Hey, Google, order a large pizza! Alexa, I need vitamins!

Voice shopping using smart speakers and smartphone apps is starting to gain traction among consumers, opening up a new “conversational commerce” channel and potentially disrupting the retail sector.

Devices such as Amazon’s Alexa-powered speakers and Google Home, which use artificial intelligence to respond to voice commands, are offering new choices to consumers who are looking for more convenient ways to order goods and services.

Voice shopping is expected to jump to $40 billion annually in 2022 in the United States, from $2 billion today, according to a survey this year by OC&C Strategy Consultants.

“People are liking the convenience and natural interaction of using voice,” said Victoria Petrock of the research firm eMarketer.

“Computing in general is moving more toward voice interface because the technology is more affordable, and people are responding well because they don’t have to type.”

A recent eMarketer survey found 36 percent of US consumers liked the idea of using a home-based assistant like Amazon Echo for making a purchase.

Amazon’s devices, which hit the market in 2015, were designed in large part to help boost sales, and Google Home was launched a year later.

The use of smart speakers has expanded the possibilities available through smartphone chatbots or text-based systems including those from Facebook and Apple.

The “conversational interface” is a tremendous advantage in some situations, said Manlio Carrelli, executive vice president at LivePerson, which provides technology for firms in online platforms.

“This is like ‘Star Trek,’” Carrelli told AFP. “I can just say what I want and get it. Consumers don’t care what’s on the back end, they just want to be able to get what they want.”

Carrelli said these systems are important not only for sales, but for customer service — reducing the need for dreaded call centers and saving millions for businesses.

“We’re now entering the mainstream for this market,” Carrelli said. “I don’t think you’ll find a single major brand that isn’t looking at this.”

Walmart last month launched a text-based concierge shopping service called Jetblack which uses both artificial intelligence and professional assistants offering buying suggestions as part of its effort to compete with Amazon.

But Walmart is one of dozens of retailers offering voice-based shopping through Google Express as well, along with sellers of flowers, hardware, groceries and other goods.

Domino’s Pizza has embraced this technology, allowing orders through Amazon Alexa, Google Home, Facebook Messenger and other platforms.