bmux

Product Introduction

1. Definition: bmux is a free, open-source Chromium-based browser application designed for macOS, Windows, and Linux. It functions as a browser multiplexer, enabling advanced tab and window management, session control, and automation.
2. Core Value Proposition: bmux exists to solve the problem of browser tab overload and inefficient multi-account workflows by introducing native split-pane browsing, persistent named sessions, and a powerful CLI for agentic automation, all within a single, unified window.

Main Features

1. Browser Multiplexer: This core feature transforms the traditional browser window into a multi-pane workspace. Users can split the view horizontally or vertically to display multiple web pages simultaneously. It supports saved workspaces, allowing for rapid context switching between different projects or tasks. Technically, it leverages Chromium's multi-process architecture to render each pane independently while managing them under a single native application window.
2. Agentic Browsing: bmux provides a Command Line Interface (CLI) that allows developers and power users to programmatically control browser panes. This enables background automation, web scraping, and monitoring of automated agents (like scripts or bots). The unique aspect is that these automated sessions run in dedicated, visible panes within the main bmux window, allowing for real-time observation and debugging.
3. Separate Profiles & Proxy Management: Each pane or session in bmux can be assigned a distinct browser profile. These profiles maintain separate cookies, cache, and local storage. Crucially, each profile can be configured with its own proxy connection (SOCKS5, HTTP), which is essential for web scraping, multi-account management, and security testing to avoid IP-based detection.
4. Device Simulation: Integrated directly into the browser, this feature allows users to emulate various mobile devices (e.g., iPhone, Android phones) with preset screen resolutions, user-agent strings, and device pixel ratios. Users can toggle device orientation (portrait/landscape) instantly, facilitating responsive web design testing and mobile-first development without external developer tools.

Problems Solved

1. Pain Point: Context switching fatigue and tab chaos. Traditional browsers force users to manage dozens of tabs across multiple windows, making it difficult to organize work for different projects, clients, or research tasks.
2. Target Audience: The primary users are developers (front-end, QA, full-stack), data scientists, growth hackers, digital marketers managing multiple accounts, SEO specialists, and security researchers who require organized, parallel browsing and automation capabilities.
3. Use Cases:
   • Development & QA: A developer can have documentation, a local dev server, and a production site open in separate panes within one "Development" session, while a QA tester simulates mobile devices in another pane.
   • Multi-Account Management: A social media manager can log into different client accounts in separate panes, each with its own profile and proxy, without cross-contamination of cookies.
   • Automated Data Extraction: A data analyst can write a Node.js script using the bmux CLI to control a pane, navigate websites, and scrape data, while visually monitoring the process for errors.
   • Competitive Research: A marketer can create a session with panes for each competitor's website, using different simulated devices to analyze their mobile experience.

Unique Advantages

1. Differentiation: Unlike traditional browsers or tab grouping extensions, bmux offers native, persistent pane management. Unlike standalone automation tools like Puppeteer or Playwright, which run headlessly or in detached windows, bmux brings automation into a visible, manageable GUI. It combines the user-friendliness of a visual browser with the power of a programmable automation engine.
2. Key Innovation: The seamless integration of a visual, multi-pane browser interface with a fully-featured CLI for automation. This "observable automation" model, where automated agents (CLI-controlled panes) operate visibly alongside manual browsing panes, is a novel approach that bridges the gap between manual and automated web interaction.

Frequently Asked Questions (FAQ)

1. Is bmux a secure browser for daily use? bmux is built on the Chromium engine, inheriting its core security and sandboxing features. Being open-source allows for community security auditing. For sensitive activities, users should leverage its separate profiles feature to isolate sessions.
2. How does bmux compare to using browser developer tools for device simulation? While DevTools offer emulation, bmux's device simulation is a persistent, first-class feature accessible outside developer mode, allowing for quicker toggling between devices and orientations as part of a standard browsing workflow.
3. Can I use bmux for large-scale web scraping projects? bmux is ideal for controlled, monitorable scraping tasks and automation where visual verification is beneficial. For massive, distributed scraping at scale, dedicated headless browser libraries combined with proxy rotators might be more efficient, though bmux's per-profile proxy support is a strong feature for moderate-scale needs.
4. What are the system requirements to run the bmux CLI for automation? The bundled CLI requires Node.js version 22.12 or newer. Automation scripts are written in JavaScript/Node.js, interacting with the bmux host process via its CLI API.
5. Is bmux available for all operating systems? Yes, bmux provides native installers for macOS (Apple Silicon and Intel via DMG or Homebrew), Windows (x64 .exe installer), and Linux (portable x64 and ARM64 tarballs that require Node.js and Xvfb to run as a host).