astro.build draws its headings in Obviously and its body text in Inter. It uses 3 fonts in all. We measured it on October 21, 2026.
The fonts astro.build draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| Obviously | Headings | 61.5% | Not verified as obtainable | – |
| Inter | Body text | 30.3% | Open source | 71 of 407 sites (rank 1) |
| MD IO | Smaller text | 8.2% | Commercial | 2 of 407 sites (rank =29) |
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?
- Obviously: we could not verify that this typeface can be licensed, so we neither recommend it nor link a source.
- Inter is open source and free to use, including commercially. Get it from Google Fonts.
- MD IO is sold under a commercial licence by Mass-Driver. Licence it from Mass-Driver; copying the file from a site that uses it is not a licence.
astro.build among developer tools and infrastructure sites
astro.build 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 astro.build use?
Obviously for headings with Inter for body text does not repeat on another analyzed site, so there is no shared pairing to show. Pairings that do repeat.
Other developer tools and infrastructure sites we measured
- tailscale.com Inter, MD IO
- algolia.com Sora, Inter
- angular.dev Inter, DM Mono
- circleci.com Inter
- codesandbox.io Inter
- deno.com Inter
See the fonts on all 407 sites.
FAQ
What font does astro.build use?
astro.build draws its headings in Obviously and its body text in Inter. It uses 3 fonts in all: Obviously, Inter, MD IO. We measured it on October 21, 2026.
Is Obviously free?
We could not verify that Obviously can be licensed, so we do not state a licence.
What font pairing does astro.build use?
Obviously for headings and Inter for body text. It does not repeat on another analyzed site.
Can I use the same fonts as astro.build 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 astro.build. Each font's licence is on this page, from its source.
How do you know which font astro.build uses?
We opened astro.build 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.