pypi.org draws its headings and body text in Source Sans 3. That is the only custom font on the page. We measured it on November 4, 2026.
The fonts pypi.org draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| Source Sans 3 | Headings, Body text | 99.5% | Open source | 17 of 845 sites (rank 6) |
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?
- Source Sans 3 is open source and free to use, including commercially. Get it from Google Fonts.
pypi.org among developer tools and infrastructure sites
pypi.org is one of the 89 developer tools and infrastructure sites we measured. Across them, Inter is the most used font you can get, on 31 of the 89 (35%). All the fonts developer tools and infrastructure sites use.
What pairing does pypi.org use?
pypi.org uses one family, Source Sans 3, for both headings and body text. So do 567 of the 845 sites we analyzed (67%). Pairings of two different fonts.
Other developer tools and infrastructure sites we measured
- npmjs.com Arimo, Poppins, Source Sans 3
- python.org Source Sans 3, Flux
- webpack.js.org Source Sans 3, Source Serif Pro
- akamai.com Instrument Sans
- algolia.com Sora, Inter
- angular.dev Inter, DM Mono
See the fonts on all 845 sites.
FAQ
What font does pypi.org use?
pypi.org draws its headings and body text in Source Sans 3. We measured it on November 4, 2026.
Is Source Sans 3 free?
Yes. Source Sans 3 is open source and free for commercial use, according to Google Fonts.
What font pairing does pypi.org use?
One family, Source Sans 3, for both headings and body text.
Can I use the same fonts as pypi.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 pypi.org. Each font's licence is on this page, from its source.
How do you know which font pypi.org uses?
We opened pypi.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.