The current average USERindex scores are based on results from 142 studies and 3531 participants across internet sites and mobile apps, collected from 2014 through 2016.

The current (2016) average USERindex is 4.12. The 2015 average was 4.07.

Some other averages:

  Overall USERindex Usefulness Satisfaction Ease of Use Reliability
All devices and categories 4.12 4.12 4.04 4.15 4.16
Retail (all devices) 4.26 4.24 4.14 4.37 4.27
Desktop (all categories) 4.25 4.11 4.14 4.04 4.15
Responsive sites (across devices) 4.09 4.08 3.93 4.20 4.12