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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
Ollama
S
GitHub Copilot
B
Lex
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Run LLMs locally. One-line install, GUI optional.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Google Docs with an AI collaborator baked in.
Categorywritingdev platformcodingwriting
PricingFree + $12-$15/mo Premium + team plansFree + open sourceFree (limited) + $10/mo Pro + $19/mo BusinessFree + $12/mo
Best forNon-native English writers, business email, anyone who types a lot.Devs wanting offline/local LLMs for privacy or experimentation.Teams with GitHub already. Devs who don't want to change IDEs.Essays, long-form drafts, thinking on the page.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
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 local inference. If you care about privacy or want to tinker, install this today.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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