Express vs ZK
Head-to-head usage across the sites we track.
Top sites by authority
Express · ZK · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
70
0
Open Page Rank 8+
813
8
Open Page Rank 7+
2,340
24
Open Page Rank 6+
3,777
42
Open Page Rank 5+
5,713
62
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Express · ZK · share of sites in each country using one or the other
United States
38,574
159
India
23,764
73
United Kingdom
16,896
81
Brazil
15,921
95
Germany
15,170
90
Canada
14,018
70
France
13,689
71
Spain
12,088
81
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Express | ZK |
|---|---|---|
| LCP | 2.2 s | 1.9 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 650 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.