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Comparison · Collab
Slack vs SOGo
A side-by-side editorial comparison of Slack and SOGo — release velocity, themes, recent moves, and the top alternatives to consider.
Slack vs SOGo: at a glance
What is Slack?
Slack's CLI now points coding agents to its MCP server and Skills plugin
Slack's developer channel is mostly agent plumbing. Slackbot skills can be created and managed through Web API methods and kept current from CI, Slack Code lets agents open ephemeral channels with people, and the Slack CLI now tells coding agents that run slack --help about the Slack MCP and Skills Plugin. Alongside sit a new Block Kit layout block and tighter review rules for low-usage Marketplace apps.
What is SOGo?
SOGo's 5.12.13 fixes its largest batch of vulnerabilities yet, some critical.
SOGo, Alinto's self-hosted webmail, calendar and contacts suite, has made almost every 2026 release about security. v5.12.13 on 4 November fixes two SQL injections, a buffer overflow, an LDAP filter injection, path traversal, an impersonation flaw and several unsafe HTML elements, affecting all previous versions. It follows 5.12.11's password reset poisoning fix and 5.12.12's switch to verifying LDAP TLS certificates by default.
Slack vs SOGo: editorial side-by-side
Slack
5.0COMMSCOLLAB
Slack's CLI now points coding agents to its MCP server and Skills plugin
◆ Current state
Slack's developer channel is mostly agent plumbing. Slackbot skills can be created and managed through Web API methods and kept current from CI, Slack Code lets agents open ephemeral channels with people, and the Slack CLI now tells coding agents that run slack --help about the Slack MCP and Skills Plugin. Alongside sit a new Block Kit layout block and tighter review rules for low-usage Marketplace apps.
◆ Where it's heading
Slack is treating AI agents as a primary audience for its developer surface: skills as code, agent workspaces in channels, and now CLI help text written for agents to read. The Marketplace change points the other way, toward less attention for apps nobody installs.
◆ Prediction
Expect more of the CLI and API surface to be documented for agents, likely more MCP-exposed Slack actions. The entries do not show when Slack Code or skills leave developer preview.
SOGo
5.0COLLAB
SOGo's 5.12.13 fixes its largest batch of vulnerabilities yet, some critical.
◆ Current state
SOGo, Alinto's self-hosted webmail, calendar and contacts suite, has made almost every 2026 release about security. v5.12.13 on 4 November fixes two SQL injections, a buffer overflow, an LDAP filter injection, path traversal, an impersonation flaw and several unsafe HTML elements, affecting all previous versions. It follows 5.12.11's password reset poisoning fix and 5.12.12's switch to verifying LDAP TLS certificates by default.
◆ Where it's heading
Outside researchers and coordinators such as VulnCheck are now reporting issues in batches, and each release closes several at once. The fixes are moving from individual XSS paths toward input handling across SQL, LDAP and file paths, which points to a broader audit of the codebase rather than one-off patches.
◆ Prediction
Expect CVE IDs for the 5.12.13 fixes to be published and further 5.12.x security releases at a roughly monthly pace; the entries show no sign of a feature release.
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.
Netcore Cloud
Netcore's blog keeps pitching search-plus-email on one data core, with no product release.
Superhuman
Superhuman gives team admins a console and Enterprise a usage report that counts MCP.
Synapse
Synapse opens the 1.165 cycle on schedule after two 1.164 patches
Whereby
Whereby folds three months into one digest and still lists nothing specific
Rocket.Chat
Rocket.Chat's fifth 9.0 candidate is about load: notifications, presence and startup.
SOGo alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with SOGo.
SiYuan
SiYuan's sixth 3.8.10 alpha repeats alpha.5's list as the release nears beta.
Teable
Teable previews the damage before a schema change and lets Routines run as their owners.
GitHub
GitHub puts Copilot inside Xcode's own coding assistant, a week after JetBrains Air.
Paperless-ngx
Paperless-ngx follows its busy October with a fixes-only 3.4.2
Immich
Immich's 3.4 candidate adds passkeys and built-in backups.
HedgeDoc
HedgeDoc 1.12.1 fixes seven advisories, then gets pulled for a PostgreSQL migration bug
Recent activity from Slack and SOGo
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSOGoSOGo 5.12.13 fixes SQL injections, overflow and impersonation
- 1d agoSlackSlack CLI 4.13 tells coding agents about Slack MCP and Skills
- 3d agoSlackUpdated low-usage submission criteria for Slack Marketplace apps
- 6d agoSlackSlack CLI 4.12.0, the fourth CLI release in October
- 7d agoSlackNew Block Kit layout block
- 8d agoSlackSlackbot skills API methods are here!
- 14d agoSlackSlack CLI 4.11.0 ships with no change notes
- 23d agoSOGoSOGo 5.12.12 fixes a vulnerability, enforces LDAP TLS checks
- 1mo agoSOGoSOGo 5.12.11: reset poisoning and XSS fixed, new required setting
- 2mo agoSOGoFour more vulnerabilities patched; all prior versions affected
- 5mo agoSOGoPatch undoes 5.12.8 regressions in preferences and mail display
- 5mo agoSOGoTwo CVEs fixed for PostgreSQL user sources
Frequently asked questions
What is the difference between Slack and SOGo?
They serve adjacent needs but don't currently overlap on shipped themes. Slack and SOGo are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Slack better than SOGo?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Slack and SOGo are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Collab products to evaluate alongside.
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.
What are the best alternatives to SOGo?
Top SOGo alternatives in Collab are ranked by recent ship velocity. Browse the "SOGo alternatives" section above for the current picks, or visit /alternatives/sogo for the full list with editorial commentary on each.