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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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Devin
A
Duolingo Max
A
TaglineRun any open-source AI model with an API call.Cognition Labs' autonomous coding engineer.Duolingo + AI. Explain My Answer + Roleplay features.
CategoryDev PlatformAgentsEducation
PricingPay per second of compute$500/mo$30/mo (or ~$168/yr)
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Engineering teams offloading tickets. Ops/platform work.Language learners who've outgrown basic Duolingo.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.
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