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Seelen UI vs YASB: catalog facts
Seelen UI	YASB
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to download and use, with source code published on GitHub.
Windows	Windows
Offers configurable panels, launching and window-management features.	Many widgets that can be combined into a custom bar Easy theming and deep styling control
Deep desktop customization may interact with other shell extensions.	Windows only Setup relies on editing configuration rather than a full settings interface
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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