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YDL-UI vs 4K Video Downloader Plus: catalog facts
YDL-UI	4K Video Downloader Plus
Free Free and open source under the MIT licence.	Freemium Free to download, with a paid Premium license for extra features.
Windows	Windows, macOS, Linux
No command line needed to use youtube-dl Bundles youtube-dl and ffmpeg	Downloads entire playlists, channels and search results Saves up to 4K and 8K resolution
Built around youtube-dl rather than the more active yt-dlp Development has been quiet since early 2024	Some features require a paid Premium license Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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