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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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Duolingo Max
A
Hume AI
A
GitHub Copilot
B
Perplexity
S
TaglineDuolingo + AI. Explain My Answer + Roleplay features.Voice AI that reads + expresses emotion.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI search done right. Cited answers, not chat theater.
Categoryeducationvoicecodingresearch
Pricing$30/mo (or ~$168/yr)Free tier + pay-as-you-goFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Pro
Best forLanguage learners who've outgrown basic Duolingo.Therapy apps, customer service, any voice agent where emotion matters.Teams with GitHub already. Devs who don't want to change IDEs.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Niche use case
  • Pricing ramps fast
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.A-tier in its niche. The only one that actually gets emotion right.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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