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+
3
30
Open Page Rank 7+
18
92
Open Page Rank 6+
30
176
Open Page Rank 5+
47
288
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
2,864
328
United States
1,101
1,236
Canada
223
798
India
146
748
United Kingdom
140
743
Australia
95
550
Germany
66
476
Mexico
76
461
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | CartStack | UpSellit |
|---|---|---|
| LCP | 2 s | 2 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 700 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.