amazonappsThere are millions of mobile apps available to download, but it appears most smartphone owners aren’t taking the time to check them out.

The latest study from comScore found that 66 percent of U.S. smartphone users download zero apps per month. For the one-third that do download apps every month, the average among this group is about three apps per month. comScore also notes that seven percent of smartphone owners account for almost half of all download activity every month.

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As Quartz points out, one possible explanation for this is that many smartphone users download the apps they need when they buy their device, and then rarely add new apps as time goes on.

Other interesting data points:

  • The average smartphone user spends seven out of every eight minutes on his or her smartphone using apps.
  • Mobile app usage has taken over the majority of digital media time spent at 52 percent.
  • 57 percent of users access apps every day, while 26 percent of tablet owners do the same.
  • 42 percent of all app time spent on smartphones happens on a user’s single-most used app.
  • The median iPhone app user earns $85,000 per year; the median Android app user earns $61,000 per year. iPhone users also spend an average of nine more hours with apps compared to Android owners.

Here’s how different age groups compare for share of mobile app time spent:

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See the full study here.

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