Sendgrid vs SmtpJS
Head-to-head usage across the sites we track.
Top sites by authority
Sendgrid · SmtpJS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
45
4
Open Page Rank 8+
717
6
Open Page Rank 7+
3,361
7
Open Page Rank 6+
7,038
7
Open Page Rank 5+
12,779
9
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Sendgrid · SmtpJS · share of sites in each country using one or the other
United States
78,320
81
Brazil
30,202
65
United Kingdom
27,462
43
Germany
24,487
42
Canada
22,678
39
India
22,129
263
Australia
17,834
29
France
17,072
43
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Sendgrid | SmtpJS |
|---|---|---|
| LCP | 1.8 s | 2.4 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 850 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.