Stylus review
A free, open-source browser extension for applying themes and writing custom CSS.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Stylus is a free, open-source browser extension for changing how websites look with CSS themes and userstyles. It suits people who want to apply styles from galleries or write their own, especially solo users comfortable managing browser extensions. The built-in editor supports creating and editing CSS, and styles can also be installed from raw text URLs in UserCSS format. Stylus is available for Chrome and Chromium-based browsers, including Brave, Opera, and Vivaldi, as well as Firefox and Gecko-based browsers.
Its main draw is the range of ways to manage styles after installation. Stylus can automatically update installed styles, find styles for the current site from the extension, and use live reload with external editors. JSON backup and restore provide a way to move or recover styles, while optional synchronization works through Dropbox, Google Drive, OneDrive, or WebDAV-compatible servers. Those options make it a fit for people who maintain a personal collection across devices or prefer editing outside the browser; sync depends on choosing and configuring one of the supported targets.
Stylus is narrowly focused on website appearance rather than broader browser productivity. It is a good choice for users who want direct control over CSS and are willing to source or maintain styles themselves. It may be a poor fit for someone seeking a polished, managed theme catalog, non-CSS customization, or direct support: its support channel is the community. Choose it for flexible styling and control over your styles; consider another option if you need vendor-led assistance or a wider-purpose extension.
Stylus pros and cons
- Where it wins
- Find and install website themes from style galleries
- Built-in editor supports custom CSS and UserCSS from raw text URLs
- Backups, automatic updates, live reload, and multiple sync options
- Where it doesn't
- Styling is limited to browser extensions and supported browsers
- Cloud sync requires a configured Dropbox, Google Drive, OneDrive, or WebDAV target
- Support is community-based
Stylus fact sheet, pricing and score →
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