CartStack vs UpSellit
Head-to-head usage across the sites we track.
Top sites by authority
CartStack · UpSellit · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
3
Open Page Rank 8+
4
31
Open Page Rank 7+
19
93
Open Page Rank 6+
30
174
Open Page Rank 5+
51
296
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
CartStack · UpSellit · share of sites in each country using one or the other
Brazil
2,932
326
United States
1,129
1,247
Canada
236
816
India
149
755
United Kingdom
141
740
Australia
100
566
Germany
69
495
Mexico
81
454
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | CartStack | UpSellit |
|---|---|---|
| LCP | 2 s | 2.1 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0 |
| TTFB | 1000 ms | 700 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.