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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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S
Lex
A
Windsurf
A
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.Codeium's agentic IDE. Cascade agent + strong free tier.
Categorydev platformwritingcoding
PricingPay per second of computeFree + $12/moFree + $15/mo Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Developers who want Cursor-like power for less money.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Smaller community
  • Model selection more limited
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Close second to Cursor. If $5/mo matters, start here.
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