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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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GitHub Copilot
B
Replicate
S
Duolingo Max
A
Devin
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Run any open-source AI model with an API call.Duolingo + AI. Explain My Answer + Roleplay features.Cognition Labs' autonomous coding engineer.
Categorycodingdev platformeducationagents
PricingFree (limited) + $10/mo Pro + $19/mo BusinessPay per second of compute$30/mo (or ~$168/yr)$500/mo
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers using open-source models (Flux, SDXL, Whisper, etc).Language learners who've outgrown basic Duolingo.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for open-source model APIs. The default in this space.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
LinkOpen →Open →Open →Open →