claude.ai draws its headings and body text in Anthropic Sans Text. It uses 2 fonts in all. We measured it on November 4, 2026.
The fonts claude.ai draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| Anthropic Sans Text | Headings, Body text | 96.4% | Company typeface, not verified as obtainable | – |
| Anthropic Serif Text | Smaller text | 3.6% | Company typeface, not verified as obtainable | – |
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?
- Anthropic Sans Text: we could not verify that this typeface can be licensed, and it carries the name of the company that uses it, so we neither recommend it nor link a source.
- Anthropic Serif Text: we could not verify that this typeface can be licensed, and it carries the name of the company that uses it, so we neither recommend it nor link a source.
claude.ai among ai sites
claude.ai is one of the 62 ai sites we measured. Across them, Inter is the most used font you can get, on 10 of the 62 (16%). All the fonts ai sites use.
What pairing does claude.ai use?
claude.ai uses one family, Anthropic Sans Text, for both headings and body text. So do 567 of the 845 sites we analyzed (67%). Pairings of two different fonts.
Other ai sites we measured
- anthropic.com Anthropic Sans Text, Anthropic Serif Text
- ai21.com Aeonik, Söhne, Inter
- anyscale.com Geist Mono, Geist
- assemblyai.com UN 11 ST, Oceanic Text
- bolt.new Schibsted Grotesk
- character.ai Open Sans, At Hauss
See the fonts on all 845 sites.
FAQ
What font does claude.ai use?
claude.ai draws its headings and body text in Anthropic Sans Text. It uses 2 fonts in all: Anthropic Sans Text, Anthropic Serif Text. We measured it on November 4, 2026.
Is Anthropic Sans Text free?
We could not verify that Anthropic Sans Text can be licensed, so we do not state a licence. It carries the name of the company that uses it, which usually means a custom house font.
What font pairing does claude.ai use?
One family, Anthropic Sans Text, for both headings and body text.
Can I use the same fonts as claude.ai 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 claude.ai. Each font's licence is on this page, from its source.
How do you know which font claude.ai uses?
We opened claude.ai 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.