# Plausible design system

> Plausible design system measured from plausible.io: #5850EC primary on #F9FAFB, 14 color hex codes, type scale, spacing and a free DESIGN.md.

Canonical page: https://sitepeel.dev/design-md/plausible.io/

Plausible’s website (plausible.io) uses the visitor’s system fonts and #5850EC as its main color on a #F9FAFB background. Measured by Sitepeel on November 4, 2026.

## What font does Plausible use?

Plausible uses the visitor’s system fonts on plausible.io: no web font was measured. Measured on November 4, 2026.

- system-ui (weights 400, 500, 600, 800)

## Plausible colors: palette and hex codes

Plausible’s main colors are #F9FAFB (snow) for the background, #4B5563 (dark blue) for text and #5850EC (vivid indigo) as the main accent, with #3182CE (blue) and #0E9F6E (dark teal) as other accents. Measured on November 4, 2026.

- #F9FAFB: snow
- #4B5563: dark blue
- #161E2E: deep blue
- #6B7280: cool slate
- #9FA6B2: blue
- #FFFFFF: white
- #EEF1F6: cool mist
- #FACA15: vivid amber

## What is Plausible built with?

Plausible’s website (plausible.io) is built with Jekyll, Alpine.js and bunny.net. Measured on November 4, 2026.

- Site builder & CMS: Jekyll 3.9.2
- Hosting & CDN: bunny.net
- Analytics: Plausible
- JavaScript framework: Alpine.js

## Questions and answers

### What font does Plausible use?

No web font was measured on plausible.io: it uses the visitor’s system fonts.

### What are the Plausible colors and hex codes?

On plausible.io: #F9FAFB (snow) for the background, #4B5563 (dark blue) for text and #5850EC (vivid indigo) as the main accent, with #3182CE (blue) and #0E9F6E (dark teal) as other accents. The color palette above lists all 14 colors with their hex codes and where each one is used.

### What is the Plausible design system?

The design system on this page is plausible.io’s, as measured on November 4, 2026: #5850EC as the main color, 6px corners and a 4px spacing grid, written down as a DESIGN.md. It is not Plausible’s own documentation.

### What is Plausible built with?

Plausible’s website (plausible.io) is built with Jekyll, Alpine.js and bunny.net. The full tech stack Sitepeel found: Jekyll, bunny.net, Plausible and Alpine.js. Measured on November 4, 2026.

### What is the Plausible DESIGN.md?

A plain-text file with Plausible’s measured colors, type, spacing, corners and components as tokens, plus short rules, in the DESIGN.md format Google published with Stitch. Your AI coding agent reads it and builds in this style. More about DESIGN.md.

### 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 Plausible’s official design system?

No. Sitepeel measured it from plausible.io’s public page on November 4, 2026. It is an independent analysis, not made or approved by Plausible.

### Can I use Plausible’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 Plausible’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.

## Files

- [DESIGN.md](https://sitepeel.dev/design-md/plausible.io/DESIGN.md): the plain file to put in your project.
- [All brand DESIGN.md files](https://sitepeel.dev/design-md/examples/index.md)

Independent analysis by Sitepeel (sitepeel.dev), not affiliated with Plausible.

