Best for

Windows converts and heavy multitaskers who want to see every open window instead of cycling blind.

Why it deserves attention

AltTab replaces the system switcher with a thumbnail grid of every window, grouped by app or shown individually, and supports several visual styles plus configurable shortcuts, appearance, exclusions, and behavior across Spaces. It is a native Swift app, GPL-3.0, with about 16,500 GitHub stars and a free core; a Pro tier adds extra switcher styles and window search. It needs Accessibility and Screen Recording permissions for thumbnails, some macOS updates change window APIs and cause regressions until a release catches up, and very large window counts make preview capture heavier.

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Can replace

Witch
Hyperswitch

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