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+
180
0
Open Page Rank 8+
3,860
10
Open Page Rank 7+
18,993
17
Open Page Rank 6+
40,203
24
Open Page Rank 5+
74,817
27
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
886,770
73
India
429,293
54
Germany
322,762
59
United Kingdom
295,976
47
France
279,130
43
Brazil
273,285
30
Italy
251,088
47
Spain
202,979
40
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Bootstrap | Clarity |
|---|---|---|
| LCP | 1.8 s | 2.1 s |
| INP | 75 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 500 ms |
Median site's p75 values from the Chrome UX Report, Jun 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.