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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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Lex
A
GitHub Copilot
B
Perplexity
S
Gemini
A
TaglineGoogle Docs with an AI collaborator baked in.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI search done right. Cited answers, not chat theater.Google's answer. Best integrated with Workspace + free for a lot.
Categorywritingcodingresearchchat
PricingFree + $12/moFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo ProFree + $20/mo Advanced (bundled with 2TB Drive)
Best forEssays, long-form drafts, thinking on the page.Teams with GitHub already. Devs who don't want to change IDEs.Replacing Google for any question where you want a cited answer in seconds.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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