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AltTab vs Peninsula: catalog facts
AltTab	Peninsula
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the GPL-3.0.
macOS	macOS
It switches between individual windows with live thumbnail previews instead of macOS's application-level switcher, with…	Cmd-Tab replacement for window switching Notification counts shown at the notch
It needs screen recording and accessibility permissions, and thumbnail previews cost some memory on a busy desktop.	Requires Accessibility permission and manual trust of the app Small one-person project with occasional updates
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account 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 October 2, 2026

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