DESIGN.md · measured October 26, 2026

Cult UI design system

Light monochrome interface measured from cult-ui.com: GeistSans type with GeistPixelSquare, tonal surfaces and 8px corners.

Background: #FAFAFA
Primary: #171717
Type: GeistSans
Corners: 8px

Download DESIGN.md

From cult-ui.com ↗ · 369 elements at 1440×900 and 390×844 · Independent analysis, not affiliated with Cult UI

Cult UI colors

15 roles measured on the page, grouped by where each color is used.

Surfaces

Snow#FAFAFAbackgroundPage background

White#FFFFFFsurface-container-lowRaised areas one step from the page · 47×

White 95%#FFFFFFF2surface-containerCards and panels · 5×

Snow#F5F5F5surface-container-highHover and pressed fills · 3×

White 15%#FFFFFF26overlayTranslucent fill for cards and controls · 1×

Snow 55%#F5F5F58Coverlay-strongStronger translucent fill · 1×

Text

Slate#666666on-surfacePrimary text and headings · 84×

Charcoal#171717on-surface-strongHeadings and emphasis · 28×

Gray#A1A1A1on-surface-variantSecondary text · 6×

White#FFFFFFon-primaryText and icons on primary

Accents

Charcoal#171717primaryPrimary buttons and calls to action · 37×

Vivid Orange#E17100secondaryMost used accent color · 14×

Borders

Mist 80%#EBEBEBCCoutlineBorders and dividers · 18×

Near Black 10%#0000001Aoutline-variantSecondary dividers · 2×

Status

Teal#00C98DsuccessSuccess and positive states · 9×

Cult UI fonts

3 families.

AaGeistSansWeights 400, 450, 500GeistSans, GeistSans Fallback

AaGeistPixelSquareWeights 400GeistPixelSquare, Geist Mono, ui-monospace, SFMono-Regular

AaGeistMonoMonospace · Weights 400GeistMono, ui-monospace, SFMono-Regular, Roboto Mono

headline-displayPage title (h1)Cult UI64px · 450 · 1.11 · -0.06em
mobile 36px

headline-lgSection headings (h2)The quick brown fox jumps over the lazy dog48px · 450 · 1 · -0.06em
mobile 24px

body-mdBody textThe quick brown fox jumps over the lazy dog16px · 400 · 1.5

body-lgLead paragraphsThe quick brown fox jumps over the lazy dog18px · 400 · 1.56 · -0.025em

body-smSecondary and small textThe quick brown fox jumps over the lazy dog10px · 400 · 1.5

label-mdButtons, navigation and labelsThe quick brown fox jumps over the lazy dog16px · 500 · 1.5

label-smSmall labels and badgesThe quick brown fox jumps over the lazy dog14px · 400 · 1.43

codeCode and technical valuesconst ready = true;10px · 400 · 1.5 · 0.05em

Contrast

Text on #FAFAFA

AaAA5.5:1

AaAAA17.2:1

AaLarge only2.5:1

Spacing

No strict grid · 74% are multiples of 4px

xs4px

sm8px

md16px

lg24px

xl64px

gutter8px

section96px

container1152px

Breakpoints: 600px 640px

Shapes

Corner radii, most used first.

sm8px · 181×

lg24px · 108×

md16px · 72×

Depth

Shadow

Components

Rebuilt from the measured CSS.

Browse 154 components

button-primaryFilled button

Show 28 more components

button-outlineOutlined button

Show 28 more components

button-ghostText button

Card

cardCard

Inline link

linkInline link

Motion

Interface transitions

0.15s0.3s

cubic-bezier(0.4, 0, 0.2, 1)ease

Do’s and don’ts

Rules written from the measurements, so a coding agent stays on style.

