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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
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NotebookLM
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Cursor
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TaglineAI search done right. Cited answers, not chat theater.Google's research notebook. Turns your docs into a podcast.VS Code fork that made AI coding actually work.
Categoryresearchresearchcoding
PricingFree + $20/mo ProFreeFree + $20/mo Pro + $40/mo Business
Best forReplacing Google for any question where you want a cited answer in seconds.Students, researchers, anyone with a stack of PDFs or a topic to learn.Developers. Non-developers who want to ship working code.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Google-only
  • Can be slow on large corpora
  • Can feel overwhelming for non-coders
  • Expensive at scale
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 for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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