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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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Replit Agent
A
Kling
A
Devin
A
Perplexity
S
TaglineReplit's AI that builds + deploys full apps on their platform.Kuaishou's video model. The surprise standout.Cognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.
CategoryCodingVideoAgentsResearch
Pricing$10-$25/mo Core/TeamsCredit-based, free trial$500/moFree + $20/mo Pro
Best forTeachers, students, prototypers, hackathon builders.Anyone who wants top-tier video quality for less.Engineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • 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
Weaknesses
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • UX is rough for English speakers
  • Queue times
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. Best for teaching a kid to code in 2026.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.A-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.
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