Move over, Amazon. A new competitor appears to be swiftly becoming the most satisfying name in Internet retail: Costco.

That's according to the American Customer Satisfaction Index, which interviews 300,000 customers annually about more than 400 companies in 46 industries to measure customer satisfaction for the quality of products and services.

Costco notched an ACSI score of 83 this year in the first time it's been scored in the Internet retail category on the report. It received the same rating for the in-store department/discount and supermarket categories. Meanwhile, Amazon scored 82, dipping three points from the previous year.

Amazon had been the top leader on the index since 2010. However, the report says "its retail business growth has slowed with the acquisition of Whole Foods," which Amazon purchased for $13.7 billion in 2017.

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While consumers were the most satisfied with Internet retail, the overall level of satisfaction across the category dipped from an ACSI score of 82 in 2017 to 80 in 2018.

Overall, 21 new companies made their debuts in the Internet retail category. Among these new companies, the best-performing ones after Costco were Etsy, Kohl’s, Nike and Nordstrom, which each had an ACSI score of 81. However, not all new companies in this section performed well: Sears and Walmart bottomed out the list with scores of 73 and 74, respectively.

According to the report, of all the vehicles for online shopping, mobile apps are highly favorable among customers – scoring an 86 for quality and an 85 for reliability. While the ease of a desktop checkout and payment process is at an 85, that is down two points from last year, when it was at an 87.

Follow USA TODAY intern Ben Tobin on Twitter: @TobinBen