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+
13
0
Open Page Rank 7+
32
2
Open Page Rank 6+
49
2
Open Page Rank 5+
67
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
2,704
26
India
1,547
34
United Kingdom
1,345
19
Germany
1,268
29
Canada
1,153
11
France
1,078
18
Spain
973
21
Netherlands
923
22
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, 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.