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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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Grammarly
A
Duolingo Max
A
Claude Code
S
Hume AI
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Duolingo + AI. Explain My Answer + Roleplay features.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Voice AI that reads + expresses emotion.
CategoryWritingEducationCodingVoice
PricingFree + $12-$15/mo Premium + team plans$30/mo (or ~$168/yr)Part of Claude Pro/Max/Team plansFree tier + pay-as-you-go
Best forNon-native English writers, business email, anyone who types a lot.Language learners who've outgrown basic Duolingo.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Therapy apps, customer service, any voice agent where emotion matters.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Niche use case
  • Pricing ramps fast
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier in its niche. The only one that actually gets emotion right.
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