Mona Sans is a strong and versatile typeface inspired by industrial-era grotesques. We designed it in collaboration with Degarism to work as our primary font across mediums, and with its variable width and weight, Mona Sans works well and stays expressive across product, web, and print. You can see it in use on our more marketing-oriented pages on GitHub (like /home and /features/copilot), at GitHub Universe. We use it for everything from body text to headers and pull-quotes.
Mona Sans is one of two variable open source fonts from GitHub. The other one is its robotic sidekick, Hubot Sans. Both were recently made available under the Open Font License (OFL).
The font used for code is specified in the CSS as “ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace”. That is, the website will be rendered in the monospaced UI font that’s available on the user’s operating system. The font shown in the images below is Menlo.
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Mona Sans appears to be an evolution of Alliance No.1, with Hubot Sans being based on Alliance No.2. These two typefaces, also designed by Degarism Studio, were already used on the GitHub website in 2021, see this post: