jQuery is the more common of the two in our index: it runs on 21,565 websites against 20 for Ramda, and 4 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.
Ramda is a practical functional programming library for JavaScript that emphasizes immutability, currying, and function composition to facilitate writing more declarative and modular code.
4 sites run both jQuery and Ramda. That is 20% of the sites using Ramda, 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.