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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
Taskade
B
Claude Code
S
Duolingo Max
A
TaglineGrammar check + tone + AI drafting, everywhere you type.AI project management with agents for each team.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Duolingo + AI. Explain My Answer + Roleplay features.
CategoryWritingProductivityCodingEducation
PricingFree + $12-$15/mo Premium + team plansFree + $8-$20/user/moPart of Claude Pro/Max/Team plans$30/mo (or ~$168/yr)
Best forNon-native English writers, business email, anyone who types a lot.Small teams wanting AI baked into project management.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Language learners who've outgrown basic Duolingo.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Custom AI agents per project
  • Doc + tasks + kanban in one
  • Affordable for teams
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Feature sprawl
  • AI agents need tuning to be useful
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.B-tier. Solid product but crowded market. Try it if Notion AI feels too generic.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.
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