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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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OpenRouter
S
Replit Agent
A
Devin
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Replit's AI that builds + deploys full apps on their platform.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformCodingAgents
PricingPay per token — model-dependent$10-$25/mo Core/Teams$500/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Teachers, students, prototypers, hackathon builders.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. Best for teaching a kid to code in 2026.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
LinkOpen →Open →Open →