The quick brown fox jumps over the lazy dog
Segoe UI vs Calibri
Two Microsoft system sans-serifs that most people have read without noticing. Both are humanist, screen-tuned, and arrived together with Windows Vista in 2007 — but Segoe UI was built as a user-interface face for labels and menus, while Calibri was built as a text face for long reading and became the Office default for sixteen years.
Segoe UI is a commercial font, so it is shown here in Open Sans, its closest free alternative. All free alternatives to Segoe UI → Calibri is a commercial font, so it is shown here in Carlito, its closest free alternative. All free alternatives to Calibri →
The quick brown fox jumps over the lazy dog
- Segoe UI, drawn by Steve Matteson at Agfa Monotype, is Microsoft's interface font with an open, neutral look and twelve styles from Light to Black, each with an italic.
- Calibri, drawn by Lucas de Groot from 2002 to 2005, has subtly rounded stem ends that give it a warm, soft character in body copy, and ships in only three weights with italics.
- Calibri's letterforms follow traditional text proportions with a true italic and rich OpenType features like small caps, ligatures, and multiple figure styles, which suit documents more than UI chrome.
- Segoe UI was tuned for ClearType rendering and later gained a variable version in Windows 11, while Calibri has stayed a static family and lost its Office default slot to Aptos in 2023.
- Neither is free: both are bundled only with Windows and Office, and web or non-Microsoft use requires a paid license through Monotype or, for Calibri, LucasFonts.
Segoe UI
Reach for Segoe UI when you want a Windows-native interface voice for app labels, menus, dashboards, and captions, where its wide weight range and screen hinting earn their keep.
Calibri
Reach for Calibri for documents, reports, and long-form body text, where its rounded warmth and text-face proportions read comfortably for pages at a time.