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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
Perplexity
S
Replit Agent
A
Hex
A
TaglineCognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.Replit's AI that builds + deploys full apps on their platform.Modern data notebook with Magic AI assistant.
CategoryAgentsResearchCodingData
Pricing$500/moFree + $20/mo Pro$10-$25/mo Core/TeamsFree + $28+/user/mo
Best forEngineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.Teachers, students, prototypers, hackathon builders.Data teams at startups + enterprises.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • SQL + Python + no-code in one notebook
  • Magic AI writes queries + viz for you
  • Team-grade collaboration
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Overkill for casual users
  • Enterprise pricing
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Best for teaching a kid to code in 2026.A-tier for data teams. S-tier if you already live in SQL + Python.
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