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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
Perplexity
S
Writesonic
B
Cline
A
TaglineGrammar check + tone + AI drafting, everywhere you type.AI search done right. Cited answers, not chat theater.SEO-first AI writer. Optimized for ranking content.Open-source VS Code agent. Reads + writes + runs.
CategoryWritingResearchMarketingCoding
PricingFree + $12-$15/mo Premium + team plansFree + $20/mo ProFree + $15-$99/moFree (open source) + your API costs
Best forNon-native English writers, business email, anyone who types a lot.Replacing Google for any question where you want a cited answer in seconds.Content marketers churning out SEO articles.VS Code users who want agentic coding without changing IDEs.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Can burn tokens fast if not watched
  • Less polished than Cursor
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 search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.A-tier. Best free agentic option in VS Code. Use with Claude for best results.
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