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Comparison · Collab
Readwise vs Slack
A side-by-side editorial comparison of Readwise and Slack — release velocity, themes, recent moves, and the top alternatives to consider.
Readwise vs Slack: at a glance
What is Readwise?
Two big swings in July and August, and since then Readwise has been paying the bill.
Readwise shipped a full mobile rewrite in late July and library-wide Ghostreader a fortnight later, and the weekly changelogs since have been almost entirely repair. The August 28 week is typical: thirteen fixes against five real improvements, spread across EPUB handling, chart and video embeds, Ghostreader chat on both mobile platforms, and Boox e-ink devices. The one consistent addition each week is parsing coverage for more publishers.
What is Slack?
Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
Slack's developer platform runs two tracks. The agent build-out has produced a spark roughly every two weeks since June — MCP client, a skills plugin targeting Claude Code and Cursor, and Slack Code — and now has a consolidation date attached: assistant_view is deprecated in February 2027, replaced by an Agent Sessions API. The second track is platform administration and tooling, and this window belongs to it: Marketplace submissions again require at least ten installed active workspaces, held throughout the review, after a period at a lower temporary threshold. The CLI has shipped three times since late July.
Readwise vs Slack: editorial side-by-side
Readwise
6.3COLLAB
Two big swings in July and August, and since then Readwise has been paying the bill.
◆ Current state
Readwise shipped a full mobile rewrite in late July and library-wide Ghostreader a fortnight later, and the weekly changelogs since have been almost entirely repair. The August 28 week is typical: thirteen fixes against five real improvements, spread across EPUB handling, chart and video embeds, Ghostreader chat on both mobile platforms, and Boox e-ink devices. The one consistent addition each week is parsing coverage for more publishers.
◆ Where it's heading
The fix list is a map of where the rewrite is still settling — pagination and layout stability on Android tablets, chat sheets and message sending on mobile, exports arriving with page CSS attached. Underneath that, small capabilities keep arriving quietly: Apple Books folder-EPUBs now upload, interactive charts render as linked images instead of an import notice, non-Latin titles survive the trip to Kindle. The company is broadening what it can ingest and export while stabilising what it rebuilt.
◆ Prediction
Expect the weekly cadence to hold with fixes still outnumbering additions, and the remaining Boox and Android tablet issues to keep appearing until the mobile rewrite fully settles.
Slack
6.3COMMSCOLLAB
Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
◆ Current state
Slack's developer platform runs two tracks. The agent build-out has produced a spark roughly every two weeks since June — MCP client, a skills plugin targeting Claude Code and Cursor, and Slack Code — and now has a consolidation date attached: assistant_view is deprecated in February 2027, replaced by an Agent Sessions API. The second track is platform administration and tooling, and this window belongs to it: Marketplace submissions again require at least ten installed active workspaces, held throughout the review, after a period at a lower temporary threshold. The CLI has shipped three times since late July.
◆ Where it's heading
The install requirement moving back up is a distribution decision arriving in the middle of a platform push, and the two point the same way. Slack is making it easier to build agents and harder to list one, which favours developers who already have distribution — existing workspace tools and vendors — over a new app hoping the Marketplace supplies its first users. Combined with the assistant deprecation and the Agent Sessions API, the platform is narrowing on one agent surface and one class of builder rather than widening the funnel.
◆ Prediction
The threshold is described as a return from a temporary lower bar rather than a new policy, so the open question is what replaces the Marketplace as the discovery path for an app that cannot reach ten workspaces on its own. These entries do not answer it.
Readwise alternatives
Other Collab products tracked by Sparkpulse, ranked by recent ship velocity. Tap any card for the full editorial trajectory or compare directly with Readwise.
Mattermost
Mattermost is selling sovereignty and air-gapped AI, with releases buried in the argument
Paperless-ngx
Paperless-ngx is patching hard behind a 3.1 release that made AI a workflow step
Read the Docs
Read the Docs ships a dated release every week, and this one is documentation and dependencies
Zoho Sign
Zoho Sign is clearing the exit path off Docusign while stacking up regional legal assurance
Jellyfin
Seven candidates in, 12.0 is still trading features for correctness in the metadata layer.
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.
Synapse
Synapse publishes only a changelog link, so its feed records releases without describing them
Element X Android
Element X Android ships roughly weekly, alternating real features with fix rounds
Wire
Calling is the one surface Wire's web client touches in every documented release.
Zoho Cliq
Zoho retells Cliq 7.0 as an AI story, and lets customers pick whose model tells it.
Rocket.Chat
Rocket.Chat finishes the 8.8 calling work while the licence wall for SSO gets a date.
Bandwidth
Bandwidth sells trust in the call, and self-service everywhere it used to sell tickets.
Recent activity from Readwise and Slack
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSlackUpdated installation requirement for Slack Marketplace apps
- 2d agoSlackCLI adds app-approval status checks and custom app icons
- 5d agoReadwiseApple Books EPUBs, chart embeds, and non-Latin Kindle titles
- 12d agoReadwiseAuto-scroll preference persists and Kindle disconnect works properly
- 13d agoSlackAnnouncing Slack Code ⚡
- 13d agoSlackAgent Sessions API replaces assistant_view, deprecated Feb 2027
- 19d agoReadwiseFaster manual highlight entry and steadier highlight scanning
- 26d agoReadwiseGlobal Ghostreader reads and acts across your whole library ⚡
- 1mo agoReadwiseMastery cards, Discards, and multilingual scanning restored on mobile
- 1mo agoSlackAnnouncing the Slack MCP and Skills Plugin ⚡
- 1mo agoSlackCLI adds manifest diff and a Block Kit preview command
- 1mo agoReadwiseReadwise 2.0 rebuilds the mobile apps from scratch ⚡
Frequently asked questions
What is the difference between Readwise and Slack?
They serve adjacent needs but don't currently overlap on shipped themes. Readwise and Slack are shipping at a similar cadence (velocity 6.3 vs 6.3, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Readwise better than Slack?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Readwise and Slack are shipping at a similar cadence (velocity 6.3 vs 6.3, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Collab products to evaluate alongside.
What are the best alternatives to Readwise?
Top Readwise alternatives in Collab are ranked by recent ship velocity. Browse the "Readwise alternatives" section above for the current picks, or visit /alternatives/readwise for the full list with editorial commentary on each.
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.