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
4
Open Page Rank 8+
3
28
Open Page Rank 7+
18
90
Open Page Rank 6+
28
178
Open Page Rank 5+
48
293
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
3,313
365
United States
1,254
1,401
Canada
253
920
India
163
860
United Kingdom
168
841
Australia
115
645
France
73
598
Germany
71
587
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 | 0.05 | 0 |
| TTFB | 1000 ms | 700 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.