brilliant.org draws its headings in CoFo Robert and its body text in CoFo Brilliant. It uses 2 fonts in all. We measured it on October 21, 2026.
The fonts brilliant.org draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| CoFo Brilliant | Body text | 96.9% | Company typeface, not verified as obtainable | – |
| CoFo Robert | Headings | 3.1% | 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?
- CoFo Brilliant: 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.
- CoFo Robert: we could not verify that this typeface can be licensed, so we neither recommend it nor link a source.
brilliant.org among education sites
brilliant.org is one of the 15 education sites we measured. Across them, Inter is the most used font you can get, on 2 of the 15 (13%). All the fonts education sites use.
What pairing does brilliant.org use?
CoFo Robert for headings with CoFo Brilliant for body text does not repeat on another analyzed site, so there is no shared pairing to show. Pairings that do repeat.
Other education sites we measured
- babbel.com Graphik, Feature Text LC
- cam.ac.uk Lato, Open Sans
- codecademy.com Apercu Pro
- coursera.org Source Sans 3
- duolingo.com Duolingo Sans
- edx.org Inter
See the fonts on all 407 sites.
FAQ
What font does brilliant.org use?
brilliant.org draws its headings in CoFo Robert and its body text in CoFo Brilliant. It uses 2 fonts in all: CoFo Brilliant, CoFo Robert. We measured it on October 21, 2026.
Is CoFo Robert free?
We could not verify that CoFo Robert can be licensed, so we do not state a licence.
What font pairing does brilliant.org use?
CoFo Robert for headings and CoFo Brilliant for body text. It does not repeat on another analyzed site.
Can I use the same fonts as brilliant.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 brilliant.org. Each font's licence is on this page, from its source.
How do you know which font brilliant.org uses?
We opened brilliant.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.