Topic analysis

Show HN: Gemma Gem – AI model embedded in a browser – no API keys, no cloud

Your personal AI assistant living right inside the browser. Gemma Gem runs Google's Gemma 4 model entirely on-device via WebGPU — no API keys, no cloud, no data leaving your machine. It can read pages, click buttons, fill forms, run JavaScript, and answer questions about any site you visit. Load the extension in chrome://extensions (developer mode) from .output/chrome-mv3-dev/ . Click the gear icon in the chat header: All logs are prefixed with [Gemma Gem] . In development builds, info/debug/warn logs are active. Production builds only log errors. The offscreen document logs are the most useful — they show model loading, prompt construction, token counts, raw model output, and tool execution. The agent/ directory has zero dependencies. It defines interfaces ( ModelBackend , ToolExecutor ) and can be extracted to a standalone library.