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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
Cursor
S
NotebookLM
S
TaglineGrammar check + tone + AI drafting, everywhere you type.AI search done right. Cited answers, not chat theater.VS Code fork that made AI coding actually work.Google's research notebook. Turns your docs into a podcast.
CategoryWritingResearchCodingResearch
PricingFree + $12-$15/mo Premium + team plansFree + $20/mo ProFree + $20/mo Pro + $40/mo BusinessFree
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.Developers. Non-developers who want to ship working code.Students, researchers, anyone with a stack of PDFs or a topic to learn.
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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Google-only
  • Can be slow on large corpora
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.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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