Duolingo — design system & UI screens

Consumer · 1 screen · 12 sections · duolingo.com

Centered hero pairs a clustered cast of chunky 3D Duolingo characters with the "free, fun, and effective way to learn a language!" headline and a green pill "GET STARTED" CTA above a blue outlined sign-in button. The signature device is the alternating left/right rhythm of oversized 3D character vignettes against pure white, each titled in Duolingo's heavy rounded display type in alternating green/navy, punctuated by a deep-indigo "SUPER DUOLINGO" band and a flag-row language picker. A vivid grass-green bottom CTA panel with a jar-and-coins illustration leads into a dense multi-column green footer.

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.

Decoded design system

Duolingo's decoded design system: background #FFFFFF, text #777777, accent #100F3E, link #100F3E, primary #1CB0F6; type scale h1 32px / h2 48px / body 17px; 4px spacing base; 3px base radius. The single interactive/action color is #100F3E — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#FFFFFF`
surface	`#F6F6F6`
border	`#EAEAEA`
text	`#777777`
text_muted	`#AAAAAA`
primary	`#1CB0F6`
accent	`#100F3E`
link	`#100F3E`
secondary	`#0000EE`
button_bg	`#100F3E`
button_text	`#000437`

Using these colors

Action color #100F3E — the single interactive color; only on things you click or must notice, never large fills.
accent, link, button_bg are all #100F3E — one role, not several (the action color).
accent #100F3E — 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.
primary #1CB0F6 — a brand color — but the call-to-action uses #100F3E, not this.
secondary #0000EE — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.

Typography

Heading: Duolingo Sans
Body: Duolingo Sans
h1: 32px
h2: 48px
body: 17px

Spacing

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

Radii

base: 3px
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 400ms.

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 →

Screens

Duolingo consumer landing page with mascot-driven hero and alternating illustrated feature rows