AlliHat is a Safari sidebar extension that brings multiple large language models (Claude, ChatGPT, Gemini) and Apple's on-device AI into the browser for contextual assistance. It provides page-aware question answering, letting users ask about the current webpage, highlight text to get instant summaries or answers, and run an automated browsing mode that can follow links and collect information. By unifying cloud models and an on-device option in a lightweight sidebar, AlliHat aims to speed web research, provide quick inline assistance while preserving privacy options through local model usage.