Compare AI tools

	Devin A	Perplexity S	Aider A	Ollama S
Tagline	Cognition Labs' autonomous coding engineer.	AI 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.
Category	agents	research	coding	dev platform
Pricing	$500/mo	Free + $20/mo Pro	Free (open source) + whatever API you use	Free + open source
Best for	Engineering teams offloading tickets. Ops/platform work.	Replacing 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.
Strengths	Works like an engineer — takes Slack tasks, opens PRs Handles multi-hour engineering work Reports back with what it did	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)
Weaknesses	Expensive Best for well-scoped tasks Not for solo hobbyists	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
Kai's verdict	A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.	S-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.
Link	Open →	Open →	Open →	Open →