Apple iCloud Mail vs Zimbra
Head-to-head usage across the sites we track.
Top sites by authority
Apple iCloud Mail · Zimbra · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
129
0
Open Page Rank 8+
2,153
38
Open Page Rank 7+
9,391
156
Open Page Rank 6+
18,109
274
Open Page Rank 5+
30,668
420
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Apple iCloud Mail · Zimbra · share of sites in each country using one or the other
United States
122,210
840
United Kingdom
43,864
356
Germany
41,637
440
India
39,000
718
Canada
33,110
270
France
24,224
514
Australia
24,281
166
Netherlands
20,791
321
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Apple iCloud Mail | Zimbra |
|---|---|---|
| LCP | 1.7 s | 1.7 s |
| INP | 75 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 600 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.