WebBrain
The sidebar agent for the rest of us
WebBrain launched on August 13, 2026 with 117 votes, #293 of 23,274 launches that month and more than 95% of that year's launches.
In plain words
WebBrain is a free, open-source browser extension that brings AI agent capabilities to Chrome, Firefox, and Edge. It reads web pages, extracts data, and automates tasks from the sidebar using your choice of local models via llama.cpp or cloud providers like OpenAI and Claude. The extension prioritizes privacy by keeping data on-device, uses token-conscious screenshots, and includes safety features like read-only mode and protection against prompt injection attacks. It supports a multilingual interface and is available under an open-source license.
written from the facts on this page · September 2026
From the sources
Your browser, your models, your data. WebBrain is a free, open-source AI browser agent for Chromium browsers and Firefox. Run it locally with llama.cpp and most queries cost nothing — your data never leaves your device. It reads pages, extracts data, and automates tasks right from the sidebar. Prefer the cloud? Bring your own API key for OpenAI, Claude, OpenRouter, or 100+ OpenAI-compatible providers. Multilingual UI, token-conscious screenshots. MIT licensed.
WebBrain is a free, open-source alternative to Claude's browser plugin. AI browser agent for Chrome, Firefox, and Edge — read pages, extract data, automate tasks. Works with llama.cpp, OpenAI, Claude, OpenRouter. Multilingual UI, token-conscious screenshots. GPL-3.0-or-later licensed.
Free, open-source alternative to Claude in Chrome. Use any model, including local ones, so your pages never leave your machine. The browser is where real work happens — and an adversarial surface. WebBrain starts in read-only Ask Mode, asks before it acts, defends against hidden prompt injections, and handles sensitive fields with stricter rules. See how WebBrain reads pages, extracts data, and automates browser tasks. Same task, same browser. WebBrain runs Gemma 4 31B on-device and finishes first. Connect to any OpenAI-compatible API or run local models with Ollama, LM Studio, or llama.cpp. Keep your pages, prompts, and browsing data entirely on your machine. A full-featured AI agent that…from webbrain.one
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