Casper ‑ Cart Sync

Develop by Outis

$15-$35

/ Month

Built for Shopify

Free plan available 5 Days Free Trial

Increase sales by keeping customers' carts on all devices

Track and sync

Detailed history logs

Month-long cart retention

Seamless cart sync

Effortless integration

Persistent cart

About Casper ‑ Cart Sync

Launched Jun 27, 2022

Built by Outis

Email :

[email protected]

Address

Lons-le-Saunier, FR

Website Privacy policy

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Description

Casper adds a persistent cart to your store so customers never lose what they started

Casper runs silently on every page of your store, syncing carts for logged-in customers across all their devices. Cart updates are detected automatically, and carts stay active for up to 30 days, even when switching browsers. By avoiding pop-ups or disruptions, Casper keeps the buying experience smooth. It helps prevent lost checkouts by making sure customers always find their cart when they return.

Keep carts synced for logged-in customers across all devices
Save each customer’s cart automatically as they add or remove items
Option to clear the browser cart when customers log out
Track cart changes to better understand customer behavior
No pop-ups, no setup, Casper runs quietly on every page

Pros

Increases sales by keeping customers' carts synced across all devices
Enhances shopping experience with a persistent cart, contributing to smoother shopping journeys
Ideal for merchants of any size, from small shops to large wholesale operations
Boosts conversion rates and builds customer loyalty
Tracks and syncs carts across devices with detailed history logs
Extends cart retention to a month, surpassing Shopify's 15-day limit
Seamless integration with store themes
Effortless activation with just a few clicks

Top Helpful Reviews

Pierre Belvédère

Jun 17, 2025 on Shopify

The app works really good! We suffered an incovenience and the customer support solve that really quickly! improving also their application. We are really happy that we can offer a better experience for our customers.

AvafinaPet

Jun 11, 2025 on Shopify

App is working well - I had a little hiccup but I reached out to customer service and they replied in under a day, and were able to help out. Very friendly service- Definitely recommend.

Nash Trade (Euro)

Jun 04, 2025 on Shopify

This app is a game-changer - well-priced, incredibly effective, and solves a major shortcoming in Shopify’s native functionality. Since implementing it, we've seen a significant boost in customer satisfaction. Clément is highly responsive and has even implemented new features based on our feedback. Couldn't recommend it more - truly a 10/10 experience!

Coast Direct

Mar 21, 2025 on Shopify

Pooff just like that, carts were disappearing. Can you imagine Shopify tokenizes carts and doesn’t sync them across accounts? I know it’s hard to believe. In comes Casper, and without any issues, it just works. Carts are now synced effortlessly between devices for our logged in users. Definitely recommend.

Country Life

Jan 28, 2025 on Shopify

Nice app, working as expected. Plus, we received quick and helpful support when dealing with a problem specific to used theme (Trade theme). Thanks Clément, nice work

Eaata.pro

Nov 13, 2024 on Shopify

I had an issue and I received a fast and good answer, even a follow-up of the situation till they solve it. Thanks Clement

Platanomelón

Jul 25, 2024 on Shopify

A simple yet effective app for a very much needed feature that Shopify lacks, and keeps belittling as of today. Clément offered outstanding support and event took our feedback to improve the app, something bigger App developers usually don't do. A must have for any store in my opinion, from small to Plus ones.

Martie

Jul 23, 2024 on Shopify

Very easy to install and use. Of all the apps that claim to do this function, we found Casper to be the best. Easy to contact the developer directly with questions.

Primary.com

Feb 20, 2024 on Shopify

Such a simple solution to such a silly Shopify limitation. Incredibly easy to install and get going. Carts are now syncing across multiple devices, including items with line item properties.

CleverPlato

Feb 15, 2024 on Shopify

The app works perfectly for synchronizing your cart on multiple devices. I highly recommend this app for this purpose! Thank you Clément for your outstanding customer support too, much appreciated!

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