---
version: alpha
name: Slack
description: Light design system extracted from slack.com (DOM-true values, Emblematic extractor 0.2.0, 2026-11-12).
colors:
  background: "#FFFFFF"
  on-surface: "#000000"
  on-surface-variant: "#181818"
  primary: "#730394"
  outline: "#F3F3F3"
  article-theme-primary: "#481A54"
  color-7: "#F9F0FF"
  color-8: "#00000080"
  color-9: "#5C5C5C"
  color-10: "#FFFFFF80"
  color-11: "#9602C7"
  on-primary: "#FFFFFF"
typography:
  display-lg:
    fontFamily: Salesforce Avant Garde
    fontSize: 64px
    fontWeight: 700
    lineHeight: 1.063
    letterSpacing: -0.012em
  headline-md:
    fontFamily: Salesforce Avant Garde
    fontSize: 32px
    fontWeight: 700
    lineHeight: 1.25
    letterSpacing: -0.012em
  title-md:
    fontFamily: Salesforce Avant Garde
    fontSize: 24px
    fontWeight: 700
    lineHeight: 1.25
    letterSpacing: -0.004em
  body-md:
    fontFamily: Salesforce Sans
    fontSize: 18px
    fontWeight: 400
    lineHeight: 1.555
    letterSpacing: -0.001em
  body-sm:
    fontFamily: Salesforce Sans
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.555
    letterSpacing: -0.001em
  label-md:
    fontFamily: Salesforce Sans
    fontSize: 16px
    fontWeight: 700
    lineHeight: 1.5
rounded:
  sm: 4px
  md: 16px
  full: 9999px
spacing:
  xxs: 4px
  xs: 6px
  sm: 7px
  md: 8px
  lg: 10px
  xl: 12px
  2xl: 16px
  3xl: 18px
  4xl: 20px
  5xl: 24px
  6xl: 32px
  7xl: 40px
  8xl: 96px
  9xl: 105px
  container: 1230px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.background}"
    rounded: "{rounded.sm}"
    padding: 12px
    height: 42px
    typography: "{typography.label-md}"
  card:
    backgroundColor: "{colors.background}"
    rounded: "{rounded.md}"
    padding: 0px
---

# Slack

> Extracted from [https://slack.com/intl/en-gb/](https://slack.com/intl/en-gb/) on 2026-11-12 by Emblematic. Every value below was read from the rendered DOM (computed styles, `document.fonts`, and the fonts Chrome actually used to paint text), not estimated from pixels. When the YAML front matter and this prose disagree, the YAML wins. Copy values from this file exactly; don't transcribe them from memory. Don't copy logos, imagery, illustrations or marketing copy.

## Overview

Slack uses a light canvas (#FFFFFF) with a palette led by #730394. Type is set in **Salesforce Avant Garde** (display), **Salesforce Sans**, with 18px body text. Layout: 1230px container, top-fixed+transparent navigation, 10 sections. Built with jquery, google-tag-manager.

## Colors

Area-weighted from painted backgrounds, text and borders on the 1440px light capture. Roles are inferred from usage (largest background, most text, interactive fills). Every hex is an exact computed value; a role marked *unverified* is a best guess that has not passed review, so its canonical token (e.g. `primary`) is left out of the front matter.

| Token | Hex | OKLCH | Role | Share of paint | CSS variable |
|---|---|---|---|---|---|
| `background` | `#FFFFFF` | 1 0 0 | bg | 71.6% | `--article-theme-secondary` |
| `on-surface` | `#000000` | 0 0 0 | text | 3.8% | `--attachment-color` |
| `on-surface-variant` | `#181818` | 0.209 0 0 | muted | 3.1% | — |
| `primary` | `#730394` | 0.416 0.202 315.3 | accent | 0.33% | — |
| `outline` | `#F3F3F3` | 0.964 0 0 | border | 0.04% | — |
| `article-theme-primary` | `#481A54` | 0.316 0.109 318.7 | other | 13.9% | `--article-theme-primary` |
| `color-7` | `#F9F0FF` | 0.966 0.022 312.2 | other | 3.5% | — |
| `color-8` | `#00000080` (on bg `#808080`) | 0 0 0 | other | 1.1% | — |
| `color-9` | `#5C5C5C` | 0.475 0 0 | other | 0.79% | — |
| `color-10` | `#FFFFFF80` (on bg `#FFFFFF`) | 1 0 0 | other | 0.54% | — |
| `color-11` | `#9602C7` | 0.508 0.252 313.5 | other | 0.31% | — |

Sparse chromatic highlights (not accents): `#481A54` (`--article-theme-primary`), `#9602C7`.

