WebBrain

WebBrain is an open-source AI browser agent for Chrome and Firefox that reads pages, extracts data, and automates tasks.

WebBrain is a free, open-source browser extension that brings AI agent capabilities directly to your browser sidebar. It allows users to read, understand, and automate any web page using their choice of local or cloud LLMs, including llama.cpp, OpenAI, Claude, and OpenRouter. The tool operates in two modes: a read-only Ask Mode for answering questions and summarizing content, and an Act Mode for clicking, typing, and executing multi-step browser workflows. Designed with privacy in mind, it features token-conscious screenshot compression, local profile auto-fill, cookie consent banner dismissal, and optional CAPTCHA solvers. It is built for everyday users who want a secure, auditable AI assistant that stays in control while they browse the web.

WebBrain at a glance

Best for: Software engineer, Founder
Runs on: Chrome extension, Firefox, Web
Pricing: Free forever
Released: April 2026
Category: AI agent tool
Website: webbrain.one

Key features

Read-only Ask Mode by default
Full browser agent for clicking and typing
Structured data extraction from pages and PDFs
Multi-provider LLM support including local llama.cpp
Token-conscious screenshot compression
Cookie and paywall awareness
Profile auto-fill for quick form completion
Multilingual UI supporting five languages

Use it for

Extract structured data from tables and forms
Automate repetitive browser tasks with natural language
Summarize and answer questions about page content
Fill out signup forms using local profile data
Run private local chat with offline Wikipedia

Companions

Tools that articles about WebBrain recommend using with it, each with its job.

Playwright — Hand-coded automation for the fixed, high-volume parts.
Ollama — Any OpenAI-compatible local model, at no cost per task.
LangChain — Compose exactly the agent your use case needs from model, tools, prompt, and middleware.
CrewAI — Gives CrewAI agents a real browser.

Alternatives to WebBrain

BrowserOS — Runs entirely locally and lets AI agents use real user logins to complete tasks.
Nanobrowser — Run multi-agent workflows using your own LLM API key directly in your browser.
Webwright — Enables code-based web automation with reusable and rerunnable scripts.
Browser Use — Managed remote browsers built for protected sites at $0.02 an hour.
BrowserAct Skills — Builds tested web scrapers from single text prompts with managed infrastructure.
Moli — A lightweight, structure-first browser engine with low memory usage.
Ego Lite — Executes browser automation in isolated workspaces using existing logins.
Steel — Run scalable cloud browser sessions with a simple developer API.
Alook — Connects existing local coding agents to team communication channels.
Page Agent — Integrates directly into web pages without browser extensions or headless browsers.
BrowserKitten — Executes tasks directly in the browser via side panel with no external server.
Browser Use Web UI — It supports custom browser integration and persistent sessions.

All WebBrain alternatives