Clerk.io vs Rebuy
Head-to-head usage across the sites we track.
Top sites by authority
Clerk.io · Rebuy · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
2
1
Open Page Rank 8+
2
7
Open Page Rank 7+
7
33
Open Page Rank 6+
12
100
Open Page Rank 5+
32
299
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Clerk.io · Rebuy · share of sites in each country using one or the other
United States
266
6,808
Canada
103
2,956
United Kingdom
418
2,577
India
121
1,980
Australia
79
1,774
Germany
453
1,263
France
304
1,094
Italy
518
806
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Clerk.io | Rebuy |
|---|---|---|
| LCP | 1.7 s | 1.6 s |
| INP | 100 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.