A free font for coders by Jens Kutilek

Sudo on Mac OS X

Sudo on Windows

In 2009 I wasn’t satisfied with the available text editor fonts and decided to draw my own: Sudo. Over the last years I used it as my main font in the Terminal, as well as my text editor font for coding on Mac and Windows. Whenever something bugged me, I refined the design and could instantly evaluate if a change was an improvement.

Download Sudo for free. (364 kB zip file, desktop and web fonts.)

Source files are available on GitHub. Sudo is licensed under the SIL Open Font License.

If you are not sure yet, have a look at the glyph proof for Sudo Regular (PDF, 470 kB).

Sudo is mono­spaced

Sudo Monospaced

Why are we still using monospaced fonts for coding? I don’t know, but it’s fine by me. All letters have the same width in all weights. Proportional alternates are available for some letters via OpenType layout features.

Sudo is legible

Sudo Legible

When some letter forms are ambiguous in prosa, we can easily read them because we know the context. But when coding, all characters have to be unmistakably recognizable. It is common to add serifs to an uppercase I or a hook to the lowercase l. I don’t care very much for dotted or slashed zeroes, so I decided to make all numbers one line width smaller than the uppercase letters. They still stand out enough because most code is in lowercase anyway.

A dotted zero is included via the ‘zero’ OpenType feature, but text editor support is lacking. If you absolutely must have a dotted zero, you can use the Python script ‘’ included in the download to make the alternate zero the default form. The patcher requires an installation of the Python FontTools.

Sudo is space-efficient

Sudo Space Saving

The width of all letters is 44% of the font size. This allows you to fit more code in the same space. For example, the character width in other fonts is between 55% (Consolas) and 60% (Courier).

Sudo has been designed on a pixel grid for a font size of 16 pixels, but works well in other sizes as well.

Sudo is unique

Sudo Quotes

This is a first: As far as I know, Sudo is the first and only font to feature what we like to call ‘coder’s quotes’. Some prorgamming languages use the acute and grave accents as a replacement for opening or closing quotes. The standalone accents in Sudo are much bigger than the ones on the accented letters and work well together with the straight and typographic quotes.

Sudo has bugs!

I designed Sudo strictly for my own needs. Completist as I am, I couldn’t resist adding Greek and Cyrillic letters, but a lot of these haven’t left the pixel design stage. For me they don’t have a very high priority, sorry. If you like to work on their design, please send me any additions via GitHub.

The Bold weight is far from finished. The basic alphabet is done, but lots of less common characters are still the same as in Regular. The Italic weights are just the upright styles slanted by 8°. Don’t complain, it’s free, fix it yourself and send me pull requests.