TYPEMATCHSEO
Launch

TYPEMATCH.

V2.1

Browse Directory
700
400
PAIRING ID: SOU-LEA // ETHOS: SANS-SERIF + SANS-SERIF

Systematizing Source Sans Pro & League Spartan

Build a mono-category system where Source Sans Pro leads and League Spartan keeps long-form content legible.

Display Face

Source Sans Pro

Weight: 700

Body Face

League Spartan

Weight: 400

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Source Sans Pro brings ui-focused, legible, adobe energy to hero units, pricing sections, and campaign headlines. League Spartan absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its geometric, bold, modern texture and dependable rhythm. Together they create a typography stack that scales from high-impact landing pages to dense documentation without retooling your CSS tokens.

Typographic Hierarchy & Scale

H1The Quick Fox
H2The Quick Fox
H3The Quick Fox
PThe quick brown fox jumps over...
Dark Context
Aa

High contrast negative space.

Accent
Gg

Legibility on high-chroma.

Pairing Strategy

Systematizing Source Sans Pro & League Spartan

Build a mono-category system where Source Sans Pro leads and League Spartan keeps long-form content legible.

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Source Sans Pro brings ui-focused, legible, adobe energy to hero units, pricing sections, and campaign headlines. League Spartan absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its geometric, bold, modern texture and dependable rhythm. Together they create a typography stack that scales from high-impact landing pages to dense documentation without retooling your CSS tokens.

Source Sans Pro thrives as a headline face thanks to its ui-focused, legible, adobe qualities. Use weights 700–900 for crisp editorial lockups.
League Spartan excels in paragraphs and UI thanks to its geometric, bold, modern traits. Keep it between weights 400–600 for optimal readability.
Hierarchy guidance: run a 1:1.2 modular scale and reserve Source Sans Pro for H1–H3 while League Spartan powers captions, body copy, and data tables.

Best-Fit Use Cases

  • High-growth SaaS landing pages that require ui-focused hero statements with trustworthy product copy.
  • Editorial magazines and thought-leadership hubs where Source Sans Pro can dramatize pull quotes while League Spartan keeps 1,500-word essays skimmable.
  • Conversion funnels or onboarding flows that need League Spartan's geometric voice to balance Source Sans Pro's attention-grabbing display.

Accessibility Notes

Maintain a minimum 4.5:1 contrast ratio for League Spartan body copy and loosen letter-spacing to 0.01em for uppercase Source Sans Pro moments. Pairing different categories demands disciplined color pairing—test both light and dark themes to ensure League Spartan does not bloom at small sizes.

CSS Implementation Cheatsheet

:root {
  --tm-header-family: 'Source Sans Pro', sans-serif;
  --tm-body-family: 'League Spartan', sans-serif;
  --tm-header-weight: 700;
  --tm-body-weight: 400;
  --tm-header-tracking: -0.01em;
  --tm-body-tracking: -0.005em;
}
Heading scale: clamp(2.75rem, 3.6vw, 5.25rem) for H1, clamp(1.5rem, 2.8vw, 3rem) for H2, and keep paragraph size at 1rem–1.125rem with 1.6 line-height.
Component guidance: Buttons inherit Source Sans Pro at 700 for momentum, while forms, tables, and footnotes stay on League Spartan with 400 weight for predictable kerning.

FAQs

Why does Source Sans Pro make sense as the lead font?

Source Sans Pro owns the emotional register of this system. Its ui-focused, legible, adobe profile helps anchor campaign creative, meaning marketing and product teams can reuse the same voice without reinventing the scale.

Where should League Spartan show up?

League Spartan is the workhorse. Keep it in paragraphs, long-form editorial, knowledge bases, or anywhere legibility is non-negotiable. Its geometric, bold, modern qualities reduce fatigue on dense layouts.

Does this pairing support complex localization?

Yes—both families are available on Google Fonts with generous glyph coverage. Test cyrillic/latin accents early, but most Latin-based locales and UI patterns are fully supported.