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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
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Rows
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Devin
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TaglineReplit's AI that builds + deploys full apps on their platform.Spreadsheets with AI + live integrations baked in.Cognition Labs' autonomous coding engineer.
Categorycodingdataagents
Pricing$10-$25/mo Core/TeamsFree + $19-$89/user/mo$500/mo
Best forTeachers, students, prototypers, hackathon builders.Ops teams, marketers, anyone building dashboards from multiple sources.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictA-tier. Best for teaching a kid to code in 2026.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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