Font Blend

Use case guide

Best Fonts for Developer Documentation

Developer documentation needs readable body text and legible code blocks. Body text is read for ten minutes at a stretch, code blocks need to stay sharp at 13px, and headings need to anchor long pages without shouting. These five open-source fonts cover that spread: Inter and Source Sans 3 for body, JetBrains Mono for code, IBM Plex Sans and Work Sans as alternatives.

The Fonts

Inter
sans-serifvariable9 weightsx-height: high
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Inter: the quick brown fox jumps over the lazy dog

Inter is a workhorse sans-serif designed specifically for computer screens. Its tall x-height and open counters make it exceptionally legible at small sizes, which is why it has become the default for modern UI design.

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Source Sans 3
sans-serifvariable8 weightsx-height: high
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Source Sans 3: the quick brown fox jumps over the lazy dog

Source Sans 3 is Adobe's open-source UI sans-serif, designed for legibility in user interfaces. The '3' denotes a redesigned, more neutral cut.

documentationwebsiteappsaas
JetBrains Mono
monospacevariable8 weightsx-height: high
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JetBrains Mono: the quick brown fox jumps over the lazy dog

JetBrains Mono is a monospace designed for developers, with increased x-height, code-specific ligatures, and 138 special symbols.

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Work Sans
sans-serifvariable9 weightsx-height: high
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Work Sans: the quick brown fox jumps over the lazy dog

Work Sans is a grotesque sans-serif optimized for screen body text, with a generous x-height and slightly condensed forms.

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IBM Plex Sans
sans-serif7 weightsx-height: high
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IBM Plex Sans: the quick brown fox jumps over the lazy dog

IBM Plex Sans is a humanist sans-serif designed by IBM as a corporate typeface. It has a neutral, technical character suited to documentation and enterprise UI.

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Recommended pairings for documentation

Source Serif 4 + Inter

Source Serif 4 headings over Inter body, a quiet, professional pairing that scales from documentation to long-form articles. Both fonts have optical-size axes, so headings retain their crispness at any scale.

contrast 78/100/Serif + Sans

Space Grotesk + JetBrains Mono

Space Grotesk headlines over JetBrains Mono body, a developer-forward pairing. Both have technical character; the sans-mono contrast signals 'for developers.'

contrast 76/100/Sans + Monospace

DM Sans + Source Serif 4

DM Sans headlines over Source Serif 4 body, a clean, modern editorial pairing. Calm geometric sans up top; stable serif below.

contrast 78/100/Sans + Serif

What Developer Documentation Needs from Typography

Dev docs need three things from typography. First, body text that sustains long-form technical reading, with a tall x-height, open counters, and a 16px base size at a 1.6 line-height. Second, code blocks that stay sharp at 13px to 15px with consistent weight across syntax-highlight colors. Third, a type scale that anchors a page: H2 sections that lead the eye, H3 subsections that organize within sections, inline code that pops without breaking the line. Most dev docs sites use a sans-serif body and a monospace code font. A third font for headings is optional.

Inter and Source Sans 3 for Body and UI

Inter is the strongest body font for developer documentation. It was designed for screens, has a tall x-height, and ships as a variable font from 100 to 900. Use Inter at 400 for body, 500 for UI labels, 600 for inline subheadings, and 700 for H2 section anchors. The character is neutral and technical, which matches the audience. Source Sans 3 is the Adobe alternative. It has a slightly warmer, more humanist character than Inter, with the same tall x-height and variable weight range. Pick Source Sans 3 if Inter feels too clinical for the brand voice.

JetBrains Mono for Code Blocks and Inline Code

JetBrains Mono is the recommended monospace font for dev docs. It is a variable font from 100 to 800 with programming ligatures and a tall x-height that stays readable in code blocks at 13px. Use JetBrains Mono at 400 weight for code blocks (do not bold keywords, the syntax colors do the work), and at 0.875em size for inline code so it matches the body Inter visual size. JetBrains Mono ships OFL-1.1, which means it is free for commercial use. The font has live ligature previews and the recommended weights on its font page.

IBM Plex Sans and Work Sans as Alternatives

IBM Plex Sans is the alternative body font for developer documentation that wants a more technical, branded character. It is part of the IBM Plex superfamily (Sans, Serif, Mono), so you can pair it with IBM Plex Mono for code and keep the whole system within one family. IBM Plex Sans has a slightly industrial feel that suits enterprise and infrastructure documentation. Work Sans is the alternative for a warmer, more readable body. It was designed by Wei Huang for screen reading, has a tall x-height, and works well at 14px to 16px. Pick Work Sans if the docs are aimed at a non-technical reader (end-user docs, marketing-adjacent docs).

Two Families, One Rule

The whole docs setup comes down to one rule: the prose face and the code face never trade jobs. The body font handles every word that is not code, and the monospace font handles every word that is. When a new component needs a font, it draws from one of those two stacks, and the page stays consistent without needing a style guide paragraph.

Test These Fonts Live

Every font above can be previewed live in the Font Blend tools. Pick one and test it against a real layout before you commit.

Typography playground Pairing generator All fonts

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