xStyle is described as 'A Chinese Developed Theme Manager. based on the source code of Stylish-for-Chrome 1.7.0' and is an app in the Web Browsers category. There are more than 10 alternatives to xStyle for a variety of platforms, including Google Chrome, Online / Web-based, Mac, Windows and Linux. The best alternative is Dark Reader, which is both free and Open Source. Other great apps like xStyle are Stylus (Free, Open Source), Wikiwand (Free), Stylebot (Free, Open Source) and Amino: Live CSS Editor (Free).
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. You can adjust brightness, contrast, sepia filter, dark mode, font settings and ignore-list.
Make visual changes to any website with CSS and see changes in real time. Sync, edit, and export your custom style sheets. - Customize websites with CSS by creating your own user style sheets. Customize page appearance, fix rendering bugs, make the web what you want it to be.
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.