Bootstrap vs Clarity
Head-to-head usage across the sites we track.
Top sites by authority
Bootstrap · Clarity · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
181
0
Open Page Rank 8+
3,822
10
Open Page Rank 7+
18,772
16
Open Page Rank 6+
39,549
22
Open Page Rank 5+
73,510
25
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Bootstrap · Clarity · share of sites in each country using one or the other
United States
783,149
59
India
375,468
50
Germany
285,193
50
United Kingdom
258,945
41
Brazil
247,896
28
France
233,698
37
Italy
215,264
37
Canada
174,973
29
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Bootstrap | Clarity |
|---|---|---|
| LCP | 1.8 s | 2.2 s |
| INP | 75 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 500 ms |
Median site's p75 values from the Chrome UX Report, Aug 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.