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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
Claude Code
S
Duolingo Max
A
Bolt.new (StackBlitz)
A
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Duolingo + AI. Explain My Answer + Roleplay features.Prompt to deployed full-stack app in the browser.
CategoryCodingCodingEducationCoding
PricingFree (open source) + whatever API you usePart of Claude Pro/Max/Team plans$30/mo (or ~$168/yr)Free + $20-$200/mo
Best forDevelopers who want open-source tooling with full control.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Language learners who've outgrown basic Duolingo.PMs, founders, non-devs shipping MVPs.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
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