SiteFontCheck

No extension free font checker analyzer for modern web design

Check fonts on popular websites

Fonts used by

qubes-os.org

Last analyzed 10/19/2026, 12:58:48 PM UTC

Curious about the design behind qubes-os.org?

SiteFontCheck scanned their live CSS architecture and identified 5 unique font families.

The website relies heavily on arial, sans-serif for its main text elements, paired with open sans bold, arial, sans-serif and ostrich heavy, arial, sans-serif as fallback options, and 2 additional.

5
unique font families
Primary font
arial, sans-serif

Below is the precise map of font sizes, weights, and text elements used across their site.

Detected Fonts

5 found

arial, sans-serif

55

What is Qubes OS?

open sans bold, arial, sans-serif

50

Download & Install

ostrich heavy, arial, sans-serif

17

Toggle navigation

open sans, arial, sans-serif

16

Version 4.3.2

ostrich medium, arial, sans-serif

14

OS

Loading preview...

About SiteFontCheck

SiteFontCheck is a powerful no extension free font checker analyzer that analyzes any website to identify and display all fonts used in real-time. Simply enter a URL and instantly discover the typography behind your favorite websites.

About SiteFontCheck

No extension free font checker analyzer for modern web design. Detect, analyze, and explore fonts across any website with our powerful, user-friendly interface.