We have implemented into our ASP.NET website few year back. Things I like about Spin JS are 1. Very lightweight 2. Easy to integrate into existing websites 3. Configurable using CSS 4.Responsive and works with any screen sizes 5. No licensing issues as it is MIT lisenced

Spin JS is a dynamic loader for all the website loads; during my time at one of my previous organisations, we used this, and it helped improve the CAQ Ration by 22%, but it was way back in 2019.

I was there when the world of web development was taken by storm by the (re)discovery of the superpowers of XMLHttpRequest(), and already had a few years of experience under my belt.So I remember well we were missing a way of indicating that an Ajax request was being performed; soon after that came websites that allowed you to download a plethora of GIF and PNG spinners of varying size and (usually low) quality. Spin.js is the highly polished stepchild of those early attempts, and provides a neat ES6 JS script that can generate a spinner from a number of parameters. If you are the rare kind of developer who needs exactly this kind of indicator, there's nothing better that Spin.js.