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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
S
Bolt.new (StackBlitz)
A
GitHub Copilot
B
Lex
A
TaglineAI search done right. Cited answers, not chat theater.Prompt to deployed full-stack app in the browser.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Google Docs with an AI collaborator baked in.
Categoryresearchcodingcodingwriting
PricingFree + $20/mo ProFree + $20-$200/moFree (limited) + $10/mo Pro + $19/mo BusinessFree + $12/mo
Best forReplacing Google for any question where you want a cited answer in seconds.PMs, founders, non-devs shipping MVPs.Teams with GitHub already. Devs who don't want to change IDEs.Essays, long-form drafts, thinking on the page.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
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. Best for fast prototypes. Competitive with Lovable — try both.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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