youtube-dl is a command-line utility for downloading videos or extracting audio files from streaming websites such as YouTube, Dailymotion, and Vimeo. Developed by Ricardo Garcia Gonzales
License: Open Source
Video DownloadHelper is primarily a browser extension that offers a user-friendly approach to downloading videos, making it ideal for casual users. In contrast, youtube-dl is a command-line tool that provides extensive customization options and supports a broader range of sites, catering more to advanced users.