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AI-powered browser automation through natural language. Tell it what to do, and watch it browse for you.

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Built for the Modern Web

Everything you need for intelligent browser automation, powered by leading AI models.

Multi-Model AI

4 providers, 20+ models. Choose from xAI Grok, OpenAI GPT, Anthropic Claude, or Google Gemini, including a free tier.

Natural Language

No scripting required. Describe your task in plain English and FSB figures out the clicks, types, and navigations.

50+ Browser Actions

Click, type, scroll, drag-and-drop, canvas drawing, CDP mouse control, multi-tab management, and more.

Smart DOM Analysis

Incremental DOM diffing, multi-strategy selectors, and element identification for reliable automation.

Visual Feedback

Viewport glow borders, element highlighting with orange pulse, and a floating progress overlay show exactly what FSB is doing.

Site Intelligence

142+ built-in site guides spanning e-commerce, finance, social media, travel, career, coding, and productivity platforms.

Background Agents

Schedule tasks to run on intervals, daily, or once. Record workflows and replay them with cost savings tracking.

MCP Integration

Use FSB as an MCP server from Claude Code, Cursor, or any MCP client. Automate browsers directly from your IDE.

Remote Dashboard

Monitor and control FSB from any device. QR-code pairing, live DOM preview, and real-time task execution.

Memory & Learning

FSB remembers navigation patterns across sites. Semantic, episodic, and procedural memory for smarter automation over time.

Better Than All of Them. Without Vision.

Project Mariner, Claude Computer Use, OpenAI Operator, OpenClaw. They all rely on vision to understand the page. FSB reads the actual DOM. No vision needed. Faster. Cheaper. More accurate.

Project Mariner

Vision

Computer Use

Vision

Operator

Vision

OpenClaw

Vision
FSB

FSB

DOM-Based

Better than all of them. Pure structural intelligence. Zero vision. Zero guessing.

50-200ms
Per step vs 1-3s
~$0.03
Per 100 steps vs $0.18
Yes
Hidden elements vs No

Works WITH All of Them

FSB does not just compete. It complements. Through its MCP server, Claude Code, Cursor, Windsurf, and any MCP-compatible agent can use FSB as their browser automation layer. The intelligence of any AI combined with the precision of FSB's DOM engine.

How It Works

Three simple steps from instruction to completion.

1

Describe Your Task

Type a natural language instruction into the FSB chat panel. "Book a flight from SF to NYC" or "Find the cheapest laptop on Amazon."

2

FSB Analyzes & Acts

FSB reads the page, plans actions, and executes them. Clicking, typing, scrolling, and navigating as needed.

3

Task Complete

FSB verifies the result, reports back in the chat, and gives you a summary. Review the outcome and iterate if needed.

Choose Your AI Provider

Works with the leading AI platforms. Bring your own API key.

Recommended
xAI

xAI Grok

Grok 4.1, Grok 4.1 Fast, Grok Code Fast

OpenAI

GPT-4o, GPT-4o Mini, GPT-4 Turbo

Anthropic

Anthropic

Claude Sonnet 4.5, Haiku 4.5, Opus 4.1

Google Gemini

Google Gemini

2.5 Flash, 2.5 Pro, 2.0 Flash (FREE)

OpenRouter

OpenRouter

200+ models through a single API key

Starting from FREE with Gemini 2.0 Flash. Budget options from $0.15/M tokens.

Open Source. MIT Licensed. Built for Everyone.

FSB is free and open source. Inspect the code, contribute features, or fork it for your own use.

View on GitHub