Flat UI vs ZURB Foundation
Head-to-head usage across the sites we track.
Top sites by authority
Flat UI · ZURB Foundation · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
65
Open Page Rank 8+
13
980
Open Page Rank 7+
25
3,281
Open Page Rank 6+
35
5,942
Open Page Rank 5+
50
9,943
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Flat UI · ZURB Foundation · share of sites in each country using one or the other
United States
311
86,282
United Kingdom
219
29,226
Germany
145
23,949
Canada
133
23,311
India
205
21,706
France
120
19,589
Netherlands
105
16,523
Italy
131
15,964
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Flat UI | ZURB Foundation |
|---|---|---|
| LCP | 2 s | 1.8 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 900 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.