Compare AI tools

	Perplexity S	GitHub Copilot B	OpenRouter S	Aider A
Tagline	AI search done right. Cited answers, not chat theater.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	One API, every model. Pay-as-you-go, no subscriptions.	Terminal-based AI pair programmer. Git-aware, model-flexible.
Category	research	coding	dev platform	coding
Pricing	Free + $20/mo Pro	Free (limited) + $10/mo Pro + $19/mo Business	Pay per token — model-dependent	Free (open source) + whatever API you use
Best for	Replacing Google for any question where you want a cited answer in seconds.	Teams with GitHub already. Devs who don't want to change IDEs.	Developers experimenting across models. Apps that want fallback logic.	Developers who want open-source tooling with full control.
Strengths	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Great enterprise story Works in your existing IDE Chat + autocomplete	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
Weaknesses	Not a general chatbot Answers can be shallow on complex topics	Less agentic than Cursor/Claude Code Model quality varies	Slight markup over direct API Some provider features not exposed	Terminal-only Less agentic than Claude Code Setup on Windows is fiddly
Kai's verdict	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	S-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.
Link	Open →	Open →	Open →	Open →