TYPEMATCHSEO
Launch

TYPEMATCH.

V2.1

Browse Directory
700
400
PAIRING ID: SLA-CAS // ETHOS: DISPLAY + SERIF

Balancing Slackey with Castoro

Anchor the expressive personality of Slackey with the utilitarian clarity of Castoro.

Display Face

Slackey

Weight: 700

Body Face

Castoro

Weight: 400

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Slackey brings chunky, fun, kids energy to hero units, pricing sections, and campaign headlines. Castoro absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its text, academic, readable 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

Balancing Slackey with Castoro

Anchor the expressive personality of Slackey with the utilitarian clarity of Castoro.

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Slackey brings chunky, fun, kids energy to hero units, pricing sections, and campaign headlines. Castoro absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its text, academic, readable 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.

Slackey thrives as a headline face thanks to its chunky, fun, kids qualities. Use weights 400–600 for crisp editorial lockups.
Castoro excels in paragraphs and UI thanks to its text, academic, readable traits. Keep it between weights 400–600 for optimal readability.
Hierarchy guidance: run a 1:1.4 modular scale and reserve Slackey for H1–H3 while Castoro powers captions, body copy, and data tables.

Best-Fit Use Cases

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

Accessibility Notes

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

CSS Implementation Cheatsheet

:root {
  --tm-header-family: 'Slackey', display;
  --tm-body-family: 'Castoro', serif;
  --tm-header-weight: 400;
  --tm-body-weight: 400;
  --tm-header-tracking: -0.04em;
  --tm-body-tracking: 0em;
}
Heading scale: clamp(2.75rem, 4.5vw, 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 Slackey at 400 for momentum, while forms, tables, and footnotes stay on Castoro with 400 weight for predictable kerning.

FAQs

Why does Slackey make sense as the lead font?

Slackey owns the emotional register of this system. Its chunky, fun, kids profile helps anchor campaign creative, meaning marketing and product teams can reuse the same voice without reinventing the scale.

Where should Castoro show up?

Castoro is the workhorse. Keep it in paragraphs, long-form editorial, knowledge bases, or anywhere legibility is non-negotiable. Its text, academic, readable 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.