Clerk.io vs Kiwi Sizing
Head-to-head usage across the sites we track.
Top sites by authority
Clerk.io · Kiwi Sizing · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
2
4
Open Page Rank 8+
2
6
Open Page Rank 7+
8
14
Open Page Rank 6+
13
24
Open Page Rank 5+
30
40
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 · Kiwi Sizing · share of sites in each country using one or the other
United States
296
2,456
United Kingdom
419
1,161
India
148
1,134
Germany
474
735
Italy
575
547
France
335
712
Canada
110
927
Australia
88
765
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Clerk.io | Kiwi Sizing |
|---|---|---|
| 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.