ReBar is a useful WordPress Plugin for improving User Experience during a blog post reading. This plugin adds a Progress Bar to the top or bottom of the page. As you read the post or scroll the page, the Reading Progress Bar is filled with the color or beautiful gradient. Such indicators are very useful for long Posts and Articles to help readers understand how far they are from finishing the article.

Demo: https://codecanyon.net/item/rebar-reading-progress-bar-for-wordpress-website/23941493