# OpenRouter design system

> OpenRouter design system measured from openrouter.ai: gordita font, #7624F4 primary on #FCFCFE, 9 color hex codes, type scale, spacing and a free DESIGN.md.

Canonical page: https://sitepeel.dev/design-md/openrouter.ai/

OpenRouter’s website (openrouter.ai) uses the gordita font and #7624F4 as its main color on a #FCFCFE background. Measured by Sitepeel on November 4, 2026.

## What font does OpenRouter use?

OpenRouter uses gordita (weight 700) and Plus Jakarta Sans (weights 450, 500, 600 and 700) on openrouter.ai. Page titles are 56px at weight 700 and body text is 14px. Measured on November 4, 2026.

- gordita (weights 700)
- Plus Jakarta Sans (weights 450, 500, 600, 700)

## OpenRouter colors: palette and hex codes

OpenRouter’s main colors are #FCFCFE (snow) for the background, #03080A (near black) for text and #7624F4 (vivid violet) as the main accent, with #E27625 (orange) as another accent. Measured on November 4, 2026.

- #FCFCFE: snow
- #03080A: near black
- #505456: cool slate
- #FFFFFF: white
- #7624F4: vivid violet
- #E27625: orange

## What is OpenRouter built with?

OpenRouter’s website (openrouter.ai) is built with Next.js, React, Radix UI, Tailwind CSS and Cloudflare. Measured on November 4, 2026.

- JavaScript framework: Next.js 16.4.5, React 18.3.1
- Analytics: PostHog, Cloudflare Web Analytics, Datadog RUM, Google Analytics
- Hosting & CDN: Cloudflare, Vercel
- Payments & commerce: Stripe
- UI & CSS: Radix UI, Tailwind CSS 4.x
- Fonts & icons: Lucide

## Questions and answers

### What font does OpenRouter use?

OpenRouter’s website uses gordita (weight 700) and Plus Jakarta Sans (weights 450, 500, 600 and 700). Page titles are 56px at weight 700 and body text is 14px. Measured on November 4, 2026.

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

On openrouter.ai: #FCFCFE (snow) for the background, #03080A (near black) for text and #7624F4 (vivid violet) as the main accent, with #E27625 (orange) as another accent. The color palette above lists all 9 colors with their hex codes and where each one is used.

### What is the OpenRouter design system?

The design system on this page is openrouter.ai’s, as measured on November 4, 2026: gordita type, #7624F4 as the main color and 6px corners, written down as a DESIGN.md. It is not OpenRouter’s own documentation.

### What is OpenRouter built with?

OpenRouter’s website (openrouter.ai) is built with Next.js, React, Radix UI, Tailwind CSS and Cloudflare. The full tech stack Sitepeel found: Next.js, React, PostHog, Cloudflare, Vercel, Cloudflare Web Analytics, Stripe, Radix UI, Tailwind CSS and Lucide. Measured on November 4, 2026.

### What is the OpenRouter DESIGN.md?

A plain-text file with OpenRouter’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 OpenRouter’s official design system?

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

### Can I use OpenRouter’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 OpenRouter’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/openrouter.ai/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 OpenRouter.