## The DESIGN.md file

```markdown
---
version: alpha
name: Plausible
description: "Light interface measured from plausible.io: system-ui type, vivid indigo accents, tonal surfaces and pill-shaped controls."
colors:
  background: "#F9FAFB"
  surface: "#F9FAFB"
  on-surface: "#4B5563"
  on-background: "#4B5563"
  on-surface-strong: "#161E2E"
  on-surface-variant: "#6B7280"
  on-surface-muted: "#9FA6B2"
  surface-container-low: "#FFFFFF"
  surface-container: "#EEF1F6"
  outline: "#FACA15"
  outline-variant: "#E5E7EB"
  primary: "#5850EC"
  on-primary: "#FFFFFF"
  inverse-surface: "#252F3F"
  secondary: "#3182CE"
  tertiary: "#0E9F6E"
typography:
  headline-display:
    fontFamily: system-ui
    fontSize: 48px
    fontWeight: 800
    lineHeight: 1
    letterSpacing: -0.025em
  headline-lg:
    fontFamily: system-ui
    fontSize: 36px
    fontWeight: 800
    lineHeight: 1.5
  headline-md:
    fontFamily: system-ui
    fontSize: 24px
    fontWeight: 600
    lineHeight: 1.5
  body-md:
    fontFamily: system-ui
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
  body-lg:
    fontFamily: system-ui
    fontSize: 18px
    fontWeight: 400
    lineHeight: 1.78
  body-sm:
    fontFamily: system-ui
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.5
  label-md:
    fontFamily: system-ui
    fontSize: 16px
    fontWeight: 500
    lineHeight: 1.5
  label-sm:
    fontFamily: system-ui
    fontSize: 14px
    fontWeight: 600
    lineHeight: 1.43
  headline-display-mobile:
    fontFamily: system-ui
    fontSize: 30px
    fontWeight: 800
    lineHeight: 1.2
rounded:
  sm: 3px
  md: 6px
  lg: 8px
  full: 9999px
spacing:
  base: 4px
  xs: 4px
  sm: 8px
  md: 16px
  lg: 32px
  xl: 40px
  gutter: 12px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-primary}"
    typography: "{typography.label-md}"
    rounded: "{rounded.md}"
    padding: 8px 20px
    height: 42px
  button-primary-hover:
    backgroundColor: "#6875F5"
  button-outline:
    backgroundColor: "{colors.surface-container-low}"
    textColor: "{colors.primary}"
    typography: "{typography.body-lg}"
    rounded: "{rounded.md}"
    padding: 16px 40px
    height: 58px
  button-outline-hover:
    textColor: "#6875F5"
  input-field:
    backgroundColor: "{colors.surface-container}"
    textColor: "{colors.inverse-surface}"
    typography: "{typography.body-md}"
    rounded: "{rounded.sm}"
    padding: 0px
  link:
    textColor: "#D2D6DC"
---

# Plausible Design System

## Overview

Plausible describes itself as: “Plausible is a lightweight and open-source Google Analytics alternative. Your website data is 100% yours and the privacy of your visitors is respected.” The interface is light, built on **Snow (#F9FAFB)** with **Dark Blue (#4B5563)** text, and **Vivid Indigo (#5850EC)** as the main accent.

Type is set in **system-ui**. Headlines run large with tight negative tracking; body text is 16px. Depth comes from soft drop shadows. Controls are pill-shaped.

Measured from [plausible.io](https://plausible.io/) on November 4, 2026 at 1440×900 and 390×844 from 321 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 14 roles.

- **Snow (#F9FAFB):** Page background, seen 1 time. Token `background`.
- **Dark Blue (#4B5563):** Primary text and headings, seen 41 times. Token `on-surface`.
- **Deep Blue (#161E2E):** Headings and emphasis, seen 13 times. Token `on-surface-strong`.
- **Cool Slate (#6B7280):** Secondary text, seen 16 times. Token `on-surface-variant`.
- **Blue (#9FA6B2):** Muted text and metadata, seen 5 times. Token `on-surface-muted`.
- **White (#FFFFFF):** Raised areas one step from the page, seen 5 times. Token `surface-container-low`.
- **Cool Mist (#EEF1F6):** Cards and panels, seen 1 time. Token `surface-container`.
