The best alternatives to MediumX are iTunes, Medium, and Darker Medium. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of MediumX?
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Darker Medium applies a customizable dark theme to *all* medium formatted stories. You can customize the header background, main accent color, highlight color and link styles separately from the option menu. No matter the domain, if a site is using Medium, it will get a dark theme; that is the main advantage over Stylus and Stylish.