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+
126
0
Open Page Rank 8+
2,135
38
Open Page Rank 7+
9,283
162
Open Page Rank 6+
17,844
284
Open Page Rank 5+
30,151
436
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
129,767
960
United Kingdom
50,050
405
Germany
46,068
533
India
42,601
790
Canada
36,709
305
France
29,018
591
Australia
26,471
184
Netherlands
23,412
430
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, 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.