Bootstrap vs Preline UI
Head-to-head usage across the sites we track.
Top sites by authority
Bootstrap · Preline UI · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
184
1
Open Page Rank 8+
3,816
5
Open Page Rank 7+
18,496
8
Open Page Rank 6+
38,723
11
Open Page Rank 5+
71,693
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 · Preline UI · share of sites in each country using one or the other
United States
758,929
131
India
368,409
181
Germany
277,428
53
United Kingdom
255,833
66
Brazil
241,343
50
France
234,434
49
Italy
222,549
37
Spain
183,194
31
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Bootstrap | Preline UI |
|---|---|---|
| LCP | 1.8 s | 2 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Bootstrap to Preline UI
| Domain | When |
|---|---|
| instacertify.com | Dec 2025 |
Preline UI to Bootstrap
| Domain | When |
|---|---|
| roomerstays.com | May 2026 |
| sos-jordan.org | Mar 2026 |
| makotamu.org | Dec 2025 |