The quick brown fox jumps over the lazy dog
Segoe UI vs Segoe UI Variable
Two generations of the same Microsoft system font. Segoe UI is Steve Matteson's humanist sans-serif, Microsoft's default interface face since Windows Vista in 2007, while Segoe UI Variable is the 2021 rebuild that became the Windows 11 system font. The shapes are closely related, but the newer version adds an optical-size axis that reshapes letters as text gets smaller or larger.
Segoe UI is a commercial font, so it is shown here in Open Sans, its closest free alternative. All free alternatives to Segoe UI → Segoe UI Variable is a commercial font, so it is shown here in Open Sans, its closest free alternative. All free alternatives to Segoe UI Variable →
The quick brown fox jumps over the lazy dog
- Segoe UI ships as twelve static files from Light to Black, with matching italics, and was drawn around roughly 9pt UI text.
- Segoe UI Variable packs a single file with a weight axis from Thin (100) to Bold (700) and an optical-size axis from 8pt to 36pt, exposed as Small, Text, and Display cuts.
- The optical-size axis opens up counters at small sizes for legibility and tightens outlines at display sizes for more character, which static Segoe UI cannot do.
- Segoe UI covers Arabic, Hebrew, Armenian, and Georgian alongside Latin, Greek, and Cyrillic, whereas Segoe UI Variable supports only Latin, Greek, and Cyrillic and has no italics or Black weight.
- Both are Microsoft-owned commercial fonts bundled with Windows rather than freely downloadable, so using either on the web or in a product means a Monotype license, with the open-source Selawik as the metric-compatible fallback for Segoe UI.
Segoe UI
Reach for Segoe UI when you need true italics, the heavy Black weight, or Middle Eastern and Caucasian script coverage, and when matching the Windows 10-era look is the goal.
Segoe UI Variable
Reach for Segoe UI Variable for Windows 11-native apps and any UI that mixes tiny captions with large headings, where the optical-size axis keeps both ends crisp from one file.