Cart Reserve – Inventory Holds

Name: Cart Reserve – Inventory Holds
Brand: R3stack
Rating: 5.0 (4 reviews)

Pricing: Free plan available. Free trial available.
Rating: 5.0 (4)
Developer: R3stack

Install

Cart and dashboard showing an active inventory hold

Reserve stock at add to cart, verify it at checkout, and release expired holds automatically.

Cart Reserve holds available inventory when a shopper adds a protected product to cart. Each reservation is tied to a signed session and verified again at checkout. The storefront timer reflects the active hold, and expired reservations return to stock automatically. Use Cart Reserve for limited stock, one-of-one products, restocks, flash sales, and product drops. Fair queues, scheduled drops, bot controls and analytics help manage demand. We tailor setup to your theme.

Real inventory holds update available stock at add to cart
Checkout validation ties each purchase to an active reservation
Expired holds release automatically for the next shopper
Fair queues, scheduled drops and bot controls help manage traffic spikes
Live analytics and theme-tailored setup with hands-on support

Languages

English

Works with

Checkout
Shopify Admin

Pricing

Choose the plan that best fits your business.

Free

Features

3 protected products
25 concurrent active holds
Unlimited reservations
Checkout validation
Fixed 10-minute reservation timer
24-hour analytics history
Hands-on setup support

Starter

$25 / month

or $250/year and save 17%

Features

All Free features
100 protected products
100 concurrent active holds
Bulk product selection
Fair queue for traffic spikes
Rule-based bot protection
Configurable reservation timer
7-day analytics history

14-day free trial

Pro

$69 / month

or $690/year and save 17%

Features

All Starter features
500 protected products
500 concurrent active holds
Advanced fair queue
AI-powered bot protection
Full storefront customization
30-day analytics history

14-day free trial

Max

$149 / month

or $1,490/year and save 17%

Features

All Pro features
ALL mode — unlimited products
Auto-protect new products
2,500 concurrent active holds
AI + IP and country protection
Global inventory limits
90-day analytics history

14-day free trial

All charges are billed in USD. Recurring and usage-based charges are billed every 30 days.

Reviews (4)

Overall rating

Counts per rating level

100% of ratings are 5 stars
4
0% of ratings are 4 stars
0% of ratings are 3 stars
0% of ratings are 2 stars
0% of ratings are 1 stars

All reviews

July 9, 2026

Excellent service, Cart reserve works well with our shop., We had a few issues and Adam at support not only was on the case immediately he implements changes and also partnered with us and helped set the design on our web site then tested all pages to make sure everything was working correctly.
After service is brilliant and the product works very well. I recommend this app highly and will be using constantly.

TheHumFromTheHill

United Kingdom

28 days using the app

July 9, 2026

This app is the BEST cart reserve app I've used. It works as you WANT it to and looks really pretty too.

I have tried EIGHT different cart reservation apps before this one, but they were always focused on driving sales and not ACTUALLY saving the cart so my customers have time to check out.

Adam reached out to me, and i've been working closely with him since. The app is near perfect, the support is insanely prompt and detailed, and you can tell Adam has a lot of experience and passion for this. Take it from me and don't waste your time with any other "cart reserve" app as they don't actually reserve the cart.

This app is a god send for small business such as myself who handmake everything and only have limited stock on restocks which sell out quickly!

1 million / 10 reccomend

The Frame Game AU

Australia

14 days using the app

June 15, 2026

World-Class Support from Adam! Brilliant App, Just Mind Extreme Flash-Sale Use Cases

I am leaving this review to highly commend Adam from the tech support team, who provided some of the best, most responsive customer service I have ever experienced on Shopify. He went above and beyond to help us configure the app.

The app itself is beautifully designed, highly intuitive, and I have no doubt it works flawlessly for the vast majority of standard retail stores looking to reduce cart abandonment.

The only reason we ultimately had to uninstall is due to our highly unique, high-velocity business model. We run high-demand product "drops" where hundreds of customers flood the checkout at the exact same millisecond. In these extreme, high-traffic spikes, we found the reservation system couldn't quite keep pace with Shopify's core inventory servers, leading to a few checkout mismatches for our buyers.

While it wasn’t the right fit for our specific flash-sale chaos, I cannot fault the app's build or the incredible support team behind it. If you run a standard e-commerce store, this app is fantastic. Huge thanks again to Adam for all his hard work and dedication!

Jukupop

United Kingdom

5 days using the app

R3stack replied June 18, 2026

Thank you for such a thoughtful and fair review, it really means a lot.

You're right that the version you used wasn't built for hundreds of simultaneous checkouts on the same product. A major update is in progress that redesigns how reservations interact with Shopify's inventory system, specifically for high-concurrency flash sales like yours.

When it's live, the door is always open — I'd love for you to give it another try. Thanks again for the kind words and for helping make the app better.

Adam — Cart Reserve