Stylus is described as 'Redesign the web with Stylus, a user styles manager' and is a very popular user styles manager in the web browsers category. There are more than 10 alternatives to Stylus for a variety of platforms, including Google Chrome, Web-based, Mozilla Firefox, Mac and Windows apps. The best Stylus alternative is Dark Reader, which is both free and Open Source. Other great apps like Stylus are Stylebot, xStyle, Amino: Live CSS Editor and Stylem.
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.
Styling websites by adding your own css is not allowed. Just a (yet wonderful) switch light / dark
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.
Make visual changes to any website with CSS and see changes in real time. Sync, edit, and export your custom style sheets.
A user style manager for Pale Moon, Basilisk, Interlink, SeaMonkey, and other Mozilla-based software. Install styles from userstyles.org to change how web pages and the application look.
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.
Dynamically load stylesheets in Firefox from plaintext files in your profile.
superUserContent is a simple Firefox plugin that creates a new directory in your profile's chrome directory called userContent.css.d. You can use this directory as a runtime path for css styleshee.
Makeover lets you change the appearance and behavior of web pages with CSS and JavaScript. To use it, you go to a web page you want to customize, tap the Makeover icon, and paste the code into the text field.
Userscript's and userstyle's — simple extension to inject own JavaScript or CSS rules to any page.
We offer versatile and seamless customization for any website, allowing you to adjust colors, fonts, and even article widths for a more comfortable browsing experience.
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just a nice Dark Theme addon, but doesn't allow your own css, like not diplaying element, change fonts, other color than just black or dark