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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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Perplexity
S
Claude Code
S
Grammarly
A
Lex
A
TaglineAI search done right. Cited answers, not chat theater.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Grammar check + tone + AI drafting, everywhere you type.Google Docs with an AI collaborator baked in.
Categoryresearchcodingwritingwriting
PricingFree + $20/mo ProPart of Claude Pro/Max/Team plansFree + $12-$15/mo Premium + team plansFree + $12/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Non-native English writers, business email, anyone who types a lot.Essays, long-form drafts, thinking on the page.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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