Use #FAFAFA for the page and lift surfaces in small steps: #FFFFFF, #FFFFFFF2, #F5F5F5.
Keep text in 3 levels: #666666, #171717, #A1A1A1.
Let contrast carry emphasis; primary actions use #171717 on #FAFAFA.
Set headlines in GeistSans with tight tracking (-0.06em).
Reuse the measured spacing steps (8px, 16px, 24px).
Use 8px corners on most elements; larger surfaces also use 24px and 16px.
Use #A1A1A1 for body text; it reaches 2.5:1 on #FAFAFA. Keep it for large text or metadata.
Introduce new font families beyond GeistSans, GeistPixelSquare and GeistMono.
Add saturated accent colors; the measured palette is almost entirely neutral.
Make interface transitions slower than 0.3s.

DESIGN.md217 lines

---
version: alpha
name: Cult UI
description: "Light monochrome interface measured from cult-ui.com: GeistSans type with GeistPixelSquare, tonal surfaces and 8px corners."
colors:
  background: "#FAFAFA"
  surface: "#FAFAFA"
  on-surface: "#666666"
  on-background: "#666666"
  on-surface-strong: "#171717"
  on-surface-variant: "#A1A1A1"
  surface-container-low: "#FFFFFF"
  surface-container: "#FFFFFFF2"
  surface-container-high: "#F5F5F5"
  overlay: "#FFFFFF26"
  overlay-strong: "#F5F5F58C"
  outline: "#EBEBEBCC"
  outline-variant: "#0000001A"
  primary: "#171717"
  on-primary: "#FFFFFF"
  secondary: "#E17100"
  success: "#00C98D"
typography:
  headline-display:
    fontFamily: GeistSans
    fontSize: 64px
    fontWeight: 450
    lineHeight: 1.11
    letterSpacing: -0.06em
  headline-lg:
    fontFamily: GeistSans
    fontSize: 48px
    fontWeight: 450
    lineHeight: 1
    letterSpacing: -0.06em
  body-md:
    fontFamily: GeistSans
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
  body-lg:
    fontFamily: GeistSans
    fontSize: 18px
    fontWeight: 400
    lineHeight: 1.56
    letterSpacing: -0.025em
  body-sm:
    fontFamily: GeistPixelSquare
    fontSize: 10px
    fontWeight: 400
    lineHeight: 1.5
  label-md:
    fontFamily: GeistSans
    fontSize: 16px
    fontWeight: 500
    lineHeight: 1.5
  label-sm:
    fontFamily: GeistSans
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.43
  code:
    fontFamily: GeistMono
    fontSize: 10px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0.05em
  headline-display-mobile:
    fontFamily: GeistSans
    fontSize: 36px
    fontWeight: 450
    lineHeight: 1.11
    letterSpacing: -0.06em
  headline-lg-mobile:
    fontFamily: GeistSans
    fontSize: 24px
    fontWeight: 450
    lineHeight: 1.33
    letterSpacing: -0.06em
rounded:
  sm: 8px
  md: 16px
  lg: 24px
spacing:
  xs: 4px
  sm: 8px
  md: 16px
  lg: 24px
  xl: 64px
  gutter: 8px
  section: 96px
  container: 1152px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-primary}"
    typography: "{typography.label-md}"
    padding: 0px 22px 0px 24px
    height: 48px
  button-outline:
    backgroundColor: "{colors.surface-container-low}"
    textColor: "{colors.on-surface-strong}"
    typography: "{typography.label-md}"
    padding: 0px 24px
    height: 48px
  button-ghost:
    typography: "{typography.label-md}"
    padding: 0px 24px
  card:
    typography: "{typography.body-md}"
    rounded: 32px
    padding: 0px
  link:
    textColor: "{colors.on-surface}"
---

# Cult UI Design System

## Overview

Cult UI describes itself as: “Open-source Shadcn UI components, animated blocks, and full templates you can copy-paste into any TypeScript/Next.js project.” The interface is light, built on **Snow (#FAFAFA)** with **Slate (#666666)** text and almost no color: actions are carried by contrast, not hue.

Type is set in **GeistSans** and **GeistPixelSquare**, with **GeistMono** for code. Headlines run large with tight negative tracking; body text is 16px. Depth comes from soft drop shadows. Corners are mostly 8px.

