typescriptlang.org draws its headings and body text in Segoe UI and its code in Cascadia Mono. It uses 2 fonts in all. We measured it on October 21, 2026.
The fonts typescriptlang.org draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| Segoe UI | Headings, Body text | 64.5% | Not verified as obtainable | – |
| Cascadia Mono | Code | 35.5% | Open source | 1 of 407 sites (rank =54) |
Share is how much of the page’s custom-font text each font draws. System fonts and icon fonts are never counted. Each site was opened twice in a real browser and Chrome was asked which font file drew each piece of text. We count a font for a site only if both runs saw it and it drew at least 2% of the site’s custom-font text. The full method.
Can I use the same fonts?
- Segoe UI: we could not verify that this typeface can be licensed, so we neither recommend it nor link a source.
- Cascadia Mono is open source and free to use, including commercially. Get it from Google Fonts.
typescriptlang.org among developer tools and infrastructure sites
typescriptlang.org is one of the 62 developer tools and infrastructure sites we measured. Across them, Inter is the most used font you can get, on 25 of the 62 (40%). All the fonts developer tools and infrastructure sites use.
What pairing does typescriptlang.org use?
typescriptlang.org uses one family, Segoe UI, for both headings and body text. So do 280 of the 407 sites we analyzed (69%). Pairings of two different fonts.
Other developer tools and infrastructure sites we measured
- algolia.com Sora, Inter
- angular.dev Inter, DM Mono
- astro.build Obviously, Inter, MD IO
- auth0.com Aeonik, Aeonik Mono
- aws.amazon.com Amazon Ember, Amazon Ember Mono
- bun.sh Martian Mono, Archivo
See the fonts on all 407 sites.
FAQ
What font does typescriptlang.org use?
typescriptlang.org draws its headings and body text in Segoe UI and its code in Cascadia Mono. It uses 2 fonts in all: Segoe UI, Cascadia Mono. We measured it on October 21, 2026.
Is Segoe UI free?
We could not verify that Segoe UI can be licensed, so we do not state a licence.
What font pairing does typescriptlang.org use?
One family, Segoe UI, for both headings and body text.
Can I use the same fonts as typescriptlang.org on my own site?
Only if the licence allows it. Free and open-source fonts can be used freely. Commercial fonts need your own licence, even though you can see the file on typescriptlang.org. Each font's licence is on this page, from its source.
How do you know which font typescriptlang.org uses?
We opened typescriptlang.org in a real browser and asked Chrome which font file drew each piece of text, twice in separate sessions. A font counts only if both runs saw it and it drew at least 2% of the site's custom-font text.
Can I check a different website?
Yes. Paste its address into the free font finder.