Rspamd
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Comparison · Collab
Slack vs WhatsApp
A side-by-side editorial comparison of Slack and WhatsApp — release velocity, themes, recent moves, and the top alternatives to consider.
Slack vs WhatsApp: at a glance
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.
What is WhatsApp?
WhatsApp is defining who owns a business conversation when several partners share one account.
The first new surface since April is Conversation Routing, documented on September 23, which controls which partner receives inbound messages on a shared account. It covers thread ownership, standby partners, and an AI-generated conversation summary delivered on handover. Follow-up changes are small: a request_id on thread control calls and error 131070 for apps sending without ownership.
Slack vs WhatsApp: editorial side-by-side
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.
WhatsApp
2.5COLLAB
WhatsApp is defining who owns a business conversation when several partners share one account.
◆ Current state
The first new surface since April is Conversation Routing, documented on September 23, which controls which partner receives inbound messages on a shared account. It covers thread ownership, standby partners, and an AI-generated conversation summary delivered on handover. Follow-up changes are small: a request_id on thread control calls and error 131070 for apps sending without ownership.
◆ Where it's heading
The API focus has moved from marketing creative controls to multi-partner operations. Thread control, escalation partners and handover summaries assume a business running several vendors or agents on one number. The new terms requirement for standby, escalation and thread control ties these features to acceptance of the Meta Business Agents and Platform Terms of Service.
◆ Prediction
Expect continued Conversation Routing refinement, since each update since launch has tightened thread control. The entries do not show when or whether the April creative-optimization work resumes.
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.
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.
WhatsApp alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with WhatsApp.
Interact
Interact opens its intranet to outside AI assistants and uses Claude to attack its own platform.
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.
Recent activity from Slack and WhatsApp
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
- 1mo agoWhatsAppConversation Routing: error 131070 and terms prerequisite
- 1mo agoWhatsAppThread control calls now return a request_id
- 1mo agoWhatsAppConversation Routing for accounts shared by several partners
- 6mo agoWhatsAppMarketing Messages: creative optimization off by default
- 6mo agoWhatsAppMarketing Messages: more offsite conversion metrics
- 7mo agoWhatsAppCloud API: error code 131064 added
Frequently asked questions
What is the difference between Slack and WhatsApp?
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 Slack better than WhatsApp?
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 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 WhatsApp?
Top WhatsApp alternatives in Collab are ranked by recent ship velocity. Browse the "WhatsApp alternatives" section above for the current picks, or visit /alternatives/whatsapp for the full list with editorial commentary on each.