COMMS
Fonoster now cleans up deleted workspaces and stops exposing stored secrets.
Alternatives · team communication tools
Slack alternatives
The best Slack alternatives in team communication tools, ranked by Sparkpulse's velocity_score.
Updated Nov 14, 2026
Looking for the best alternatives to Slack? Sparkpulse tracks and ranks 12 alternatives in team communication tools by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Slack shipped 1 meaningful update in the last 30 days and carries a velocity score of 6.3 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About 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.
Velocity 6.3 · Last update 3d ago
Top 12 alternatives to Slack
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
SUPPORT
Twilio's voice AI stops cutting callers off mid-sentence, using its own turn-taking model.
COMMS
Salesmsg adds call-back requests and a one-click Emergency Stop for all outbound texts.
COMMS
Rocket.Chat 9.0 reaches rc.8 with a migration fix as candidates shrink to single patches.
COMMS
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
COMMS
Element 1.12.35 follows the call picture-in-picture release with one desktop storage fix.
COMMS
Krisp moves call transcripts and live captions to cloud transcription in KrispCX 2.84.4.
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Misskey 2026.11 ships: a leaner start script, and Node.js 22 no longer boots.
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SlickText's feed is all SMS buying guides; no product release has surfaced since RCS.
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Session ships new app versions and node upgrades while Pro stays on hold.
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Signal Desktop's 8.36 beta adds favorite sticker packs after a fix-only week.
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Superhuman's MCP now lets Claude and ChatGPT attach files, set reminders and share threads.
Slack vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Slack (baseline) | 6.3 | 1 | agentsa2amcp | Bring your A2A agents to Slack |
| Fonoster | 7.5 | 0 | programmable-voicevoice-aibilling | — |
| Twilio | 6.3 | 1 | voice-aimessagingcaller trust | General Availability: Smart Turn Detection for Conversation Relay |
| Salesmsg | 6.3 | 1 | business-textingai-agentscalling | Sherpa AI sends messages and builds broadcasts on request |
| Rocket.Chat | 6.3 | 0 | team-chatlicensingself-hosted | — |
| Rspamd | 5.0 | 0 | spam filteringemail authenticationinput hardening | — |
| Element | 5.0 | 0 | encryptionrecovery-keysmodule-api | — |
| Krisp | 5.0 | 0 | call-center-aitranscriptionvoice-translation | — |
| Misskey | 5.0 | 0 | fediverseself-hostingmemory usage | — |
| SlickText | 5.0 | 0 | smscontent-seopricing | — |
| Session | 5.0 | 0 | private messagingpost-quantumsession pro | — |
| Signal Desktop | 5.0 | 0 | beta-channelmobile-parityinbox-organization | — |
| Superhuman | 5.0 | 0 | emailmcpai assistant | — |
The 12 best Slack alternatives, in depth
1. Fonoster · velocity 7.5
Fonoster now cleans up deleted workspaces and stops exposing stored secrets.
Over the last 30 days Fonoster shipped 0 meaningful updates vs Slack's 1. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Fonoster focuses on programmable voice, voice ai and billing.
Fonoster has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
2. Twilio · velocity 6.3
Twilio's voice AI stops cutting callers off mid-sentence, using its own turn-taking model.
Over the last 30 days Twilio shipped 1 meaningful update vs Slack's 1, most recently “General Availability: Smart Turn Detection for Conversation Relay”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Twilio focuses on voice ai, messaging and caller trust.
Twilio and Slack have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
3. Salesmsg · velocity 6.3
Salesmsg adds call-back requests and a one-click Emergency Stop for all outbound texts.
Over the last 30 days Salesmsg shipped 1 meaningful update vs Slack's 1, most recently “Sherpa AI sends messages and builds broadcasts on request”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Salesmsg focuses on business texting, ai agents and calling.
Salesmsg and Slack have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
4. Rocket.Chat · velocity 6.3
Rocket.Chat 9.0 reaches rc.8 with a migration fix as candidates shrink to single patches.
Over the last 30 days Rocket.Chat shipped 0 meaningful updates vs Slack's 1. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Rocket.Chat focuses on team chat, licensing and self hosted.
Rocket.Chat has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
Full Rocket.Chat trajectory → · Compare Slack vs Rocket.Chat →
5. Rspamd · velocity 5.0
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Over the last 30 days Rspamd shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Rspamd focuses on spam filtering, email authentication and input hardening.
Rspamd has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
6. Element · velocity 5.0
Element 1.12.35 follows the call picture-in-picture release with one desktop storage fix.
Over the last 30 days Element shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Element focuses on encryption, recovery keys and module api.
Element has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
7. Krisp · velocity 5.0
Krisp moves call transcripts and live captions to cloud transcription in KrispCX 2.84.4.
Over the last 30 days Krisp shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Krisp focuses on call center ai, transcription and voice translation.
Krisp has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
8. Misskey · velocity 5.0
Misskey 2026.11 ships: a leaner start script, and Node.js 22 no longer boots.
Over the last 30 days Misskey shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Misskey focuses on fediverse, self hosting and memory usage.
Misskey has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
9. SlickText · velocity 5.0
SlickText's feed is all SMS buying guides; no product release has surfaced since RCS.
Over the last 30 days SlickText shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, SlickText focuses on sms, content seo and pricing.
SlickText has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
10. Session · velocity 5.0
Session ships new app versions and node upgrades while Pro stays on hold.
Over the last 30 days Session shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Session focuses on private messaging, post quantum and session pro.
Session has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
11. Signal Desktop · velocity 5.0
Signal Desktop's 8.36 beta adds favorite sticker packs after a fix-only week.
Over the last 30 days Signal Desktop shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Signal Desktop focuses on beta channel, mobile parity and inbox organization.
Signal Desktop has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
Full Signal Desktop trajectory → · Compare Slack vs Signal Desktop →
12. Superhuman · velocity 5.0
Superhuman's MCP now lets Claude and ChatGPT attach files, set reminders and share threads.
Over the last 30 days Superhuman shipped 0 meaningful updates vs Slack's 1. Its velocity score of 5.0/10 blends that with longer-term release cadence.
Where Slack leans on agents, a2a and mcp, Superhuman focuses on email, mcp and ai assistant.
Superhuman has shipped fewer meaningful updates than Slack in the last 30 days, so weigh it on fit and feature depth rather than recent pace.
Full Superhuman trajectory → · Compare Slack vs Superhuman →
Frequently asked questions
What are the best alternatives to Slack?
The top Slack alternatives we currently track in team communication tools are Fonoster, Twilio, Salesmsg, Rocket.Chat, Rspamd, ranked by recent ship velocity.
How is this list of Slack alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Slack directly with one of these alternatives?
Yes — every card has a "Compare with Slack" link to a side-by-side /compare page.