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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
Duolingo Max
A
Bolt.new (StackBlitz)
A
TaglineVS Code fork that made AI coding actually work.Duolingo + AI. Explain My Answer + Roleplay features.Prompt to deployed full-stack app in the browser.
Categorycodingeducationcoding
PricingFree + $20/mo Pro + $40/mo Business$30/mo (or ~$168/yr)Free + $20-$200/mo
Best forDevelopers. Non-developers who want to ship working code.Language learners who've outgrown basic Duolingo.PMs, founders, non-devs shipping MVPs.
Strengths
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 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
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictS-tier for coding. If you write code of any kind, this pays back the $20 in a day.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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