My Styles is described as 'Transform the web to fit your needs. My Styles works as an extension in Safari that gives you the power to change the appearance of any website in seconds, from simple font tweaks to full CSS overrides' and is an app in the development category. There are four alternatives to My Styles for a variety of platforms, including Microsoft Edge, Google Chrome, Mozilla Firefox, Safari and Thunderbird apps. The best My Styles alternative is Dark Reader, which is both free and Open Source. Other great apps like My Styles are Stylus, Cascadea and Stylebot.
This eye-care extension enables night mode creating dark themes for websites on the fly. Dark Reader inverts bright colors making them high contrast and easy to read at night.
Introducing Cascadea, the first custom style manager designed as a Safari App Extension and native macOS app. Cascadea makes it easy to install custom styles that change the look and feel of any website you want.
Change the appearance of websites instantly by applying a easy to use interface for changing the CSS. Preview and install styles created by users for your favorite websites.
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