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
14
Open Page Rank 7+
54
29
Open Page Rank 6+
128
37
Open Page Rank 5+
221
46
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
2,486
505
United Kingdom
799
247
India
736
224
Canada
611
235
Australia
362
171
Germany
306
198
Brazil
290
192
Spain
282
168
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Substack | Tumblr |
|---|---|---|
| LCP | 1.6 s | 1.6 s |
| INP | 75 ms | 50 ms |
| CLS | 0 | 0 |
| TTFB | 500 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.