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+
8
33
Open Page Rank 6+
13
99
Open Page Rank 5+
30
293
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
296
7,503
Canada
110
3,239
United Kingdom
419
2,815
India
148
2,134
Australia
88
1,972
Germany
474
1,346
France
335
1,222
Italy
575
781
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Clerk.io | Rebuy |
|---|---|---|
| LCP | 1.7 s | 1.7 s |
| INP | 100 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.