For most users: (command-line) or JDownloader 2 (GUI) are the most reliable and free. If you want a simpler paid option, 4K Video Downloader + correct cookie import works well.
Apple restricts system-wide downloaders. Your best bet is Documents by Readdle . Use its internal browser to open the video page, long-press the playing video, and select "Download Linked File." Alternatively, use Shortcuts automation (search for "Media Mutt" shortcut).
: 9xconvert stands alone with its local-first processing model that ensures your files never leave your device.
Online platforms require no software installations. They work directly inside your mobile or desktop web browser for quick, occasional downloads.
VidMate competes closely with Videoder, offering a sleek design and additional entertainment options beyond simple downloading. It combines video downloading with live TV streaming and a built-in media player, making it a versatile app for both offline and online content consumption.