Kroger's new "Scan, Bag, Go" technology allows customers to scan and pay for goods as they shop.
The grocery chain is rolling it out to 400 stores in 2018.
Amazon revealed plans in December to introduce a similar technology to its own brick-and-mortar grocery concept, called Amazon Go, which is still in the planning phases.
Walmart is also testing its own cashier-less technology in more than a dozen stores in Texas, Florida, South Dakota, Arkansas, Georgia, and Kentucky.