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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
Ollama
S
Devin
A
TaglineAI search done right. Cited answers, not chat theater.Terminal-based AI pair programmer. Git-aware, model-flexible.Run LLMs locally. One-line install, GUI optional.Cognition Labs' autonomous coding engineer.
CategoryResearchCodingDev PlatformAgents
PricingFree + $20/mo ProFree (open source) + whatever API you useFree + open source$500/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Developers who want open-source tooling with full control.Devs wanting offline/local LLMs for privacy or experimentation.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier for local inference. If you care about privacy or want to tinker, install this today.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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