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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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Aider
A
OpenRouter
S
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.One API, every model. Pay-as-you-go, no subscriptions.
Categorycodingdev platform
PricingFree (open source) + whatever API you usePay per token — model-dependent
Best forDevelopers who want open-source tooling with full control.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →