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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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v0
S
Gemini
A
GitHub Copilot
B
Devin
A
TaglineVercel's AI-powered UI generator. Prompt to shadcn component.Google's answer. Best integrated with Workspace + free for a lot.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Cognition Labs' autonomous coding engineer.
Categorydesignchatcodingagents
PricingFree + $20/moFree + $20/mo Advanced (bundled with 2TB Drive)Free (limited) + $10/mo Pro + $19/mo Business$500/mo
Best forFrontend devs, PMs prototyping UIs, anyone on Next.js.Anyone already on Google, research tasks, summarizing long documents.Teams with GitHub already. Devs who don't want to change IDEs.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Best for shadcn stack
  • Iterating can be fiddly
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier. If you're on Vercel/shadcn, this is cheating.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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