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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
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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.Autonomous AI agent that actually finishes tasks.
CategoryResearchCodingWritingAgents
PricingFree + $20/mo ProFree + $20/mo Pro + $40/mo BusinessFree + $12/moFree tier + $39-$199/mo
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.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.
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
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
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
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
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 in the agent category. The first one I'd give to a non-technical friend.
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