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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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Devin
A
Ollama
S
Aider
A
Bolt.new (StackBlitz)
A
TaglineCognition Labs' autonomous coding engineer.Run LLMs locally. One-line install, GUI optional.Terminal-based AI pair programmer. Git-aware, model-flexible.Prompt to deployed full-stack app in the browser.
CategoryAgentsDev PlatformCodingCoding
Pricing$500/moFree + open sourceFree (open source) + whatever API you useFree + $20-$200/mo
Best forEngineering teams offloading tickets. Ops/platform work.Devs wanting offline/local LLMs for privacy or experimentation.Developers who want open-source tooling with full control.PMs, founders, non-devs shipping MVPs.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • 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
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • 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 verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for local inference. If you care about privacy or want to tinker, install this today.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.
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