Klaviyo vs Systeme.io
Head-to-head usage across the sites we track.
Top sites by authority
Klaviyo · Systeme.io · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
20
3
Open Page Rank 8+
117
4
Open Page Rank 7+
471
4
Open Page Rank 6+
1,263
4
Open Page Rank 5+
3,084
4
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Klaviyo · Systeme.io · share of sites in each country using one or the other
United States
94,628
75
United Kingdom
37,132
17
Canada
29,501
22
Australia
27,110
14
Germany
23,957
17
France
20,942
118
India
19,705
54
Spain
16,472
29
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Klaviyo | Systeme.io |
|---|---|---|
| LCP | 1.6 s | 2.3 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 900 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.