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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
Figma AI
A
Hex
A
TaglineRun any open-source AI model with an API call.AI writing tool built specifically for fiction writers.AI features baked into the design tool you already use.Modern data notebook with Magic AI assistant.
CategoryDev PlatformWritingDesignData
PricingPay per second of compute$19-$59/moIncluded with Figma plansFree + $28+/user/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Novelists, screenwriters, fiction short-form writers.Designers already on Figma.Data teams at startups + enterprises.
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
  • First drafts with Make Designs
  • Rename/rearrange layers automatically
  • Natural language asset search
  • SQL + Python + no-code in one notebook
  • Magic AI writes queries + viz for you
  • Team-grade collaboration
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Features vary by plan + region
  • Still rolling out
  • Overkill for casual users
  • Enterprise pricing
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. No reason not to use it if you're on Figma. Not worth switching for.A-tier for data teams. S-tier if you already live in SQL + Python.
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