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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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Devin
A
Lovable
A
Claude
S
Perplexity
S
TaglineCognition Labs' autonomous coding engineer.Build a full app from a prompt. Stripe-ready.Anthropic's flagship — best reasoning + longest useful context.AI search done right. Cited answers, not chat theater.
CategoryAgentsDesignChatbotsResearch
Pricing$500/moFree + $25-$100/moFree + $20/mo Pro + team/enterpriseFree + $20/mo Pro
Best forEngineering teams offloading tickets. Ops/platform work.Non-devs + solopreneurs shipping MVPs.Long writing, code, careful thinking, documents over 50 pages.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Generates full apps + DB + auth
  • Good for non-developers
  • Ships faster than hand-coding
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Complexity ceiling
  • Can generate brittle code
  • Image generation is weak
  • No native web search on all tiers
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. The strongest 'no-code' AI builder right now. Great for founder MVPs.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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