Customer.io vs OneSignal
Head-to-head usage across the sites we track.
Top sites by authority
Customer.io · OneSignal · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
11
Open Page Rank 8+
18
167
Open Page Rank 7+
68
706
Open Page Rank 6+
117
1,392
Open Page Rank 5+
181
2,349
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Customer.io · OneSignal · share of sites in each country using one or the other
India
564
12,179
United States
868
10,769
Brazil
318
8,551
Germany
405
6,588
United Kingdom
489
6,487
France
370
5,745
Spain
346
5,712
Italy
312
5,589
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Customer.io | OneSignal |
|---|---|---|
| LCP | 2.4 s | 2.5 s |
| INP | 125 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 1100 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.