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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
Kling
A
Replicate
S
TaglineGoogle Docs with an AI collaborator baked in.Kuaishou's video model. The surprise standout.Run any open-source AI model with an API call.
CategoryWritingVideoDev Platform
PricingFree + $12/moCredit-based, free trialPay per second of compute
Best forEssays, long-form drafts, thinking on the page.Anyone who wants top-tier video quality for less.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • UX is rough for English speakers
  • Queue times
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for open-source model APIs. The default in this space.
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