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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
Writesonic
B
Cursor
S
TaglineGrammar check + tone + AI drafting, everywhere you type.SEO-first AI writer. Optimized for ranking content.VS Code fork that made AI coding actually work.
CategoryWritingMarketingCoding
PricingFree + $12-$15/mo Premium + team plansFree + $15-$99/moFree + $20/mo Pro + $40/mo Business
Best forNon-native English writers, business email, anyone who types a lot.Content marketers churning out SEO articles.Developers. Non-developers who want to ship working code.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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