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AltTab vs DockDoor: catalog facts
AltTab	DockDoor
Free The software is free under its open-source licence. Hosting, hardware and external…	Free The software is free under its open-source licence. Hosting, hardware and external…
macOS	macOS
It switches between individual windows with live thumbnail previews instead of macOS's application-level switcher, with…	Hovering a Dock icon previews every open window for that application, which macOS otherwise leaves you guessing about.
It needs screen recording and accessibility permissions, and thumbnail previews cost some memory on a busy desktop.	This is the free application; the separately sold DockDoor Pro holds the extra features, and it needs accessibility…
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.