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+
718
6
Open Page Rank 7+
3,368
7
Open Page Rank 6+
7,019
7
Open Page Rank 5+
12,796
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
86,052
99
Brazil
32,654
67
United Kingdom
31,228
47
Germany
27,028
51
Canada
25,606
44
India
24,793
313
France
20,521
48
Australia
19,815
39
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Sendgrid | SmtpJS |
|---|---|---|
| LCP | 1.8 s | 2.5 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.