Rspamd
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Comparison · Comms
Slack vs Subsplash
A side-by-side editorial comparison of Slack and Subsplash — release velocity, themes, recent moves, and the top alternatives to consider.
Slack vs Subsplash: at a glance
| Feature | Slack | Subsplash |
|---|---|---|
| Sector | Comms, Collab | Comms |
| Velocity score | 6.3 | 5.0 |
| Sparks · 30d | 1 | 0 |
| Top themes | agents, a2a, mcp, slackbot-skills | church-platform, giving-management, integrations, people-management |
| Last editorial update | 3d ago | 2d ago |
| Website | Visit → | — |
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 Subsplash?
Subsplash Giving now syncs donations and people with Planning Center.
Subsplash runs giving, media, people and workflow tools for churches. In November it made Dashboard Home a single view across all its products, then on 10 November connected Subsplash Giving to Planning Center: transactions sync one way on a schedule or on demand, profiles sync both ways, funds are mapped, and each sync produces a report with flagged items staff can fix themselves.
Slack vs Subsplash: 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.
Subsplash
5.0COMMS
Subsplash Giving now syncs donations and people with Planning Center.
◆ Current state
Subsplash runs giving, media, people and workflow tools for churches. In November it made Dashboard Home a single view across all its products, then on 10 November connected Subsplash Giving to Planning Center: transactions sync one way on a schedule or on demand, profiles sync both ways, funds are mapped, and each sync produces a report with flagged items staff can fix themselves.
◆ Where it's heading
Recent work focuses on the church office's admin load: notes, multi-select, reconciliation, a unified home page, and now integration with the people database many churches already use. Subsplash is positioning Giving to work alongside Planning Center rather than requiring churches to replace it.
◆ Prediction
Further Planning Center links, such as events or groups, are plausible, but the entries do not indicate which comes next.
Alternatives to Slack and Subsplash
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 Slack or Subsplash.
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 Slack alternatives → · See all Subsplash alternatives →
Recent activity from Slack and Subsplash
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 3d agoSubsplashPlanning Center Integration
- 4d agoSlackBring your A2A agents to Slack ⚡
- 8d agoSlackWork Objects embeds require the slack-mcps.com frame ancestor
- 9d agoSubsplashDashboard Home now covers every Subsplash product
- 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
- 14d agoSubsplashPeople Multi-Select
- 15d agoSlackSlack CLI 4.12.0, the fourth CLI release in October
- 1mo agoSubsplashGift totals and recurring status in Giving
- 1mo agoSubsplashNotes on People
- 1mo agoSubsplashShare links that start a video at the current timestamp
Frequently asked questions
What is the difference between Slack and Subsplash?
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 Slack better than Subsplash?
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 Comms products to evaluate alongside.
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.
What are the best alternatives to Subsplash?
Top Subsplash alternatives in Comms are ranked by recent ship velocity. Browse the "Subsplash alternatives" section above for the current picks, or visit /alternatives/subsplash for the full list with editorial commentary on each.