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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Lex
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Devin
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TaglineGoogle Docs with an AI collaborator baked in.Edit video + podcasts by editing the transcript.Spreadsheets with AI + live integrations baked in.Cognition Labs' autonomous coding engineer.
Categorywritingvideodataagents
PricingFree + $12/moFree + $16-$50/moFree + $19-$89/user/mo$500/mo
Best forEssays, long-form drafts, thinking on the page.Podcasters, course creators, anyone editing talking-head content.Ops teams, marketers, anyone building dashboards from multiple sources.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Edit audio/video by deleting text
  • Overdub (voice clone) for fixes
  • Strong collaboration + remote recording
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a traditional NLE — some workflows awkward
  • Overdub ethics require care
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for content creators. Cuts editing time in half. Non-obvious but life-changing.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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