Mailjet vs SmtpJS
Head-to-head usage across the sites we track.
Top sites by authority
Mailjet · SmtpJS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
9
4
Open Page Rank 8+
254
6
Open Page Rank 7+
1,372
7
Open Page Rank 6+
3,269
7
Open Page Rank 5+
6,319
9
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Mailjet · SmtpJS · share of sites in each country using one or the other
France
34,034
43
Germany
16,309
42
United States
14,939
81
United Kingdom
10,701
43
Spain
10,168
39
Belgium
9,890
18
Netherlands
9,332
27
Italy
8,523
34
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Mailjet | SmtpJS |
|---|---|---|
| LCP | 1.8 s | 2.4 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 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.