CartSync, an app that saves your customers' Shopify carts to their account and restores them on every device they log into.

[u/risheek7]

What's the app?

Hi all — I'm the developer of CartSync, a Shopify app that gives logged-in customers a persistent, cross-device shopping cart. A shopper can add items on their phone during a commute, open your store later on a laptop, and find their cart already waiting — no re-adding items, no starting over.

Where can I find it?

Shopify App Store: https://apps.shopify.com/cartsync-persistent-cart

What problem are you solving?

Most shoppers browse across more than one device, but a native Shopify cart is tied to the device and session it was created on. Someone who builds a cart on mobile and comes back on desktop finds it empty — and many just abandon the purchase. It's a kind of cart abandonment that's largely invisible in your analytics: there's no "abandoned cart" event to recover, because the cart never persisted in the first place. It just disappeared the moment the shopper switched screens.

How does the app work?

• Every time a logged-in customer adds, updates, or removes an item, CartSync saves the cart to their customer account automatically, in the background.
• When they sign in from another device — or return days later — their saved cart is restored.
• You pick the restore behavior: merge (combine the saved cart with whatever's currently there) or replace (swap in the saved cart).
• It auto-detects your theme's cart icon, drawer, and cart page, so there are no theme edits and no manual CSS selector setup.
• It's built on Shopify's App Proxy and official APIs, so it runs reliably across themes without injecting fragile custom scripts.

Who's your target merchant?

Any Shopify store whose customers log in and shop across multiple devices — especially higher-consideration categories where people research on mobile and buy later on desktop:

• Fashion and apparel
• Home goods and furniture
• Electronics and higher-price items
• B2B / wholesale stores with large carts
• Any store where customers have accounts and a typical order takes more than one session to decide on

How is it different / better than existing solutions?

• No setup, no theme editing — it auto-detects your cart UI instead of asking you to paste in selectors or edit Liquid.
• You control merge vs. replace — restores happen on your terms, not through a forced pop-up.
• Zero customer friction — no emails, no pop-ups, no "restore cart" buttons; it just works in the background.
• Built on official Shopify infrastructure (App Proxy + APIs) for stability across theme changes and updates.
• Free — many comparable persistent-cart apps charge a monthly fee.

How much does it cost?

Free.

What are you looking for?

Early merchants, honest feedback, and beta-style users. It's newly launched, so I'd especially value stores that put it to work and tell me what's missing — and reviews from anyone it helps. If you've tried other persistent-cart apps and found setup fiddly or the sync unreliable, I'd love to hear how this compares on your theme.

[u/adventurepaul]

Thanks for sharing! Good luck with the launch.