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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
Lex
A
Perplexity
S
Sudowrite
S
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.AI writing tool built specifically for fiction writers.
CategoryDev PlatformWritingResearchWriting
PricingPay per second of computeFree + $12/moFree + $20/mo Pro$19-$59/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Novelists, screenwriters, fiction short-form writers.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Pricey for casual use
  • Fiction-only focus — not for business writing
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.
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