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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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Replicate
S
Sudowrite
S
Gemini
A
Lex
A
TaglineRun any open-source AI model with an API call.AI writing tool built specifically for fiction writers.Google's answer. Best integrated with Workspace + free for a lot.Google Docs with an AI collaborator baked in.
CategoryDev PlatformWritingChatbotsWriting
PricingPay per second of compute$19-$59/moFree + $20/mo Advanced (bundled with 2TB Drive)Free + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Novelists, screenwriters, fiction short-form writers.Anyone already on Google, research tasks, summarizing long documents.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
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • 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
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • 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.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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