Stylus
Stylus: A free, open-source browser extension for applying themes and writing custom CSS. Ranked #17 of 19 in Browser Extensions by our editors (7.0/10); pricing: Free plan; best for custom CSS themes and website styling.
At a glance
- Editor score7.0 / 10
- PricingFree plan
- Best forCustom CSS themes and website styling
- Free planYes
- Paid fromFree
- Supported browsersChrome, Chromium-based browsers (including Brave, Opera, and Vivaldi), Firefox, and Gecko-based browsers
- Facts checked24 Sep 2026
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
Our verdict on Stylus
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.
Your product? Our editors can test Stylus in depth and publish a review, labelled as paid · from $149/mo →
Stylus pricing
Stylus fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Supported browsers | Chrome, Chromium-based browsers (including Brave, Opera, and Vivaldi), Firefox, and Gecko-based browsers |
| Open source | Yes |
| Works offline | Not verified |
| Mobile extension | Not verified |
| Cross-device sync | Yes |
| Deployment | Browser extension |
| Platforms | Chrome extension |
| Support | Community |
| Built for | Solo (editorial estimate) |
| Integrations | 4 integrations: Dropbox, Google Drive, OneDrive, WebDAV-compatible servers |
| Pricing | Free plan |
| Website | add0n.com |
| Facts checked | 24 Sep 2026 |
Stylus integrations
Stylus lists 4 integrations on its own site.
- Dropbox
- Google Drive
- OneDrive
- WebDAV-compatible servers
Alternatives to Stylus
- GhosteryA free, open-source browser extension with broad blocking controls and tracker reports.9.4
- Adblock PlusA free ad blocker with filter-list controls and paid tools for hiding cookie pop-ups.9.2
- uBlock OriginDeep filter-list and custom-rule controls, with browser availability varying by channel.9.1
Also Ranked In
Stylus is ranked in 2 of our directories.
Used Stylus? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Stylus for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Stylus is listed in our Browser Extensions directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/stylus/"><img src="https://www.itechguides.com/best/badge/stylus.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update