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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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v0
S
OpenRouter
S
Gemini
A
TaglineVercel's AI-powered UI generator. Prompt to shadcn component.One API, every model. Pay-as-you-go, no subscriptions.Google's answer. Best integrated with Workspace + free for a lot.
CategoryDesignDev PlatformChatbots
PricingFree + $20/moPay per token — model-dependentFree + $20/mo Advanced (bundled with 2TB Drive)
Best forFrontend devs, PMs prototyping UIs, anyone on Next.js.Developers experimenting across models. Apps that want fallback logic.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Best for shadcn stack
  • Iterating can be fiddly
  • Slight markup over direct API
  • Some provider features not exposed
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-tier. If you're on Vercel/shadcn, this is cheating.S-tier for model-shopping. I use this for every prototype before committing.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
LinkOpen →Open →Open →