---
title: "Cart Relay ‑ Persistent Cart Shopify App Profile"
description: "Shoppers browse on a phone and buy on a laptop. Cart Relay saves a signed-in customer's cart against their customer account and puts it back when they sign in on another device. No link to click, no code to enter. If the second device already has a cart, the two are combined: quantities of shared items add up and no line is dropped. Signing out clears that browser's cart and keeps the saved copy, so a shared computer stays private. Setup is one app embed in your theme — nothing to configure."
canonical_url: "https://shoplist.co/shopify-apps/cart-relay"
markdown_url: "https://shoplist.co/shopify-apps/cart-relay.md"
last_updated: "2026-09-21"
entity_type: "shopify_app"
slug: "cart-relay"
source: "public Shopify app profile allowlist"
---

# Cart Relay ‑ Persistent Cart Shopify App Profile

> Shoppers browse on a phone and buy on a laptop. Cart Relay saves a signed-in customer's cart against their customer account and puts it back when they sign in on another device. No link to click, no code to enter. If the second device already has a cart, the two are combined: quantities of shared items add up and no line is dropped. Signing out clears that browser's cart and keeps the saved copy, so a shared computer stays private. Setup is one app embed in your theme — nothing to configure.

## Quick answer
Cart Relay ‑ Persistent Cart has 0 detected stores in Shoplist. This Markdown profile displays 0 public brand examples; it is not a complete customer list.

## Key facts
- Name: Cart Relay ‑ Persistent Cart
- Monitoring status: First-adopter watch
- Developer: Flywheel Systems
- Developer profile: https://shoplist.co/app-developers/flywheel-systems
- Shopify App Store URL: https://apps.shopify.com/cart-relay
- Launch date: August 27, 2026
- Shoplist category: Abandoned cart
- Rating: 5
- Review count: 4

## Pricing summary
Free

Shoplist has not yet found reliable public storefront evidence connecting a Shopify store to this app. This does not mean the app has no users. Some apps are new, admin-only, server-side, theme-independent, or otherwise difficult to detect from public storefront signals.


## Public callouts
- Unlimited cart syncs between phones, laptops and browsers
- Setup is one theme app embed — no code, and nothing to configure
- Two carts merge automatically: quantities add up, no line is dropped
- Sign-out clears the cart from that browser and restores it at next sign-in
- See cart syncs, orders from synced carts and their order value
## Shopify App Store categories
- Abandoned cart

## Data note
Profile updated: September 21, 2026. This is the profile revision date, not a guarantee that every store was checked on that date.
Public snapshot built: 2026-10-13 11:49:39.326139\+00
Detection metrics refreshed: 2026-10-13 11:49:39.326139\+00
Public app evidence date: 2026-09-21 23:24:42.102704\+00
This generated Markdown profile intentionally exposes only public, stable app-profile fields and a small public app-stack sample from Shoplist. It excludes private contact data, people data, internal scores, crawl provenance, full datasets, and unstable operational fields.

## Related links
- [HTML app profile](https://shoplist.co/shopify-apps/cart-relay)
- [Shopify apps directory](https://shoplist.co/shopify-apps)
- [Shoplist data methodology](https://shoplist.co/data-methodology.md)