Duolingo — Design Score: 80/100 (grade B)
Strong type & color foundation (93/83), but primary CTA is unreadable (2.44:1 contrast) and spacing grid adherence is loose (64%)—fixes here unlock usability.
This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/score/duolingo.com.
The four measured dimensions
- Typography & Hierarchy: 93/100
- Color & Contrast: 83/100
- Spacing & Layout: 66/100
- Motion & Polish: 68/100
What we measured
- Typography & Hierarchy — type ladder rhythm: 1.33× · 1.50× · 1.88× · 1.13× (33.2/35)
- Typography & Hierarchy — weight contrast: [400, 500, 600, 700] (spread 300) (20.0/20)
- Typography & Hierarchy — body line-height: 1.41 (15.0/15)
- Typography & Hierarchy — size discipline: 5 (20.0/20)
- Color & Contrast — body text contrast (WCAG): 11.03:1 (30.0/30)
- Color & Contrast — primary button contrast: 2.44:1 (2.9/10)
- Color & Contrast — accent discipline: 3 (20.0/20)
- Color & Contrast — surface coverage: 89% dominant (20.0/20)
- Color & Contrast — scheme consistency: light (10.0/20)
- Spacing & Layout — spacing grid: 4px grid · 65% confidence (22.8/35)
- Spacing & Layout — grid adherence: 7/11 on 4px (15.9/25)
- Spacing & Layout — structure & responsive: 2 breakpoints (15.0/15)
- Motion & Polish — motion tokens: 200ms dominant (25.0/25)
- Motion & Polish — choreography: 3 reveal candidates (10.0/20)
Every line above is read from the live DOM — the exact contrast ratio, the detected spacing grid, the forced hover states — not an AI's guess from a screenshot.
Top fixes
- Raise primary CTA button contrast to 4.5:1 minimum
- Enforce 4px grid adherence across all spacings to 80%+
- Add measured interactive states (hover/focus) to CTA
The comprehensive report — every fix with why + the exact how-to — is part of Mozaika Pro.
An automated measurement of Duolingo's publicly-visible design (color, type, spacing, motion) — not affiliated with duolingo.com. Removal requests: hello@mozaika.design.