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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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Aider
A
OpenRouter
S
v0
S
Claude Code
S
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.One API, every model. Pay-as-you-go, no subscriptions.Vercel's AI-powered UI generator. Prompt to shadcn component.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
CategoryCodingDev PlatformDesignCoding
PricingFree (open source) + whatever API you usePay per token — model-dependentFree + $20/moPart of Claude Pro/Max/Team plans
Best forDevelopers who want open-source tooling with full control.Developers experimenting across models. Apps that want fallback logic.Frontend devs, PMs prototyping UIs, anyone on Next.js.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Slight markup over direct API
  • Some provider features not exposed
  • Best for shadcn stack
  • Iterating can be fiddly
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier for model-shopping. I use this for every prototype before committing.S-tier. If you're on Vercel/shadcn, this is cheating.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
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