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Google’s Universal Cart Is Changing Shopping — How Can Brands Stay Competitive?

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Hello, I’m Mia Sato, an AI Researcher at GDX.

I recently came across Google’s Universal Cart, which has started rolling out in the U.S. It lets shoppers collect products they discover through Google Search and Gemini from different retailers in one place.

My first reaction was that this sounded convenient. Anyone who shops online knows how quickly browser tabs multiply, and how easy it is to forget which store had which product.

But after reading Google’s explanation, the single-cart idea was no longer the part I found most interesting.

The bigger change is what happens after a product has caught our attention. We compare it with alternatives. We wait for a price drop. We wonder whether to buy now or keep looking. If Google and AI begin helping with that period of indecision too, the role of the retailer may start to change.

A shopping cart has never been only about checkout

When I shop for clothes online, adding something to my cart does not necessarily mean I am ready to buy it.

I may compare another color, look at a competing brand, check the shipping fee, or decide to come back over the weekend and then forget about it entirely.

That behavior is probably familiar to many shoppers. A cart is the gateway to checkout, but it is also a temporary place to keep products we are still considering.

This is one reason e-commerce sites developed wish lists, persistent carts, abandoned-cart emails, price-drop alerts, and back-in-stock notifications.

Retailers may treat those as separate CRM or marketing tactics. For the customer, however, they all solve the same problem: helping them remember and reconsider products they have not made a final decision about.

Seen from that perspective, Universal Cart feels less like Google inventing a completely new shopping behavior and more like Google bringing together the remembering, comparing, and waiting that used to happen across different stores and browser tabs.

Google is moving into the decision-making stage after discovery

Universal Cart does more than save products from multiple retailers. It can monitor price drops and restocks, surface promotions, and show benefits linked to different payment methods.

In one example shared by Google, a shopper putting together a custom PC can add several components to the cart, while AI checks whether the parts are compatible and suggests alternatives when needed.

I have never built my own PC, but the hesitation behind that example feels familiar. When buying clothes or electronics, I still wonder whether the size is right, whether the price might drop next week, or whether another option would suit me better.

Google has traditionally helped shoppers find products. Universal Cart suggests that it also wants to stay involved after discovery, while people are still deciding what to buy.

And shoppers do not have to commit to one retailer while they are making that decision. Products from several brands can remain side by side until the choice is made.

E-commerce teams have traditionally focused on what to do once a shopper adds an item to their own cart. But if comparison and price watching increasingly happen on Google, products may move in and out of consideration while the customer is nowhere near the retailer’s website.

To me, that is a more important change than the convenience of having one cart: part of the pre-purchase decision process is moving outside the brand’s own storefront.

Can your product stay on the shortlist?

In an earlier article, I wrote about how retailers can structure product information so that AI systems can understand what they sell.

Read the earlier article

Universal Cart made me think about what happens after a product has been discovered.

Being surfaced by AI-powered search is only the first step. If important details are missing when the shopper begins comparing options, there is no guarantee that the product will remain under consideration.

Suppose I am shopping for sneakers. I may like the design, but if I cannot tell whether my preferred color is in stock or the sizing information is vague, I am likely to move on. Even an attractive price may not be enough if delivery timing or return conditions are unclear.

So this is about more than improving product titles and descriptions. Size, color, availability, price, delivery terms, and other details that matter during comparison need to be accurate and accessible wherever that comparison happens.

This is not some special trick for getting selected by AI. It is largely the same e-commerce discipline retailers have always needed, except that the information now has to work well beyond the retailer’s own site too.

Better product data will not guarantee a place on the shortlist. But being eliminated because inventory information is stale or the product details are confusing is something retailers should try to avoid.

And that raises another question: if the shopper finally decides to buy, where does the transaction actually happen?

“Bring them back to our website” may no longer be the whole strategy

My first instinct was that the main challenge would be getting people who compare products on Google to complete the purchase on the retailer’s own site.

Universal Cart makes that picture more complicated.

For products from participating retailers, shoppers may be able to complete the purchase directly on Google using Google Pay. In other cases, the cart is handed off to the retailer’s site for checkout.

In other words, there is no single place where every purchase has to finish.

Once I understood that, I started to question whether getting every customer back onto the retailer’s own website should remain the only goal.

When shoppers do continue to the retailer’s site, the handoff matters. If I have already chosen a product on Google and arrive at the retailer’s site only to find an empty cart or have to search for the item again, the experience would feel unnecessarily frustrating.

Google’s Cart API documentation explains how participating retailers can carry cart contents into their own checkout flow. If that connection is available, the transition should feel as seamless as possible.

But a smooth handoff alone is not a reason to choose one brand over another.

As prices become easier to compare, other parts of the offer become more visible: membership benefits, reliable delivery, easy returns, in-store support, and the confidence that help will be available after the purchase.

I would make the same choice myself. If two stores sell the same product at the same price, I am more likely to buy from the one that seems easier to deal with if something goes wrong later.

If checkout happens on Google, retailers may have fewer opportunities to communicate those strengths on their own website before the sale. But Google explains that the retailer remains the seller in either flow. The relationship with the brand does not disappear simply because Google helped facilitate the purchase.

That suggests a broader objective: not only deciding where checkout should happen, but making sure customers feel they made the right choice regardless of how they bought.

The brand experience continues after the sale

Imagine discovering a brand for the first time on Google and buying one of its products without ever visiting the brand’s website.

Until the package arrives, you may know almost nothing about the company.

In that situation, the clarity of the order confirmation, shipping communication, packaging, and the experience of receiving and using the product may become some of the first meaningful brand touchpoints.

Is it easy to get help if something goes wrong? Will the customer remember the brand next time? Is there a membership program, app, store, or another reason to stay connected?

None of this is completely new. It sounds a lot like traditional CRM and customer support. But as more of the pre-purchase journey happens outside the retailer’s own website, the quality of post-purchase touchpoints may become even more important.

Of course, what customer information a retailer can use from a Google-originated order, and what follow-up activities are possible, will depend on the integration and the customer’s consent. Brands cannot assume they can use that data however they like.

That is why technical integration and the post-purchase experience should be designed together rather than treated as separate projects.

Researching Universal Cart broadened the question for me. It is no longer only about how to make sure AI can discover a product.

The product needs to remain competitive during comparison. Customers who reach the retailer’s site should not encounter unnecessary friction. And customers who buy through Google should still have a reason to value and remember the brand.

The paths to purchase may differ, but from the customer’s point of view they still add up to one brand experience.

Universal Cart began rolling out in the U.S. in October 2026, so I have not been able to test it myself. I will be watching how it develops in practice and whether it eventually expands to Japan.

But the announcement has already added one question to the way I think about e-commerce: after AI helps a customer choose our product once, what will give that customer a reason to choose us again?

For me, that question is ultimately more important than the cart itself.

References

Parts of this article were created with the support of AI and then reviewed and edited by the author. The views expressed are the author’s own and do not represent an official statement or position of GDX Inc.