Joplin's recent posts are about trust: privacy terms for AI, a named data processor, and now an audited server. The product is positioning its cloud as safe to put notes in while feature releases stay on a roughly four-month cycle.
◆ Prediction
The next feature release, around 3.8, would fit the four-month cadence in early 2027; the security post suggests more server-side hardening will land in point releases before then.
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.
Joplin alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Joplin.
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 Joplin 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 agoJoplinA full security review of Joplin Server and Joplin Cloud
- 12d agoSlackUpdated low-usage submission criteria for Slack Marketplace apps
- 15d agoSlackSlack CLI 4.12.0, the fourth CLI release in October
- 24d agoJoplinHow we protect your privacy with Joplin Cloud AI
- 2mo agoJoplinYour notes and AI: privacy first
- 2mo agoJoplinWhat's new in Joplin 3.7 ⚡
- 6mo agoJoplinWhat's new in Joplin 3.6
- 8mo agoJoplinIntroducing our Warrant Canary
Frequently asked questions
What is the difference between Joplin 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 Joplin 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 Joplin?
Top Joplin alternatives in Collab are ranked by recent ship velocity. Browse the "Joplin alternatives" section above for the current picks, or visit /alternatives/joplin 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.