Compare AI tools

	OpenRouter S	Perplexity S	Aider A	Le Chat (Mistral) B
Tagline	One API, every model. Pay-as-you-go, no subscriptions.	AI search done right. Cited answers, not chat theater.	Terminal-based AI pair programmer. Git-aware, model-flexible.	French alternative. Fast, European, privacy-focused.
Category	Dev Platform	Research	Coding	Chatbots
Pricing	Pay per token — model-dependent	Free + $20/mo Pro	Free (open source) + whatever API you use	Free + $15/mo Pro
Best for	Developers experimenting across models. Apps that want fallback logic.	Replacing Google for any question where you want a cited answer in seconds.	Developers who want open-source tooling with full control.	European users with data residency needs. Fans of open-weight models.
Strengths	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	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	European data residency Very fast responses Open-weight Mistral models available Good French/European languages
Weaknesses	Slight markup over direct API Some provider features not exposed	Not a general chatbot Answers can be shallow on complex topics	Terminal-only Less agentic than Claude Code Setup on Windows is fiddly	Smaller capability gap vs frontier models Less polished UX
Kai's verdict	S-tier for model-shopping. I use this for every prototype before committing.	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.	B-tier overall, A-tier if GDPR/data residency matters. Solid backup option.
Link	Open →	Open →	Open →	Open →