Amazon.com Inc.’s Prime Day sale helped boost online spending across all retailers in the US by 30.3% to $24.1 billion, according to Adobe Inc., topping its estimate for 28.4% growth for the period ending July 11.

The figures apply across all online retailers for Amazon Prime Days. Tariffs and economic uncertainty are on the minds of shoppers as they prepare for Amazon's summer Prime Day sales. But at least one company is forecasting that sales for the online sales event will break records as budget-conscious shoppers look for deals.

Amazon (NASDAQ:AMZN) announced on Saturday that its Prime Day event, which ran from July 8 to July 11, was its biggest Prime Day event ever, as shoppers enjoyed billions of dollars in savings from deals spanning over 35 product categories.