Outlook Web App vs RainLoop
Head-to-head usage across the sites we track.
Top sites by authority
Outlook Web App · RainLoop · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 8+
11
0
Open Page Rank 7+
29
1
Open Page Rank 6+
50
2
Open Page Rank 5+
68
3
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Outlook Web App · RainLoop · share of sites in each country using one or the other
United States
3,011
35
India
1,731
39
United Kingdom
1,538
25
Germany
1,446
33
France
1,326
28
Canada
1,313
15
Spain
1,125
22
Netherlands
1,098
31
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Outlook Web App | RainLoop |
|---|---|---|
| LCP | 1.7 s | 1.5 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 500 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.