Undock Engine

Decouple multi-pane web applications into synchronized multi-monitor windows. Built for Gmail Reading Pane.

Tired of Gmail's split-pane view crowding your inbox list and email thread onto a single display? Undock Engine frees your inbox. It detaches Gmail’s Reading Pane into a dedicated, synchronized secondary window—giving you a 100% full-width inbox on your primary screen and plenty of room to read threads on your second monitor. Why Use Undock Engine? • Dual-Monitor Efficiency: Scan your full inbox list on one monitor while reading long threads and replies on another. • Native Gmail Hotkeys: Full single-key triage support (j/k to navigate, e to archive, # to delete, s to star, r to reply, u to re-dock). • Zero Disruption: Built-in typing protection automatically pauses shortcuts while you compose searches, replies, or drafts. • Persistent Layout: Remembers your detached window size, monitor placement, and appearance settings across sessions. • Seamless Style Matching: Automatically mirrors your exact Gmail theme, dark mode, and custom interface fonts. How to Use: Enable Split Pane view in Gmail (Settings → Reading Pane → Right of Inbox). Click the Undock button in the Gmail toolbar or press Ctrl+Shift+U (Cmd+Shift+U on macOS). Triage your inbox on screen one; read emails on screen two. Press "u" or close the secondary window at any time to re-dock instantly. Privacy & Security: • 100% Local Execution: Operates entirely inside your browser with no external servers, no telemetry, and zero tracking. • No Content Storage: Does not store, log, or transmit your emails, credentials, or personal data. Open Source & Repository: Undock Engine is free and open source under the MIT License. You can inspect the source code, file bug reports, or contribute improvements directly on GitHub: https://github.com/gordonyfg/undock-engine Technical Architecture (Under the Hood): • Single Source of Truth: The primary Gmail tab retains authoritative state; the detached window functions as an active visual projection. • Real-Time Synchronization: Powered by MutationObserver with sub-5ms sync latency, scroll reflection, and bi-directional event proxying back to Gmail's native DOM. • Manifest V3 Compliant: Implements strict extension security boundaries with automated resource and listener teardown upon re-docking.