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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
Lovable
A
Runway
S
Writesonic
B
TaglineRun any open-source AI model with an API call.Build a full app from a prompt. Stripe-ready.The pro's AI video tool. Gen-4 is the current bar.SEO-first AI writer. Optimized for ranking content.
CategoryDev PlatformDesignVideoMarketing
PricingPay per second of computeFree + $25-$100/moFree + $15-$95/moFree + $15-$99/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Non-devs + solopreneurs shipping MVPs.Marketing video, pitch decks, b-roll, creative shorts.Content marketers churning out SEO articles.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Generates full apps + DB + auth
  • Good for non-developers
  • Ships faster than hand-coding
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Complexity ceiling
  • Can generate brittle code
  • Expensive at scale
  • Still needs post-editing
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. The strongest 'no-code' AI builder right now. Great for founder MVPs.S-tier. Market leader with reason. Start here for serious video.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
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