Cart Block: checkout validator

Develop by Shopify

$3.99-$7.99

/ Month

Built for Shopify

Free plan available 7 Days Free Trial

Block or validate purchase in product, cart and checkout page

Real-time validation

No coding needed

Customizable conditions

Fraud protection

Display warnings

About Cart Block: checkout validator

Launched Feb 01, 2024

Built by Shopify

Address

151 O’Connor St, Ottawa, ON, ON, CA

Website Support Portal Privacy policy Tutorial FAQ Document

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(39 Reviews)

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Description

CartBlock validates or blocks any order, protects from bots and frauds using multiple conditions

CartBlock's customizable conditions allow you to set specific rules, blocking purchases an orders based on criteria like product quantity, country, customer profiles, discount code and much more making it the perfect solution for blocking customers or bots. It maintains transparency through warnings and messages at critical points, ensuring customers are well-informed. A smart dynamic Captcha with single or multiple conditions can be added to the checkout.

Block or validate purchases/orders by multiple rules.
Display warnings and messages on product pages, cart pages, and during checkout.
Bots Block: protect your store from fraudulent transactions
Smart Dynamic Captcha in the checkout with single or multiple conditions
Multichannel support: in-app chat, website resources and social media engagement

Pros

Allows customizable conditions for blocking and validating purchases based on criteria like country, product quantity, customer profiles, and discount codes
Powered by Shopify Functions technology, ensuring real-time validation and easy, no-coding integration
Provides transparency through warnings and messages at critical purchase points, informing customers proactively
Helpful for preventing fraudulent transactions, as evidenced by a user successfully stopping card testing attempts
Built using 'Native Shopify Functions' ensuring faster and more integrated performance
Offers multichannel support including in-app chat, website resources, and social media engagement
Responsive and helpful customer support as highlighted by user experiences

Cons

Might require some initial setup and communication with customer support to ensure it meets specific needs, as experienced by a user
It appears that updates may be needed occasionally which could require interaction with customer support

Top Helpful Reviews

Vaonis

Oct 03, 2025 on Shopify

The app is incredibly easy to use, even with the complex constraints of my shop setup. What impressed me most was their responsiveness: the support team was quick to understand my needs and helped me get everything running smoothly in no time. Highly recommended!

3BR Powersports

Jul 29, 2025 on Shopify

Great customer support. Actually AMAZING customer support. I was unable to get a validation tuned to effectively block a BOT attack. Customer support tech Andrea set up an online call where we worked through the process to arrive at solution. He spent the time to get it right and then stay on the line to test the validation to ensure that it worked correctly. Five stars isn't high enough for this kind of support.

3BR Powersports

Jul 20, 2025 on Shopify

Update - All good. The reason I couldn't get through is timing. While it was Friday in my time zone it was the weekend there. Support has contacted me and we are working toward a solution Reviews indicate excellent support but I can't get past the screen that only shows How To videos. My first attempt at a validation blocks ALL cart entries. I need help fixing it but can't get any useful help. I know I'm doing something wrong but I don't know what

Springfield Leather Co

Jul 11, 2025 on Shopify

There are a few things that can be tricky to set up...BUT FEAR NOT!! This support staff goes above and beyond to make sure you have the settings just right. Sometimes it takes a couple Validations to get things set up. The only way you are getting frustrated is if you don't use the in app chat to get connected to those who can help you most. Can't figure it out...they will help! Great features and works flawlessly so far!

Seven Potions

Jun 05, 2025 on Shopify

I just started using the app and I don't know whether it's going to work or not but the support I received from the developer was the best experience I had with any app on shopify. 5 stars for the support and hopefully 5 stars for the app

LuxeWell Life

Jan 31, 2025 on Shopify

I have a few products marked as $0 in my store because I am not permitted to put the pricing online, and even though I customized the "Add to Cart" button to say "Contact for Pricing", people would still click and check out these items at $0 (products have a $4,000-$14,000 value range). This app allowed me to set a rule that products below $1 cannot be checked out and it completely stopped the $0 orders! Took me about 3 minutes to set up once I installed the app, super easy!!

PlantsInTheCity

Dec 06, 2024 on Shopify

Fabio has been so helpful in getting us set up to use cartblock. Our situation was a bit complicated, and he sorted it all out for us! This app does exactly what it says..it provides a clean way to block customers from checking out based on rules you set up.

MicroAvionics

Jul 16, 2024 on Shopify

I stumbled across this APP. For me it is fantastic and after 1 week of using it it has generated some good income which I was not having before. For me a wanted to block certain products from being sold to specific countries, rather than blocking the entire country. Shopify as standard blocks the whole country by removing the specific country from checking out..... however Cart Block does it differently. Well worth the monthly fee. Tech support was great. I had to use theor tech support and I was quickly invited to a video call and within a few hours the initial issues were sorted and the APP was creating turnover! Thanks for writting a great APP.

First Holistic

Jul 13, 2024 on Shopify

This a very promising app and beneficial for merchants who need to block certain customers or orders on their store. The support team is absolutely amazing and took the time to meet with me to resolve some issues with the app. The reason we gave it 4 stars is because there are still some issues depending on how you decide to block customers (there are multiple scenarios you can choose from). This isn't necessarily an issue with the merchant itself as there are some limitations with developing an app for Shopify. However, if you run into any issues we recommend contacting them for a one-on-one call before giving up. We highly recommend this app. There are not many options for this functionality (and honestly this may be the only one).

Strange Tails

Jun 19, 2024 on Shopify

10/10 recommend this app - very functional and amazing customer service! I had a very specific and niche use case, I emailed customer service and Andrea was not only very prompt to respond but even released an update to his app that would allow it to work for our use case. Thank you!

View all reviews

Cart Block: checkout validator

About Cart Block: checkout validator

Built by Shopify

Related Categories

Zotasell: AI Upsell & Bundles

Description

CartBlock validates or blocks any order, protects from bots and frauds using multiple conditions

Pros

Cons

Top Helpful Reviews

Vaonis

3BR Powersports

3BR Powersports

Springfield Leather Co

Seven Potions

LuxeWell Life

PlantsInTheCity

MicroAvionics

First Holistic

Strange Tails

Key Features

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