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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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Dev Platform
Agents
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Video
Audio
Research
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Image
Meetings
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Productivity
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Perplexity
S
Lex
A
Fathom
S
Khanmigo
S
TaglineAI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.Meeting notes, free forever for individuals.Khan Academy's AI tutor. Socratic method, built for learning.
CategoryResearchWritingMeetingsEducation
PricingFree + $20/mo ProFree + $12/moFree for individuals + $15-$29/user/mo teams$4/mo (free for teachers)
Best forReplacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.Solo operators, freelancers, small teams on a budget.Students K-12. Parents helping with homework. Teachers prepping lessons.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Socratic — doesn't give answers, asks questions
  • Trusted by schools + parents
  • Integrated with Khan Academy curriculum
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Bot-joining model
  • Team features gated
  • K-12 focus (not deep for adults)
  • Slower than general chatbots
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for solo + free. The best free option, hands down.S-tier for kids learning. The tutoring UX is legit — not a generic chatbot dressed up.
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