## The DESIGN.md file

```markdown
---
version: alpha
name: OpenRouter
description: "Light interface measured from openrouter.ai: gordita type with Plus Jakarta Sans, vivid violet accents, tonal surfaces and 6px corners."
colors:
  background: "#FCFCFE"
  surface: "#FCFCFE"
  on-surface: "#03080A"
  on-background: "#03080A"
  on-surface-variant: "#505456"
  surface-container-low: "#FFFFFF"
  outline: "#03080A14"
  primary: "#7624F4"
  on-primary: "#FCFCFE"
  secondary: "#E27625"
  success: "#007544"
typography:
  headline-display:
    fontFamily: gordita
    fontSize: 56px
    fontWeight: 700
    lineHeight: 1.2
    letterSpacing: -0.025em
  headline-lg:
    fontFamily: Plus Jakarta Sans
    fontSize: 36px
    fontWeight: 700
    lineHeight: 1.2
  headline-md:
    fontFamily: Plus Jakarta Sans
    fontSize: 20px
    fontWeight: 600
    lineHeight: 1.2
  body-md:
    fontFamily: Plus Jakarta Sans
    fontSize: 14px
    fontWeight: 450
    lineHeight: 1.63
  body-lg:
    fontFamily: Plus Jakarta Sans
    fontSize: 16px
    fontWeight: 450
    lineHeight: 1.35
  body-sm:
    fontFamily: Plus Jakarta Sans
    fontSize: 12px
    fontWeight: 450
    lineHeight: 1.35
  label-lg:
    fontFamily: Plus Jakarta Sans
    fontSize: 16px
    fontWeight: 500
    lineHeight: 1.35
  label-md:
    fontFamily: Plus Jakarta Sans
    fontSize: 14px
    fontWeight: 500
    lineHeight: 1.63
  label-sm:
    fontFamily: Plus Jakarta Sans
    fontSize: 12px
    fontWeight: 500
    lineHeight: 1.63
rounded:
  sm: 4px
  md: 6px
  lg: 8px
spacing:
  xs: 4px
  sm: 8px
  md: 12px
  lg: 24px
  xl: 48px
  gutter: 8px
  section: 56px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-primary}"
    typography: "{typography.label-md}"
    rounded: "{rounded.md}"
    padding: 0px 12px
    height: 32px
  button-outline:
    backgroundColor: "{colors.surface-container-low}"
    textColor: "#03080A7B"
    typography: "{typography.body-md}"
    rounded: "{rounded.md}"
    padding: 0px 12px
    height: 32px
  button-ghost:
    textColor: "{colors.on-surface-variant}"
    typography: "{typography.label-md}"
    rounded: "{rounded.md}"
    padding: 0px 8px
  input-field:
    backgroundColor: "{colors.surface-container-low}"
    textColor: "{colors.on-surface}"
    typography: "{typography.body-md}"
    rounded: "{rounded.md}"
    padding: 8px 12px
  card:
    backgroundColor: "{colors.surface-container-low}"
    textColor: "{colors.on-surface}"
    typography: "{typography.body-md}"
    rounded: "{rounded.lg}"
    padding: 0px
  link:
    textColor: "{colors.on-surface-variant}"
---

# OpenRouter Design System

## Overview

OpenRouter describes itself as: “The unified interface for every model. Find the best models & prices for your prompts” The interface is light, built on **Snow (#FCFCFE)** with **Near Black (#03080A)** text, and **Vivid Violet (#7624F4)** as the main accent.

Type is set in **gordita** and **Plus Jakarta Sans**. Headlines run large with tight negative tracking; body text is 14px. Depth comes from soft drop shadows. Corners are mostly 6px.

Measured from [openrouter.ai](https://openrouter.ai/) on November 4, 2026 at 1440×900 and 390×844 from 294 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 9 roles.

- **Snow (#FCFCFE):** Page background, seen 12 times. Token `background`.
- **Near Black (#03080A):** Primary text and headings, seen 36 times. Token `on-surface`.
- **Cool Slate (#505456):** Secondary text, seen 78 times. Token `on-surface-variant`.
- **White (#FFFFFF):** Raised areas one step from the page, seen 13 times. Token `surface-container-low`.
- **Near Black 8% (#03080A14):** Borders and dividers, seen 19 times. Token `outline`.
- **Vivid Violet (#7624F4):** Primary buttons and calls to action, seen 6 times. Token `primary`, CSS `--violet-9`.
- **Snow (#FCFCFE):** Text and icons on primary. Token `on-primary`.
- **Orange (#E27625):** Accent, seen 2 times. Token `secondary`, CSS `--color-logo-metamask-orange-muted`.
- **Dark Teal (#007544):** Success and positive states, seen 2 times. Token `success`.

## Typography

**gordita** and **Plus Jakarta Sans** share the interface. Fallback stack: `gordita, gordita Fallback, Plus Jakarta Sans, jakarta`. Other loaded fonts: geistMono.

- **headline-display:** gordita 56px at weight 700, line height 1.2, tracking -0.025em. Page title (h1).
- **headline-lg:** Plus Jakarta Sans 36px at weight 700, line height 1.2. Section headings (h2).
- **headline-md:** Plus Jakarta Sans 20px at weight 600, line height 1.2. Sub-section headings.
- **body-md:** Plus Jakarta Sans 14px at weight 450, line height 1.63. Body text.
- **body-lg:** Plus Jakarta Sans 16px at weight 450, line height 1.35. Lead paragraphs.
- **body-sm:** Plus Jakarta Sans 12px at weight 450, line height 1.35. Secondary and small text.
- **label-lg:** Plus Jakarta Sans 16px at weight 500, line height 1.35. Large buttons and tabs.
- **label-md:** Plus Jakarta Sans 14px at weight 500, line height 1.63. Buttons, navigation and labels.
- **label-sm:** Plus Jakarta Sans 12px at weight 500, line height 1.63. Small labels and badges.

## Layout

Spacing is mostly on a 4px grid (83% of measured values), with some off-grid steps. Match the measured scale rather than rounding everything.

- **Scale:** xs 4px, sm 8px, md 12px, lg 24px, xl 48px.
- **Sections:** 56px vertical padding between major sections.
- **Gaps:** 8px is the most common gap in flex and grid layouts.
- **Breakpoints:** 375px, 480px, 668px.

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

## Shapes

Most elements use 6px corners. Measured radii, most used first:

- **md (6px):** 64 elements.
- **lg (8px):** 54 elements.
- **sm (4px):** 16 elements.

## Components

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

- **button-primary (“Sign Up”):** #7624F4 fill, #FCFCFE text, 14px/500, 6px radius, padding 0px 12px.
- **button-outline (“Search ⌘ K”):** #FFFFFF fill, #03080A7B text, 14px/450, 6px radius, padding 0px 12px, border 1px solid #03080A14.
- **button-ghost (“Models”):** transparent fill, #03080AB0 text, 14px/500, 6px radius, padding 0px 8px.
- **input-field (“you@company.com”):** #FFFFFF fill, #03080A text, 14px/450, 6px radius, padding 8px 12px, border 1px solid #03080A14.
- **card:** #FFFFFF fill, #03080A text, 14px/450, 8px radius, padding 0px, border 1px solid #03080A14.
- **link:** transparent fill, #03080AB0 text, padding 0px.

## Do's and Don'ts

- Do use #FCFCFE for the page and lift surfaces in small steps: #FFFFFF.
- Do keep text in 2 levels: #03080A, #505456.
- Do reserve #7624F4 for primary actions and key highlights.
- Do set headlines in gordita with tight tracking (-0.025em).
- Do reuse the measured spacing steps (8px, 12px, 24px).
- Do use 6px corners on most elements; larger surfaces also use 8px and 4px.
- Don't introduce new font families beyond gordita and Plus Jakarta Sans.
- Don't use #7624F4 for large backgrounds or body text.
- Don't make interface transitions slower than 0.25s.

## Motion

Interface transitions are quick: 0.15s, 0.1s, 0.25s.

- **Easing:** `cubic-bezier(0.4, 0, 0.2, 1)`, `ease`, `cubic-bezier(0.77, 0, 0.175, 1)`.
- **Reduced motion:** the page responds to `prefers-reduced-motion`.

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

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