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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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Chatbots
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Agents
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Data
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Perplexity
S
Lex
A
Runway
S
TaglineAI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.The pro's AI video tool. Gen-4 is the current bar.
CategoryResearchWritingVideo
PricingFree + $20/mo ProFree + $12/moFree + $15-$95/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.Marketing video, pitch decks, b-roll, creative shorts.
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
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Expensive at scale
  • Still needs post-editing
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. Market leader with reason. Start here for serious video.
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