Duolingo Mobile — design system & UI screens

Consumer · 9 screens · duolingo.com

This is an online learning platform offering language and subject courses. The screen displays a vertically scrolling list of available courses—Spanish, French, German, Italian, Japanese, Chinese, Korean, Intermediate English, Math, and Music—each with a country or subject flag icon and course title. Each row is a simple list item with consistent spacing, light horizontal dividers, and small action icons on the right edge suggesting navigation or options.

Open in Mozaika →

This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/website/duolingo-mobile.

Decoded design system

Duolingo Mobile's decoded design system: background #FFFFFF, text #713500, accent #58CC02, link #58CC02, primary #58CC02; type scale h1 34px / h2 22px / body 17px; 4px spacing base; 12px base radius. The single interactive/action color is #58CC02 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#FFFFFF`
surface	`#F6F2EF`
border	`#E9E0D8`
text	`#713500`
text_muted	`#A68160`
primary	`#58CC02`
accent	`#58CC02`
link	`#58CC02`
button_bg	`#58CC02`
button_text	`#FFFFFF`

Using these colors

Action color #58CC02 — the single interactive color; only on things you click or must notice, never large fills.
primary, accent, link, button_bg are all #58CC02 — one role, not several (the action color).
accent #58CC02 — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.

Typography

h1: 34px
h2: 22px
body: 17px

Spacing

base unit: 4px
scale: 12px, 16px, 23px, 24px, 30px, 40px, 48px, 70px, 80px, 96px

Radii

base: 12px
button: 12px

Motion

Micro-interactions run at 200ms (dominant) with ease.

durations: 200ms · 300ms · 400ms
easings: ease · cubic-bezier(0.22, 1, 0.36, 1)
animated properties: transform, border-color, filter

Native design tokens

Token	Value
`--web-ui_button-border-radius`	`16px`
`--text-heading-weight-medium`	`700`
`--text-label-weight-large`	`700`
`--text-heading-weight-xsmall`	`700`
`--text-heading-weight-small`	`700`
`--text-body-weight-bold`	`700`
`--text-caption-weight-bold`	`700`
`--text-body-weight-spacious-bold`	`700`
`--text-body-weight-spacious`	`500`
`--text-label-weight-medium`	`700`

…and 29 more measured on the page.

Layout (measured)

container max-width: 990px
nav: 900px
common grid: 2 columns

Motion choreography (measured)

Scroll reveal: 3 elements rest at opacity 0, animate in over 300ms.

Responsive (measured)

breakpoints: 530px · 550px · 699px · 768px · 896px · 1065px
mobile (390px): hero 32px · nav hamburger

Full design system, per-section tokens & DESIGN.md / Tailwind / CSS exports →