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+
3,817
10
Open Page Rank 7+
18,570
17
Open Page Rank 6+
39,005
23
Open Page Rank 5+
72,373
26
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
758,929
59
India
368,409
53
Germany
277,428
52
United Kingdom
255,833
45
Brazil
241,343
27
France
234,434
40
Italy
222,549
41
Spain
183,194
37
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, 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.