AltTab

AltTab is a powerful and free open-source macOS utility designed to bring the intuitive, window-centric application switching experience of Windows to Apple's desktop operating system. Traditionally, macOS's native Command+Tab switcher cycles between applications, often hiding individual windows within an app. AltTab remedies this by displaying clear, resizable thumbnail previews of all open windows across all applications, allowing users to effortlessly navigate and switch directly to the exact window they need. Developed by lwouis and actively maintained, AltTab has become an essential tool for power users, developers, designers, and anyone engaging in heavy multitasking workflows in 2026. Its key differentiators lie in its visual clarity, deep customization options, and remarkably lightweight performance, which ensures it enhances productivity without imposing system overhead. The application fills a critical gap for users migrating from Windows or those who simply desire a more efficient way to manage numerous open documents, browser tabs, and coding environments. As of 2026, AltTab remains a top recommendation for streamlining macOS window management, seamlessly integrating familiar functionality while respecting Apple's aesthetic.