Measured from [cult-ui.com](https://www.cult-ui.com/) on October 26, 2026 at 1440×900 and 390×844 from 369 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 15 roles.

- **Snow (#FAFAFA):** Page background. Token `background`.
- **Slate (#666666):** Primary text and headings, seen 84 times. Token `on-surface`.
- **Charcoal (#171717):** Headings and emphasis, seen 28 times. Token `on-surface-strong`.
- **Gray (#A1A1A1):** Secondary text, seen 6 times. Token `on-surface-variant`.
- **White (#FFFFFF):** Raised areas one step from the page, seen 47 times. Token `surface-container-low`.
- **White 95% (#FFFFFFF2):** Cards and panels, seen 5 times. Token `surface-container`.
- **Snow (#F5F5F5):** Hover and pressed fills, seen 3 times. Token `surface-container-high`.
- **White 15% (#FFFFFF26):** Translucent fill for cards and controls, seen 1 time. Token `overlay`.
- **Snow 55% (#F5F5F58C):** Stronger translucent fill, seen 1 time. Token `overlay-strong`.
- **Mist 80% (#EBEBEBCC):** Borders and dividers, seen 18 times. Token `outline`.
- **Near Black 10% (#0000001A):** Secondary dividers, seen 2 times. Token `outline-variant`.
- **Charcoal (#171717):** Primary buttons and calls to action, seen 37 times. Token `primary`.
- **White (#FFFFFF):** Text and icons on primary. Token `on-primary`.
- **Vivid Orange (#E17100):** Most used accent color, seen 14 times. Token `secondary`.
- **Teal (#00C98D):** Success and positive states, seen 9 times. Token `success`.

## Typography

**GeistSans**, **GeistPixelSquare** and **GeistMono** (monospace) share the interface. Fallback stack: `GeistSans, GeistSans Fallback`.

- **headline-display:** GeistSans 64px at weight 450, line height 1.11, tracking -0.06em (36px on mobile). Page title (h1).
- **headline-lg:** GeistSans 48px at weight 450, line height 1, tracking -0.06em (24px on mobile). Section headings (h2).
- **body-md:** GeistSans 16px at weight 400, line height 1.5. Body text.
- **body-lg:** GeistSans 18px at weight 400, line height 1.56, tracking -0.025em. Lead paragraphs.
- **body-sm:** GeistPixelSquare 10px at weight 400, line height 1.5. Secondary and small text.
- **label-md:** GeistSans 16px at weight 500, line height 1.5. Buttons, navigation and labels.
- **label-sm:** GeistSans 14px at weight 400, line height 1.43. Small labels and badges.
- **code:** GeistMono 10px at weight 400, line height 1.5, tracking 0.05em. Code and technical values.

## Layout

Spacing is mostly on a 4px grid (74% of measured values), with some off-grid steps. Match the measured scale rather than rounding everything.

- **Scale:** xs 4px, sm 8px, md 16px, lg 24px, xl 64px.
- **Sections:** 96px vertical padding between major sections.
- **Gaps:** 8px is the most common gap in flex and grid layouts.
- **Container:** content is capped at 1152px.
- **Breakpoints:** 600px, 640px.

## Elevation & Depth

Raised elements use soft drop shadows. The most used recipes:

- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.06) 0px 0px 0px 1px, rgba(0, 0, 0, 0.06) 0px 1px 2px -1px, rgba(0, 0, 0, 0.04) 0px 2px 4px 0px`
- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 0px 0px 1px, rgba(0, 0, 0, 0.04) 0px 1px 2px 0px`
- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 1px 1px 0px, rgba(255, 252, 240, 0.5) 0px 1px 1px 0px inset, rgba(255, 255, 255, 0.1) 0px 0px 0px 1px inset, rgba(28, 27, 26, 0.5) 0px 0px 1px 0px`

## Shapes

Most elements use 8px corners. Measured radii, most used first:

- **sm (8px):** 181 elements.
- **lg (24px):** 108 elements.
- **md (16px):** 72 elements.

## Components

Measured from the rendered page. Token values reference the tokens above.

