Rspamd
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Comparison · Collab
Slack vs Syncthing
A side-by-side editorial comparison of Slack and Syncthing — release velocity, themes, recent moves, and the top alternatives to consider.
Slack vs Syncthing: 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 Syncthing?
Syncthing 2.1.7 hits a fourth release candidate as fixes move from protocol to sync logic.
Syncthing's 2.1 line added device and folder groups, HTTP CONNECT proxies, optional block indexing and configurable GUI sessions. Every tracked entry since then is a patch release candidate. 2.1.6 took four RCs, and 2.1.7 is now on rc.4, which adds sync-model fixes for metadata shortcuts, parent ownership and receive-only folders on top of rc.3's protocol validation.
Slack vs Syncthing: 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.
Syncthing
5.0COLLAB
Syncthing 2.1.7 hits a fourth release candidate as fixes move from protocol to sync logic.
◆ Current state
Syncthing's 2.1 line added device and folder groups, HTTP CONNECT proxies, optional block indexing and configurable GUI sessions. Every tracked entry since then is a patch release candidate. 2.1.6 took four RCs, and 2.1.7 is now on rc.4, which adds sync-model fixes for metadata shortcuts, parent ownership and receive-only folders on top of rc.3's protocol validation.
◆ Where it's heading
The project is stabilising the SQLite backend that came with 2.x and tightening the network protocol, and rc.4 extends that to correctness fixes in the sync model itself. Releases go through several RCs before going stable, roughly every two to three weeks.
◆ Prediction
Expect 2.1.7 stable after rc.4, followed by more 2.1.x patches on SQLite and sync correctness. The entries don't show what 2.2 will bring.
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.
Syncthing alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Syncthing.
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 Syncthing
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
- 24d agoSyncthingSyncthing 2.1.7 rc.4 fixes ownership and receive-only sync
- 27d agoSyncthingSyncthing 2.1.7 rc.3 validates incoming protocol messages
- 1mo agoSyncthingSyncthing 2.1.7 rc.2 adds discovery announcement fix
- 1mo agoSyncthingSyncthing 2.1.7 rc.1 fixes SQLite edge cases
- 1mo agoSyncthingSyncthing 2.1.6 rc.4 adds Windows logging fix
- 1mo agoSyncthingSyncthing 2.1.6 rc.3 respin
Frequently asked questions
What is the difference between Slack and Syncthing?
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 Syncthing?
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 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 Syncthing?
Top Syncthing alternatives in Collab are ranked by recent ship velocity. Browse the "Syncthing alternatives" section above for the current picks, or visit /alternatives/syncthing for the full list with editorial commentary on each.