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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
A
Reflect
A
Rows
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Devin
A
TaglineGoogle Docs with an AI collaborator baked in.AI-powered networked notes. Roam with a brain.Spreadsheets with AI + live integrations baked in.Cognition Labs' autonomous coding engineer.
CategoryWritingProductivityDataAgents
PricingFree + $12/mo$10/moFree + $19-$89/user/mo$500/mo
Best forEssays, long-form drafts, thinking on the page.Knowledge workers + thinkers who want AI in their second brain.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
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • 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
  • Expensive for just notes
  • Smaller community than Obsidian
  • 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.A-tier. Niche but beloved. If you've outgrown Notion, try this.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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