jQuery is the more common of the two in our index: it runs on 28,785 websites against 64 for NProgress, and 59 sites use both. Counts come from real scans, not vendor claims.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
NProgress is a JavaScript library that displays a nanoscopic progress bar at the top of websites or web applications. It includes trickle animations to indicate loading activity, enhancing user experience by showing that content is being loaded.
59 sites run both jQuery and NProgress. That is 92% of the sites using NProgress, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.