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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
Claude Agent SDK
S
GitHub Copilot
B
TaglineGrammar check + tone + AI drafting, everywhere you type.Anthropic's SDK for building your own agents on Claude.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.
Categorywritingagentscoding
PricingFree + $12-$15/mo Premium + team plansAPI usage + SDK is freeFree (limited) + $10/mo Pro + $19/mo Business
Best forNon-native English writers, business email, anyone who types a lot.Developers building custom agents for their own company/product.Teams with GitHub already. Devs who don't want to change IDEs.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Developer-only
  • You build the UI
  • Less agentic than Cursor/Claude Code
  • Model quality varies
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for builders. The right primitives. What Kai is built on under the hood.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.
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