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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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S
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S
Lex
A
Claude Agent SDK
S
TaglineAI search done right. Cited answers, not chat theater.VS Code fork that made AI coding actually work.Google Docs with an AI collaborator baked in.Anthropic's SDK for building your own agents on Claude.
CategoryResearchCodingWritingAgents
PricingFree + $20/mo ProFree + $20/mo Pro + $40/mo BusinessFree + $12/moAPI usage + SDK is free
Best forReplacing Google for any question where you want a cited answer in seconds.Developers. Non-developers who want to ship working code.Essays, long-form drafts, thinking on the page.Developers building custom agents for their own company/product.
Strengths
  • 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
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Developer-only
  • You build the UI
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 coding. If you write code of any kind, this pays back the $20 in a day.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for builders. The right primitives. What Kai is built on under the hood.
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