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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
Gamma
A
Lex
A
TaglineRun any open-source AI model with an API call.AI slide decks that don't look AI-generated.Google Docs with an AI collaborator baked in.
Categorydev platformproductivitywriting
PricingPay per second of computeFree + $10-$20/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Pitch decks, proposals, internal presentations — fast.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Strong templates
  • Decks, docs, webpages
  • Doesn't look generic
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Locked into Gamma's format
  • Export quality varies
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Best of a boring category. Use it for first drafts, then edit in Keynote if high-stakes.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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