Declared brand/accent tokens: `--article-theme-primary` = `#481A54`.

Contrast: text on background 21:1, muted text 17.76:1, accent 9.68:1.

Gradients in use: `linear-gradient(rgb(249, 240, 255) 5%, rgb(255, 255, 255) 10%)`; `linear-gradient(rgba(24, 24, 24, 0) 22.75%, rgba(24, 24, 24, 0.06) 28.48%, rgba(24, 24, 24, 0.12) 34.34%, rgba(24, 24, 24, 0.25) 42.06%, rgb`.

The site does not change under `prefers-color-scheme: dark`.

## Typography

| Family | Role | Weights | Share of text | Source |
|---|---|---|---|---|
| **Salesforce Avant Garde** (CSS: `Salesforce-Avant-Garde`) | display | 400, 600, 700 | 61.1% | webfont |
| **Salesforce Sans** (CSS: `Salesforce-Sans`) | body | 300, 400, 700 | 38.9% | webfont |

Declared in `@font-face` but not used to paint text on this page: Noto Sans JP, Noto Sans KR, Noto Sans SC, Noto Sans TC, M Xiang He Hei SC Pro Bold, M Xiang He Hei TC Bold. Don't treat these as the page's fonts.

Scale (px): 12, 14, 15, 16, 18, 22, 24, 32, 50, 64. Effective ratio ≈ 1.289 (close to a major third). Body 18px at line-height 1.555; display 64px with tracking -0.012em. Headings are sentence case. On a 390px viewport the body is 18px and display 32px.

## Layout

Spacing has no reliable single base unit; the most used steps are 4, 6, 7, 8, 10, 12, 16, 18, 20, 24, 32, 40, 96, 105px. Sections open with about 56px of space before their first line of text. Content sits in a 1230px container on a 5-column grid. Text density 0.108 (text area / page area).

Section order (desktop). Kinds below the review threshold are shown as *section*:

1. **nav** (80px, bg #FFFFFF)
2. **hero** — “All your people and AI agents working together” (3603px, bg #FFFFFF)
3. **section** (2841px, bg #FFFFFF)
4. **testimonials** (1034px, bg #FFFFFF)
5. **logos** — “The most innovative companies run their business in Slack” (801px, bg #FFFFFF)
6. **section** — “We’re in the business of growing businesses” (390px, bg #481A54)
7. **section** — “Millions of people love working in Slack” (728px, bg #FFFFFF)
8. **testimonials** — “Your Slack deep dive starts here” (914px, bg #FFFFFF)
9. **footer** — “See all you can accomplish in Slack” (384px, bg #481A54)
10. **footer** (968px, bg #FFFFFF)

## Elevation & Depth

Style: elevated. Most used shadows:

- `rgba(0, 0, 0, 0.1) 0px 0px 16px 0px`
- `rgba(24, 24, 24, 0.1) 0px 0px 32px 0px`

## Shapes

Dominant corner radius 16px; radii in use: 4px, 16px, pill. Borders: hairline (1px).

## Components

- **button-primary**: backgroundColor `#730394`, textColor `#FFFFFF`, rounded `4px`, padding `12px 16px`, height `42px`, fontFamily `Salesforce Sans`, fontSize `14px`, fontWeight `700` (e.g. “Get started”)
- **card**: rounded `16px`, padding `0px`, backgroundColor `#FFFFFF`, border `1px solid #F3F3F3`

## Do's and Don'ts

- Do reserve `#730394` for primary actions and highlights; it covers only 0.33% of the painted page.
- Do set body copy in Salesforce Sans at 18px / 1.555.
- Do use Salesforce Avant Garde only for display sizes, not for body text.
- Do tighten large headlines (-0.012em at 64px).
- Don't introduce font weights beyond 300, 400, 600, 700.
- Do keep corners at 16px for most controls, and use the larger radii only for cards and media.
- Don't copy this site's logos, illustrations, photography or copy; use the system, not the brand assets.

## Provenance

Spec v2, extractor 0.2.0. Render quality: **ok**. Vision pass: not run. Fields below confidence 0.7 are hedged or left out above: `color.accent_strategy`, `layout.columns`, `layout.hero`, `layout.section_count`, `space.base`, `space.section_padding_px`. Full per-field provenance is in `spec.json`.