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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
Aider
A
Bolt.new (StackBlitz)
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Terminal-based AI pair programmer. Git-aware, model-flexible.Prompt to deployed full-stack app in the browser.
CategoryDev PlatformCodingCoding
PricingPay per token — model-dependentFree (open source) + whatever API you useFree + $20-$200/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Developers who want open-source tooling with full control.PMs, founders, non-devs shipping MVPs.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
LinkOpen →Open →Open →