Substack vs Tumblr
Head-to-head usage across the sites we track.
Top sites by authority
Substack · Tumblr · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
2
2
Open Page Rank 8+
13
13
Open Page Rank 7+
58
26
Open Page Rank 6+
134
35
Open Page Rank 5+
226
44
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Substack · Tumblr · share of sites in each country using one or the other
United States
2,503
510
United Kingdom
769
252
India
731
225
Canada
614
229
Australia
333
165
Germany
300
196
Brazil
284
188
Spain
294
176
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Substack | Tumblr |
|---|---|---|
| LCP | 1.6 s | 1.7 s |
| INP | 100 ms | 50 ms |
| CLS | 0 | 0 |
| TTFB | 500 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.