Rspamd
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Comparison · Comms
Brosix vs Slack
A side-by-side editorial comparison of Brosix and Slack — release velocity, themes, recent moves, and the top alternatives to consider.
Brosix vs Slack: at a glance
What is Brosix?
Brosix 6.0 redesigns the 20-year-old messenger and upgrades calls and search.
Brosix is a 20-year-old team messenger. Version 6.0 brings a redesigned interface, clearer calls, better search and more consistent behaviour across desktop and mobile. It follows private channels and communities for clients and partners in April and audio and video calling in the mobile apps in May.
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.
Brosix vs Slack: editorial side-by-side
Brosix
2.5COMMS
Brosix 6.0 redesigns the 20-year-old messenger and upgrades calls and search.
◆ Current state
Brosix is a 20-year-old team messenger. Version 6.0 brings a redesigned interface, clearer calls, better search and more consistent behaviour across desktop and mobile. It follows private channels and communities for clients and partners in April and audio and video calling in the mobile apps in May.
◆ Where it's heading
After a summer of referral campaigns and how-to posts, Brosix has shipped its largest release in years, modernising the client rather than changing what the product does. The April communities launch remains the one move that widened its scope beyond internal team chat.
◆ Prediction
Expect 6.0 follow-up posts and fixes as users move to the new client; the entries do not show a further change of direction.
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.
Alternatives to Brosix and Slack
Other Comms 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 Brosix or Slack.
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.
See all Brosix alternatives → · See all Slack alternatives →
Recent activity from Brosix 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
- 9d agoBrosixBrosix 6.0 redesigns the app with better calls and search
- 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
- 4mo agoBrosixSummer Referral Campaign 2026: Earn 3 Free Months for Every Team You Bring to Brosix
- 4mo agoBrosixHow to set up IT and HR distribution groups with private rooms
- 5mo agoBrosixBrosix Turns 20: Two Decades of Keeping Team Communication Simple
- 6mo agoBrosixAudio and Video Calls Are Now Available on Brosix Mobile Apps
- 7mo agoBrosixNew in Brosix: Build Private Channels and Communities — for Teams, Clients, and Partners ⚡
Frequently asked questions
What is the difference between Brosix and Slack?
They serve adjacent needs but don't currently overlap on shipped themes. Slack is currently shipping more aggressively (velocity 6.3 vs 2.5), 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 Brosix 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 2.5), with 1 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to Brosix?
Top Brosix alternatives in Comms are ranked by recent ship velocity. Browse the "Brosix alternatives" section above for the current picks, or visit /alternatives/brosix for the full list with editorial commentary on each.
What are the best alternatives to Slack?
Top Slack alternatives in Comms 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.