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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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Bolt.new (StackBlitz)
A
Devin
A
TaglinePrompt to deployed full-stack app in the browser.Cognition Labs' autonomous coding engineer.
CategoryCodingAgents
PricingFree + $20-$200/mo$500/mo
Best forPMs, founders, non-devs shipping MVPs.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictA-tier. Best for fast prototypes. Competitive with Lovable — try both.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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