A: Hello.
Thanks for your interest in our items.
This plugin is not available for download on WordPress.com. There are many other plugins with similar functionality https://nimb.ws/hGDtiB
If you have time and inspiration, you can test them all.
The difference between our products is that they are developed not by amateurs or students, but by professionals. The code is stable and well-documented. The functionality is simple, but it works in all modern browsers, as well as on mobile devices.
If we talk about the key advantage of the Reading Indicator - in my opinion, these are zero dependencies. Native JavaScript, without jQuery. Only 3,4 KiB compressed JS. This is very good for SEO. One of the key indicators is site speed.
In any case, I'm not trying to persuade you or say that all other plugins are junk. I show the main differences, the final decision is up to you.

Warm Regards Alexander,
from 42Theme