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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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Dev Platform
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Replicate
S
Runway
S
v0
S
Google Veo
A
TaglineRun any open-source AI model with an API call.The pro's AI video tool. Gen-4 is the current bar.Vercel's AI-powered UI generator. Prompt to shadcn component.Google's video model. Baked into Gemini + YouTube Shorts.
CategoryDev PlatformVideoDesignVideo
PricingPay per second of computeFree + $15-$95/moFree + $20/moIncluded with Gemini Advanced $20/mo + YouTube creator tools
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Marketing video, pitch decks, b-roll, creative shorts.Frontend devs, PMs prototyping UIs, anyone on Next.js.Gemini Advanced users, YouTube Shorts creators.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
  • Included with Gemini Advanced
  • YouTube Shorts native integration
  • Strong prompt understanding
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive at scale
  • Still needs post-editing
  • Best for shadcn stack
  • Iterating can be fiddly
  • Still catching up on quality vs Kling/Runway
  • Less control than pros need
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier. Market leader with reason. Start here for serious video.S-tier. If you're on Vercel/shadcn, this is cheating.A-tier if you already pay Gemini. B-tier standalone.
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