- **button-primary (“Browse 154 components”):** #171717 fill, #FFFFFF text, 16px/500, 3.35544e+07px radius, padding 0px 22px 0px 24px.
- **button-outline (“Show 28 more components”):** #FFFFFF fill, #171717 text, 16px/500, 3.35544e+07px radius, padding 0px 24px, shadow `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.06) 0px 0px 0px 1px, rgba(0, 0, 0, 0.06) 0px 1px 2px -1px, rgba(0, 0, 0, 0.04) 0px 2px 4px 0px`.
- **button-ghost (“Show 28 more components”):** transparent fill, 16px/500, 3.35544e+07px radius, padding 0px 24px, shadow `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.06) 0px 0px 0px 1px, rgba(0, 0, 0, 0.06) 0px 1px 2px -1px, rgba(0, 0, 0, 0.04) 0px 2px 4px 0px`.
- **card:** transparent fill, 16px/400, 32px radius, padding 0px, shadow `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.06) 0px 0px 0px 1px, rgba(0, 0, 0, 0.06) 0px 1px 2px -1px, rgba(0, 0, 0, 0.04) 0px 2px 4px 0px`.
- **link:** transparent fill, #666666 text, padding 0px.

## Do's and Don'ts

- Do use #FAFAFA for the page and lift surfaces in small steps: #FFFFFF, #FFFFFFF2, #F5F5F5.
- Do keep text in 3 levels: #666666, #171717, #A1A1A1.
- Do let contrast carry emphasis; primary actions use #171717 on #FAFAFA.
- Do set headlines in GeistSans with tight tracking (-0.06em).
- Do reuse the measured spacing steps (8px, 16px, 24px).
- Do use 8px corners on most elements; larger surfaces also use 24px and 16px.
- Don't use #A1A1A1 for body text; it reaches 2.5:1 on #FAFAFA. Keep it for large text or metadata.
- Don't introduce new font families beyond GeistSans, GeistPixelSquare and GeistMono.
- Don't add saturated accent colors; the measured palette is almost entirely neutral.
- Don't make interface transitions slower than 0.3s.

## Motion

Interface transitions are quick: 0.15s, 0.3s.

- **Easing:** `cubic-bezier(0.4, 0, 0.2, 1)`, `ease`, `cubic-bezier(0, 0, 0.2, 1)`.
- **Reduced motion:** the page responds to `prefers-reduced-motion`.

Generated by [Sitepeel](https://sitepeel.dev/design-md/cult-ui.com/), the free DESIGN.md generator.

What you can build with it

Landing pages, pricing tables, dashboards: your AI coding agent builds them in this style, with these colors, fonts, spacing and buttons instead of its defaults.

Download DESIGN.md, put it in your project’s root folder, then ask your agent for a page.

Prompt · DESIGN.md attached

Build a landing page for my product. Follow for every color, font, spacing value, corner and button.

Guides

Need more than one page?

Design MD in the Sitepeel tools for Chrome measures pages behind a login, combines several pages into one file and works on any site you open.

Explore the tool

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FAQ

Questions

What can I build with the Cult UI DESIGN.md?

Any page or component in this style: a landing page, pricing table, dashboard or sign-up form. Your AI coding agent uses the measured colors, GeistSans type, spacing, corners and buttons instead of its own defaults.

How do I use it with Claude Code or Cursor?

Download the file and put it in your project’s root folder, then ask your agent to follow DESIGN.md. Step-by-step guides: Claude Code, Cursor, Codex, GitHub Copilot.

Is this Cult UI’s official design system?

No. Sitepeel measured it from cult-ui.com’s public page on October 26, 2026. It is an independent analysis, not made or approved by Cult UI.

Can I use Cult UI’s style in my own product?

Use it to learn, prototype and compare. For a real product, make the style your own, and never copy Cult UI’s logo, name, pictures or text.

How accurate are the values?

Each value was measured on the rendered page after it fully loaded, on desktop and mobile: colors where they appear, type with tracking, spacing, corners, shadows and hover states. Sites change, so check the date at the top.