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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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GitHub Copilot
B
Cline
A
Grammarly
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Open-source VS Code agent. Reads + writes + runs.Grammar check + tone + AI drafting, everywhere you type.
Categorycodingcodingwriting
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree (open source) + your API costsFree + $12-$15/mo Premium + team plans
Best forTeams with GitHub already. Devs who don't want to change IDEs.VS Code users who want agentic coding without changing IDEs.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Best free agentic option in VS Code. Use with Claude for best results.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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