# DockDoor - Free Alt+Tab and Dock Preview Window Switcher for Mac

> DockDoor is a free, open-source macOS menu bar app with Windows-style dock hover previews, enhanced Alt+Tab switching, gestures, and zero telemetry.

Published: 2026-04-13
URL: https://daniliants.com/insights/dockdoor-free-alt-tab-and-dock-preview-window-switcher-for-mac/
Tags: macos, window-management, alt-tab, open-source, dock, free, solo-developer

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## Summary

DockDoor is a free, open-source macOS menu bar app that brings Windows-style dock hover previews and enhanced Alt+Tab window switching to Mac. It fills a long-standing macOS gap - hovering a dock icon now shows live previews of all windows for that app, with keyboard control, gestures, and per-window close/minimize buttons. Runs locally with zero telemetry.

## Key Insight

- **Fills a real macOS gap**: native Command+Tab switches apps but not windows; Mission Control is visual but slow. DockDoor gives dock-hover live previews like Windows 11 taskbar.
- **Alt+Tab (Option+Tab) as dedicated window switcher**: separate from Cmd+Tab, with thumbnail previews and keyboard navigation (Tab/Shift/arrows).
- **Power-user gestures nobody advertises**:
  - Cmd + Right Click on dock icon = instant quit; Cmd + Opt + Right Click = force quit (no Activity Monitor needed).
  - Middle-click any preview = close that window without switching focus.
  - Scroll up on dock icon = bring to front; scroll down = hide all windows.
  - Two-finger swipe on preview = minimize/maximize.
  - Shake a preview = minimize/close all other windows (expose one-window focus mode).
- **Drag-and-drop between apps from dock previews** - drop a file onto a preview to open in that specific window.
- **Widgets on hover**: Spotify/Apple Music with synced lyrics; Calendar icon hover shows day's events.
- **Privacy stance is aggressive**: no analytics, no crash reports, no network calls at all. Debug logs stay local.
- **Funded by donations only**: one solo developer, no subscription, no ads. ~$3 tier exists.
- **Requires macOS 13 Ventura+**, runs native on Apple Silicon and Intel.
- **Warning**: sketchy re-uploads exist on third-party sites with potential malware. Only use dockdoor.net or the official GitHub.