Gemma Gem – AI model embedded in a browser – no API keys, no cloud
Gemma Gem is a Chrome extension that loads Google's Gemma 4 (2B) through WebGPU in an offscreen document and gives it tools to interact with any webpage: read content, take screenshots, click elements, type text, scroll, and run JavaScript. You get a small chat overlay on every page. Ask it about the page and it (usually) figures out which tools to call. It has a thinking mode that shows chain-of-thought reasoning as it works. It's a 2B model in a browser. It works for simple page questions and running JavaScript, but multi-step tool chains are unreliable and it sometimes ignores its tools…
Gemma Gem – AI model embedded in a browser – no API keys, no cloud launched on April 6, 2026 with 156 votes, #202 of 21,248 launches that month and more than 95% of that year's launches.
In plain words
Gemma Gem is a Chrome extension that runs Google's Gemma 4 language model locally in the browser using WebGPU, with no API keys or cloud required. It provides a chat overlay on webpages and can read page content, take screenshots, click elements, type text, scroll, and run JavaScript based on user requests. The extension includes a thinking mode that displays its reasoning process. It handles simple page questions and JavaScript execution well, though multi-step interactions and tool use can be unreliable.
written from the facts on this page · September 2026
From the sources
Gemma Gem runs Google's Gemma 4 model entirely on-device via WebGPU — no API keys, no cloud, no data leaving your machine. - kessler/gemma-gem
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. pnpm install pnpm build Load the extension in chrome://extensions (developer mode) from .output/chrome-mv3-dev/ . Offscreen Document Service Worker Content Script (Gemma 4 + Agent Loop) <-> (Message Router) <-> (Chat UI + DOM Tools) | | WebGPU inference Screenshot capture Token streaming JS execution Offscreen document : Hosts the model via @huggingface/transformers + WebGPU. Runs the agent loop. Service…from github.com
In the maker’s words, at launch
Gemma Gem is a Chrome extension that loads Google's Gemma 4 (2B) through WebGPU in an offscreen document and gives it tools to interact with any webpage: read content, take screenshots, click elements, type text, scroll, and run JavaScript. You get a small chat overlay on every page. Ask it about the page and it…
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Cactus Hybrid: We taught Gemma 4 to know when it's wrongJul 2026 · github.com · ▲191Hey HN, Henry & Roman here from Cactus. A small, on-device model is fast and private, but sometimes wrong, but frontier models are getting expensive pretty fast. So, we post-trained Gemma 4 E2B post-trained to know when it's wrong. Every response comes with a confidence score between 0 and 1. Developers can accept the on-device when it's high, hand off to a bigger cloud model when it's low. By routing only 15-35% of queries to Gemini 3.1 Flash-Lite, Gemma-4-E2B matches Gemini 3.1 Flash-Lite on most benchmarks. - ChartQA: 15-20% - LibriSpeech: 25-30% - MMBench, GigaSpeech, MMAU: 30-35% -…
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