DockMaster vs AltTab: Best Mac Window Switcher in 2026

If you're looking for a better window switcher on macOS, two names come up repeatedly: AltTab and DockMaster. Both replace or enhance the default Cmd+Tab experience, but they take fundamentally different approaches. Here's a fair, side-by-side comparison to help you decide which one fits your workflow.

AltTab: Free, Open-Source Window Switching

AltTab is a well-known, open-source macOS utility that replaces Cmd+Tab with a Windows-style Alt+Tab switcher. It shows window thumbnails instead of app icons, making it much easier to pick the right window.

Price: Free (open-source, MIT license)
Core feature: Window-level Cmd+Tab replacement with thumbnails
Customization: Shortcut, appearance, window filtering
Tech: Swift + Objective-C, uses Accessibility APIs
Privacy: Open-source, no telemetry

AltTab does one thing and does it well. If all you need is a window switcher that shows thumbnails instead of app icons, AltTab is an excellent free choice.

DockMaster: All-in-One Desktop Productivity

DockMaster started as a dock preview utility but has evolved into a comprehensive desktop productivity tool. Window switching is one of five core features that work together.

Price: Free tier + Pro at £14.99 (one-time purchase)
Dock Preview: Hover over any Dock icon to see live window thumbnails
Global Switcher: Option+Tab full-screen window grid with type-to-search
Clipboard Manager: Option+C for clipboard history with image support
File Shelf: Drag-and-drop staging area for files
Edge Snapping: Drag windows to screen edges for half/quarter tiling
Tech: 100% native Swift, uses ScreenCaptureKit + Accessibility APIs
Privacy: Local-only processing, no data uploaded, no analytics

Feature Comparison

Window Switching

Both apps show window-level thumbnails. AltTab replaces the Cmd+Tab switcher inline, mimicking the Windows Alt+Tab overlay. DockMaster's Global Switcher opens a full-screen grid that's easier to scan when you have 20+ windows open, and adds type-to-search filtering.

Dock Integration

AltTab doesn't integrate with the Dock. DockMaster's primary feature is Dock hover preview — hover over a Dock icon to see live thumbnails of that app's windows. This is a unique capability no other macOS utility provides at this level.

Clipboard History

AltTab doesn't include clipboard management. DockMaster has a built-in clipboard manager with memory-safe image handling, sensitive content masking, and a 50MB cache limit — accessible via Option+C.

File Shelf

AltTab doesn't include file management. DockMaster's File Shelf lets you drag files to a floating panel and drop them into any app later, replacing the need for temporary desktop clutter.

Window Tiling

AltTab doesn't include window tiling. DockMaster adds edge snapping — drag a window to a screen edge for half, quarter, or fullscreen tiling.

Cross-Space Window Management

Both apps can show windows from other Spaces. DockMaster goes further with silent cross-Space teleportation — it brings a window to your current Space without triggering the macOS space-switching animation.

Performance

Both apps are built with Swift and perform well on Apple Silicon. AltTab is lightweight since it does one thing. DockMaster is heavier in features but maintains idle CPU under 0.1% through event-driven architecture and Grand Central Dispatch — no polling loops or background daemons.

Privacy

AltTab is open-source, so you can audit every line of code. DockMaster is closed-source but operates entirely locally — no network requests, no telemetry, no data collection. Both apps require Accessibility and Screen Recording permissions and use them solely for window management.

When to Choose AltTab

You only need a window switcher and nothing else.
You prefer open-source software you can audit and modify.
You want a completely free solution.

When to Choose DockMaster

You want dock previews, clipboard history, file shelf, and window tiling in one app.
You prefer reducing the number of separate utilities running on your Mac.
You need type-to-search and cross-Space teleportation in your window switcher.
You value native Swift performance with sub-0.1% idle CPU.

Verdict

AltTab is a fantastic free tool if window switching is your only need. DockMaster is for users who want an all-in-one desktop productivity suite that replaces multiple separate utilities. At £14.99 one-time, DockMaster Pro costs less than a month of most subscription apps — and it replaces three or four of them.

Both are solid choices. Try them both and see which fits your workflow better.