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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
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TaglineGoogle Docs with an AI collaborator baked in.VS Code fork that made AI coding actually work.AI research assistant for academic literature.The one that actually gets text in images right.
CategoryWritingCodingResearchImage
PricingFree + $12/moFree + $20/mo Pro + $40/mo BusinessFree + $12-$42/moFree + $8/mo + $20/mo + $60/mo
Best forEssays, long-form drafts, thinking on the page.Developers. Non-developers who want to ship working code.Grad students, researchers, anyone doing literature reviews.Anything with text — posters, ads, album covers, slide decks.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Academic-only
  • Can hallucinate citations — verify everything
  • Aesthetic ceiling below Midjourney
  • Less style variety
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for academic research. Nothing else comes close for systematic reviews.S-tier for text-in-image. Use this for posters, Midjourney for art.
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