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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
Cursor
S
Devin
A
DeepSeek
S
TaglineReplit's AI that builds + deploys full apps on their platform.VS Code fork that made AI coding actually work.Cognition Labs' autonomous coding engineer.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
Categorycodingcodingagentschat
Pricing$10-$25/mo Core/TeamsFree + $20/mo Pro + $40/mo Business$500/moFree web + ultra-cheap API (~$0.14/M input tokens)
Best forTeachers, students, prototypers, hackathon builders.Developers. Non-developers who want to ship working code.Engineering teams offloading tickets. Ops/platform work.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictA-tier. Best for teaching a kid to code in 2026.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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