Express vs Flask
Head-to-head usage across the sites we track.
Top sites by authority
Express · Flask · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
63
3
Open Page Rank 8+
794
16
Open Page Rank 7+
2,329
37
Open Page Rank 6+
3,763
55
Open Page Rank 5+
5,743
77
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Express · Flask · share of sites in each country using one or the other
United States
41,639
322
India
25,247
260
United Kingdom
18,417
151
Germany
17,171
225
Brazil
16,922
183
France
15,941
334
Canada
15,658
142
Spain
13,005
318
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Express | Flask |
|---|---|---|
| LCP | 2.3 s | 1.8 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 800 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.