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+
68
3
Open Page Rank 8+
811
13
Open Page Rank 7+
2,333
39
Open Page Rank 6+
3,764
52
Open Page Rank 5+
5,709
69
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
38,574
275
India
23,764
251
United Kingdom
16,896
137
Brazil
15,921
168
Germany
15,170
206
Canada
14,018
116
France
13,689
301
Spain
12,088
278
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Express | Flask |
|---|---|---|
| LCP | 2.2 s | 1.8 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Express to Flask
| Domain | When |
|---|---|
| https.ng | May 2026 |