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

https://github.com/kessler/gemma-gem
15•ikessler•3h ago
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 entirely. The agent loop has zero external dependencies and can be extracted as a standalone library if anyone wants to experiment with it.

Comments

avaer•47m ago
There's also the Prompt API, currently in Origin Trial, which supports this api surface for sites:

https://developer.chrome.com/docs/ai/prompt-api

I just checked the stats:

  Model Name: v3Nano
  Version: 2025.06.30.1229
  Backend Type: GPU (highest quality)
  Folder size: 4,072.13 MiB
Different use case but a similar approach.

I expect that at some point this will become a native web feature, but not anytime soon, since the model download is many multiples the size of the browser itself. Maybe at some point these APIs could use LLMs built into the OS, like we do for graphics drivers.

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

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