KaiAI tutor for anyone

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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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TaglineGoogle Docs with an AI collaborator baked in.Open-source VS Code agent. Reads + writes + runs.
CategoryWritingCoding
PricingFree + $12/moFree (open source) + your API costs
Best forEssays, long-form drafts, thinking on the page.VS Code users who want agentic coding without changing IDEs.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can burn tokens fast if not watched
  • Less polished than Cursor
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Best free agentic option in VS Code. Use with Claude for best results.
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