Shopify's Shop Now Syncs Carts and Browsing Across Devices

Shop is the app and account behind Shop Pay, order tracking and Sign in with Shop. Until now it mostly came into play at checkout. It now steps in earlier: if a shopper has a Shop account and Shop recognises them, it can identify them on your storefront while they are still browsing, keep their cart in step between their phone, their laptop and the Shop app, and record what they looked at in their Shop account. Shopify says the feature is now supported on all browsers.

Shopify pitches it to merchants as a conversion feature: faster checkout, a Shop Pay button pre-filled with the shopper's last-used card, and reminders about abandoned carts sent by Shop. All of it is on by default for Shop users, which is why UK stores should look closely. A Shopify service is now recognising visitors and collecting their browsing activity on your storefront, and your privacy information and cart recovery flows were almost certainly written before it did.

How it works

The Shop app customer experience page in Shopify's Help Center sets out two conditions for shopping activity to sync. The shopper must have a Shop account, and they must either be recognised by Shop or be signed in on your store. Shoppers without a Shop account are not affected at all. For shoppers who have one, sync is activated by default.

Cart sync then works through three routes, and the third is the new part:

• Signed in with Shop. The shopper has signed in to your online store using Shop.
• Matching customer account. Your store uses customer accounts and the shopper is signed in with the same email address as their Shop account. This route does not work with legacy customer accounts.
• Recognised across sessions. The shopper signed in with Shop during another browsing session, so Shop recognises them even though they have not signed in on your store this time.

Once a cart syncs, it moves in both directions between the Shop app and your storefront. It also follows the shopper between devices on your own store, so items added on a phone are in the cart when the same person opens the store on a computer. The changelog adds the checkout side: checkout loads faster for recognised Shop users, signing in to a customer account takes one tap, and the Buy with Shop Pay button shows the card the shopper last used.

Browsing activity is the other half. It syncs to the shopper's Shop account so that Shop can resurface products they viewed and carts they left behind. Shop's own search draws on it too: the Help Center lists shopping history, including activity syncing, among the signals that personalise a shopper's search results in the app. Shopify's consumer privacy policy describes the same flow from the shopper's side. It says that when a person browses or shops with merchants, Shopify receives information about their activity on those sites "whether or not you are logged in with Shop or Shop Pay on the Merchant store", including their browsing and search activity and what they place in their cart.

Examples / Use cases

Device switching is the clearest win. Someone looks at a sofa on their phone at lunchtime, adds it to the cart, and comes back that evening on a laptop. Without cart sync, the laptop shows whatever cart that browser last held, usually an empty one. If they have a Shop account and Shop recognises them, the cart is now waiting, and the Shop Pay button is ready with their usual card. For considered purchases that are researched on mobile and bought on desktop, that removes a step where people drop out.

The Shop app also becomes a second way into the same cart. A shopper who finds your products in Shop, adds them to a cart and then follows a link to your site arrives with that cart in place, provided Shop recognises them, and it works the other way round too. Brands that sell Shop-exclusive products should note one quirk: a cart holding a Shop-exclusive item still syncs to your storefront, but the item cannot be bought there. Expect the odd customer service question if you run exclusive drops through Shop.

The third case is the one with no obvious button. A visitor who signed in with Shop during an earlier session, but has not signed in on your store, browses your products. Shop can now recognise them, add what they viewed to their Shop account, and remind them later about a cart they left. Shopify describes this as helping merchants "close the loop on conversions". It also means part of your cart recovery is now run by Shopify, on Shopify's timing, alongside whatever you already send.

What this means for UK merchants

Start with your privacy information. The Help Center describes Shop Pay and Shop sign-in as "a direct service from Shopify to consumers", and says that if you activate them on your storefront, Shopify collects associated data directly from Shop users, including as they browse your storefront after signing in with Shop. Recognition and activity sync are now on by default for those users. The ICO's guidance on complying with the PECR rules for storage and access technologies, finalised in April 2026, is clear about where responsibility sits. In most cases the service provider, which here means the store, has primary responsibility for PECR compliance, including the decision to incorporate third-party features. The same chapter says you must tell people about any third parties that store or access information on their device and what they do it for, and you must not rely on vague references to "partners" or "third parties".

In practice that means three checks. First, does your privacy notice name Shopify and Shop, explain that Shop can recognise returning Shop users and sync their browsing and cart activity to their Shop account, and link to Shopify's consumer privacy policy? Second, does your cookie information list what Shop sets or reads on your storefront? Shopify has not said which technology the recognition relies on, so this needs checking on your own store in a browser, which is the kind of audit the ICO recommends anyway. Third, has your cookie banner been tested with Shop Pay and Sign in with Shop switched on, so you know what loads before a visitor makes a choice? Whether Shop's recognition falls under one of PECR's exceptions or needs consent, and how controller roles divide between you and Shopify, are questions for your privacy adviser. This is our reading of the guidance, not legal advice.

Then look at cart recovery. Many UK Shopify stores already send abandoned cart or abandoned checkout messages, through Shopify Messaging or an email platform. Shop now sends its own reminders to Shop users who leave a cart. Shopify has not said what form those reminders take or how soon they go out, so a Shop user could hear from Shop and from your own flow about the same basket. If your recovery emails lead with a discount code, a shopper who gets both messages may feel chased twice. Review the timing and wording of your flows before Black Friday.

The upside is real for stores where Shop Pay already accounts for a large share of checkouts. Fewer sign-in steps, a cart that survives a change of device and a pre-filled payment button all address friction points that come up repeatedly in conversion rate optimisation work on Shopify checkouts. Shopify calls the result a "higher-converting checkout", but it has not published figures for this change, so judge it on your own numbers.

Practical considerations

The Help Center page does not describe a separate merchant setting for switching activity sync or cart sync off. The choice it does describe is whether to activate Shop Pay and Shop sign-in at all, and turning those off would also remove an accelerated checkout many returning customers use. For most stores the sensible route is to keep Shop Pay and update the privacy information around it.

Check which customer accounts your store runs. Email-matched cart sync only works with the current customer accounts, not the legacy version, so a store still on legacy accounts gets cart sync only for shoppers who sign in with Shop or are recognised by it. If a Shopify rebuild or migration is on your roadmap, make the move to current customer accounts part of the brief, so the new store supports all three cart sync routes from launch.

Know the limits. Cart sync does not combine carts: if a shopper already has a cart where they are shopping, that cart is not replaced and only one syncs, so someone with items in two places may find some of them missing. Sync can also be limited by region, and a cart created in one region might not follow a shopper who shops from another. That matters for stores selling into several markets and currencies, a set-up that became easier to run when Shopify removed the eight-currency limit on Shopify Payments payouts in July. Test what a synced cart does when a shopper switches market before relying on it for international customers.

Finally, expect some movement in your reports. A journey that used to show as an abandoned cart on mobile may now complete in one cart on desktop, and some recovered sales will be prompted by Shop rather than by you. Shopify has not said how those recoveries are attributed, so read abandoned checkout and recovery figures after 5 October with care. They have already shifted once this year, when Shopify stopped logging bot card-testing sessions as abandoned checkouts, so compare like with like. To see the change for yourself, sign in with Shop on one device, then open your store on a second.

Your policy pages sit in the same checkout footer that recognised Shop users pass through, and Shopify can now keep them in step with your settings. We cover what that fills in, and what UK stores still need to check, in our post on Shopify's automated store policies.

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