Text Blackness is a Chrome extension developed by Hao Chi Kiang that aims to improve readability for users with bad eyesight. This free extension intelligently blackens all text on web pages, making it easier to read. Users have the option to customize the level of blackness and the amount of color allowed.

One of the standout features of Text Blackness is its ability to intelligently whiten text if the background is black. It also detects colorful backgrounds and adjusts the text accordingly. Additionally, users can adjust the minimal font size without zooming in, ensuring that the overall layout of the webpage remains intact.

Another useful feature is the ability to force thin or light fonts to become normal or even bold, enhancing visibility. Links can be made extra colorful to make them visually stand out, and all links in web pages can be underlined for improved navigation.

Please note that Text Blackness offers a 7-day free trial and requires a one-time purchase to continue using the extension after the trial period.

For more information about privacy and terms of service, please visit the developer's website.