- **Vivid Amber (#FACA15):** Borders and dividers, seen 1 time. Token `outline`.
- **Cool Mist (#E5E7EB):** Secondary dividers, seen 1 time. Token `outline-variant`.
- **Vivid Indigo (#5850EC):** Primary buttons and calls to action, seen 45 times. Token `primary`.
- **White (#FFFFFF):** Text and icons on primary. Token `on-primary`.
- **Deep Blue (#252F3F):** High-contrast fills, seen 1 time. Token `inverse-surface`.
- **Blue (#3182CE):** Accent in text, fills and borders, seen 7 times. Token `secondary`.
- **Dark Teal (#0E9F6E):** Accent, seen 8 times. Token `tertiary`.

## Typography

**system-ui** carries the whole interface. Fallback stack: `system-ui, -apple-system, BlinkMacSystemFont, Segoe UI`.

- **headline-display:** system-ui 48px at weight 800, line height 1, tracking -0.025em (30px on mobile). Page title (h1).
- **headline-lg:** system-ui 36px at weight 800, line height 1.5. Section headings (h2).
- **headline-md:** system-ui 24px at weight 600, line height 1.5. Sub-section headings.
- **body-md:** system-ui 16px at weight 400, line height 1.5. Body text.
- **body-lg:** system-ui 18px at weight 400, line height 1.78. Lead paragraphs.
- **body-sm:** system-ui 14px at weight 400, line height 1.5. Secondary and small text.
- **label-md:** system-ui 16px at weight 500, line height 1.5. Buttons, navigation and labels.
- **label-sm:** system-ui 14px at weight 600, line height 1.43. Small labels and badges.

## Layout

Spacing follows a 4px grid: 95% of measured gaps and paddings are multiples of 4px.

- **Scale:** xs 4px, sm 8px, md 16px, lg 32px, xl 40px.
- **Gaps:** 12px is the most common gap in flex and grid layouts.
- **Breakpoints:** 640px, 768px, 1024px, 1280px.

## Elevation & Depth

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

- `rgba(0, 0, 0, 0.1) 0px 1px 3px 0px, rgba(0, 0, 0, 0.06) 0px 1px 2px 0px`

## Shapes

Interactive controls are pill-shaped. Measured radii, most used first:

- **md (6px):** 36 elements.
- **full (9999px):** 16 elements.
- **sm (3px):** 4 elements.
- **lg (8px):** 4 elements.

## Components

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

- **button-primary (“Start free trial”):** #5850EC fill, #FFFFFF text, 16px/500, 6px radius, padding 8px 20px.
- **button-primary-hover:** background #6875F5, text #FFFFFF on hover.
- **button-outline (“View live demo”):** #FFFFFF fill, #5850EC text, 18px/500, 6px radius, padding 16px 40px.
- **button-outline-hover:** background #FFFFFF, text #6875F5 on hover.
- **input-field:** #EEF1F6 fill, #252F3F text, 16px/400, 3px radius, padding 0px, shadow `rgba(0, 0, 0, 0.1) 0px 1px 3px 0px, rgba(0, 0, 0, 0.06) 0px 1px 2px 0px`.
- **link:** transparent fill, #D2D6DC text, padding 0px.

## Do's and Don'ts

- Do use #F9FAFB for the page and lift surfaces in small steps: #FFFFFF, #EEF1F6.
- Do keep text in 4 levels: #4B5563, #161E2E, #6B7280, #9FA6B2.
- Do reserve #5850EC for primary actions and key highlights.
- Do set headlines in system-ui with tight tracking (-0.025em).
- Do keep spacing on the 4px grid.
- Do make buttons and chips fully rounded (9999px); most other elements use 6px corners.
- Don't use #9FA6B2 for body text; it reaches 2.34:1 on #F9FAFB. Keep it for large text or metadata.
- Don't introduce new font families beyond system-ui.
- Don't use #5850EC for large backgrounds or body text.
- Don't make interface transitions slower than 0.2s.

## Motion

Interface transitions are quick: 0.15s, 0.2s.

- **Easing:** `cubic-bezier(0.4, 0, 0.2, 1)`.

Generated by [Sitepeel](https://sitepeel.dev/design-md/plausible.io/), the free DESIGN.md generator (engine 2026.10.29+b828a475ee10).

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