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+
191
1
Open Page Rank 8+
4,159
4
Open Page Rank 7+
21,919
8
Open Page Rank 6+
48,899
10
Open Page Rank 5+
95,932
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
1,316,642
120
India
553,211
57
Brazil
440,793
52
Japan
425,221
21
United Kingdom
406,311
68
France
369,694
38
Italy
324,473
48
Spain
306,909
55
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, 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.