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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
GitHub Copilot
B
Hume AI
A
Claude Code
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Voice AI that reads + expresses emotion.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
Categorywritingcodingvoicecoding
PricingFree + $12-$15/mo Premium + team plansFree (limited) + $10/mo Pro + $19/mo BusinessFree tier + pay-as-you-goPart of Claude Pro/Max/Team plans
Best forNon-native English writers, business email, anyone who types a lot.Teams with GitHub already. Devs who don't want to change IDEs.Therapy apps, customer service, any voice agent where emotion matters.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Niche use case
  • Pricing ramps fast
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
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 for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier in its niche. The only one that actually gets emotion right.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
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