Kartra vs Sendinblue
Head-to-head usage across the sites we track.
Top sites by authority
Kartra · Sendinblue · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
14
Open Page Rank 8+
1
263
Open Page Rank 7+
2
1,127
Open Page Rank 6+
2
2,466
Open Page Rank 5+
8
4,672
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Kartra · Sendinblue · share of sites in each country using one or the other
France
30
30,954
United States
390
22,537
Germany
35
16,656
Italy
61
15,681
United Kingdom
103
13,949
Spain
22
11,748
India
65
11,543
Netherlands
22
9,324
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Kartra | Sendinblue |
|---|---|---|
| LCP | 2.3 s | 2 s |
| INP | 75 ms | 75 ms |
| CLS | 0.05 | 0 |
| TTFB | 1000 ms | 900 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.