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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
v0
S
Claude Code
S
Leonardo.ai
A
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.Vercel's AI-powered UI generator. Prompt to shadcn component.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Gamer + creator image gen with model fine-tuning built in.
CategoryCodingDesignCodingImage
PricingFree (open source) + whatever API you useFree + $20/moPart of Claude Pro/Max/Team plansFree + $12-$60/mo
Best forDevelopers who want open-source tooling with full control.Frontend devs, PMs prototyping UIs, anyone on Next.js.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Indie game devs, illustrators, anyone training custom style models.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • 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
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Best for shadcn stack
  • Iterating can be fiddly
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • General output behind Midjourney
  • Can be overwhelming
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.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.A-tier for creators training custom looks. B-tier for general use.
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