Google Font API vs sIFR
Head-to-head usage across the sites we track.
Top sites by authority
Google Font API · sIFR · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
194
1
Open Page Rank 8+
4,170
5
Open Page Rank 7+
22,090
10
Open Page Rank 6+
49,367
11
Open Page Rank 5+
96,990
14
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Google Font API · sIFR · share of sites in each country using one or the other
United States
1,502,923
143
India
616,138
64
Japan
483,655
28
United Kingdom
467,747
78
Brazil
443,460
51
France
437,883
49
Italy
373,040
54
Spain
351,619
62
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Font API | sIFR |
|---|---|---|
| LCP | 2 s | 1.6 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 700 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.