TYPEMATCHSEO
Launch

TYPEMATCH.

V2.1

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

Systematizing Aleo & Source Serif 4

Build a mono-category system where Aleo leads and Source Serif 4 keeps long-form content legible.

Display Face

Aleo

Weight: 700

Body Face

Source Serif 4

Weight: 400

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Aleo brings slab, semi-rounded, clean energy to hero units, pricing sections, and campaign headlines. Source Serif 4 absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its adobe, text, companion 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 Aleo & Source Serif 4

Build a mono-category system where Aleo leads and Source Serif 4 keeps long-form content legible.

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Aleo brings slab, semi-rounded, clean energy to hero units, pricing sections, and campaign headlines. Source Serif 4 absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its adobe, text, companion 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.

Aleo thrives as a headline face thanks to its slab, semi-rounded, clean qualities. Use weights 700–900 for crisp editorial lockups.
Source Serif 4 excels in paragraphs and UI thanks to its adobe, text, companion traits. Keep it between weights 400–600 for optimal readability.
Hierarchy guidance: run a 1:1.2 modular scale and reserve Aleo for H1–H3 while Source Serif 4 powers captions, body copy, and data tables.

Best-Fit Use Cases

  • High-growth SaaS landing pages that require slab hero statements with trustworthy product copy.
  • Editorial magazines and thought-leadership hubs where Aleo can dramatize pull quotes while Source Serif 4 keeps 1,500-word essays skimmable.
  • Conversion funnels or onboarding flows that need Source Serif 4's adobe voice to balance Aleo's attention-grabbing display.

Accessibility Notes

Maintain a minimum 4.5:1 contrast ratio for Source Serif 4 body copy and loosen letter-spacing to 0.01em for uppercase Aleo moments. Pairing different categories demands disciplined color pairing—test both light and dark themes to ensure Source Serif 4 does not bloom at small sizes.

CSS Implementation Cheatsheet

:root {
  --tm-header-family: 'Aleo', serif;
  --tm-body-family: 'Source Serif 4', 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 Aleo at 700 for momentum, while forms, tables, and footnotes stay on Source Serif 4 with 400 weight for predictable kerning.

FAQs

Why does Aleo make sense as the lead font?

Aleo owns the emotional register of this system. Its slab, semi-rounded, clean profile helps anchor campaign creative, meaning marketing and product teams can reuse the same voice without reinventing the scale.

Where should Source Serif 4 show up?

Source Serif 4 is the workhorse. Keep it in paragraphs, long-form editorial, knowledge bases, or anywhere legibility is non-negotiable. Its adobe, text, companion 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.