App store rankings, page-342

"Traditional watches fell to just 56% of the value of total U.S. watch sales last year, according to NPD. In the fourth quarter of 2018, smartwatches outsold traditional watches, accounting for 55% of total sales for the holiday period, according to Brack. "

That jump comes on top of a 51% increase in dollar sales of smartwatches for the full year in 2018 and a 61% increase in unit sales, according to NPD. NPD estimates the size of the U.S. smartwatch market for 2018 at nearly $5 billion. The January-through-June data reinforces the conclusion of an NPD report on smartwatches issued in February: smartwatches turned a corner in the U.S. last year and have gained acceptance by the mainstream American consumer.

"Over the past 18 months, smartwatch sales gained strong momentum," stated Weston Henderek, NPD's director/industry analyst for connected intelligence, in a February press release announcing the group's Smartwatch Total Market Report. "The ability to be truly connected via built-in LTE without the need to have a smartphone nearby proved to be a tipping point for consumers," Henderek said. "They now recognize the value in being able to complete a wide range of tasks on the device, including receiving notifications, messaging, accessing smart home controls, and more."

https://www.hodinkee.com/articles/us-smartwatch-sales-are-soaring-2019