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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
DeepSeek
S
TaglineGoogle Docs with an AI collaborator baked in.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
Categorywritingchat
PricingFree + $12/moFree web + ultra-cheap API (~$0.14/M input tokens)
Best forEssays, long-form drafts, thinking on the page.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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