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+
190
1
Open Page Rank 8+
4,159
4
Open Page Rank 7+
21,677
8
Open Page Rank 6+
47,996
8
Open Page Rank 5+
93,642
12
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
1,258,056
123
India
547,297
57
Brazil
434,650
53
Japan
421,467
19
United Kingdom
401,120
70
France
371,258
41
Italy
336,191
49
Spain
324,038
54
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Font API | sIFR |
|---|---|---|
| LCP | 2 s | 1.5 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 700 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.