Free Persistent Cart ‑ Relay vs CartSync ‑ Persistent Cart
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for Free Persistent Cart, Sep 11, 2026 for CartSync.
The short answer
- On the Shopify App Store: Free Persistent Cart 5.0 from 4 reviews and CartSync 5.0 from 3 reviews.
- Free Persistent Cart and CartSync list the same 1 features.
Head to head
- France
- India
- Japan
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureShoppers 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.
CartSync saves every logged-in customer's cart and restores it on any device — automatically. Set merge or replace mode, sync in the background on every cart change, and send automated emails for price drops, back-in-stock alerts, and idle carts. Connects to Klaviyo or your own SMTP. Works with any Shopify theme, no code required. Built with official Shopify APIs.
- 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
- Saves logged-in customer carts to their account automatically
- Restores saved carts on any device a customer signs in from
- Choose merge or replace when a saved cart is restored
- Syncs in the background on every cart add, update, or remove
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Free Persistent Cart |  CartSync |
|---|---|---|
| Detected stores | 8 | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Home & Garden, Apparel & Accessories, Electronics | Not published |
| Top store countries | France, India, Japan | Not published |
Reviews
| Measure | Free Persistent Cart | CartSync |
|---|---|---|
| App Store rating | 5.0 ★ | 5.0 ★ |
| App Store reviews | 4(ahead) | 3 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Free Persistent Cart | CartSync |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | No monthly plan listed | No monthly plan listed |
| Longest free trial | Not listed | Not listed |
| Plans listed | Not published | Not published |
Listing
| Measure | Free Persistent Cart | CartSync |
|---|---|---|
| Shopify category rank | #64 | #49(ahead) |
| Shopify App Charts | #25 in Abandoned cart | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 27, 2026 | May 6, 2026 |
| Languages | 1 | 1 |
| Developer | Flywheel Systems | ecom |
FAQ
Free Persistent Cart and CartSync: common questions
- Which has better reviews, Free Persistent Cart or CartSync?
- On the Shopify App Store: Free Persistent Cart 5.0 from 4 reviews and CartSync 5.0 from 3 reviews.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 9, 2026 for Free Persistent Cart, Sep 11, 2026 for CartSync; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 9, 2026 for Free Persistent Cart, Sep 11, 2026 for CartSync. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.