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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
Aider
A
Cursor
S
Bolt.new (StackBlitz)
A
TaglineGrammar check + tone + AI drafting, everywhere you type.Terminal-based AI pair programmer. Git-aware, model-flexible.VS Code fork that made AI coding actually work.Prompt to deployed full-stack app in the browser.
CategoryWritingCodingCodingCoding
PricingFree + $12-$15/mo Premium + team plansFree (open source) + whatever API you useFree + $20/mo Pro + $40/mo BusinessFree + $20-$200/mo
Best forNon-native English writers, business email, anyone who types a lot.Developers who want open-source tooling with full control.Developers. Non-developers who want to ship working code.PMs, founders, non-devs shipping MVPs.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
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