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Cart Block: checkout validator icon

Cart Block: checkout validator

Block or validate orders in product, cart and checkout page

by Nextools · Launched: February 2024 · Free plan available.

4.9 (16) on Shopify Built for Shopify
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CartBlock validates or blocks any order, protects from bots and frauds using multiple conditions

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About Cart Block: checkout validator

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 Show more Show less

Last verified: July 17, 2026 · Fresh

App details

Developer
Nextools
Pricing
Free plan available
Launched
February 2024
Rating
4.9 (16) on Shopify

Key features

  • Free for dev stores
  • Free for Shopify Plus sandbox stores
  • - All Free Plan included
  • - Unlimited Checkout Validation Rules
  • - Validate Shipping Address
Integrations with:

Checkout, Shopify Admin

4 plans · starts free · 7-day free trial

FREE DEV

Free

Premium Plan

$3.99/month

Advanced Plan

$5.99/month

Ultimate Plan

$7.99/month

Plans and prices as listed on the Shopify App Store.

Ratings & reviews

based on 23 Shopify App Store reviews

Use the arrows to read individual reviews

Andrea was incredibly helpful in getting the exact configuration we needed set up!
— Insect Shield
I had issues with Fraud and the team at Cart Block was able to create a custom work around in less then 24 hours! Highly recommend.
— SteelFit USA
Great Experience
— Olivia Shukria | Online Store
Great app, thanks Abhi for helping me!
— dariadéh
I had a great experience with Abhi who helped me set up a cart block validation!
— Tom & Teddy UK
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!
— Vaonis
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 thi...
— 3BR Powersports
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...
— Springfield Leather Co
Great quick and friendly staff!
— Patta Wholesale
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
— Seven Potions
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...
— LuxeWell Life
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.
— PlantsInTheCity
Free plan says "Free for dev stores" but I cannot add any validation rule without subscribing to a premium plan. Cannot properly test the app thus cannot install it on my client's store with confidence.
— Dev Basic Plan
Still lets orders come through
— SeaPaints
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 diff...
— MicroAvionics
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). Thi...
— First Holistic
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!
— Strange Tails
Dealing with bots abandoning checkout because they are attempting different credit card numbers. This app allows me to set up rules to block these bots from checking out. They will still try but their attempts will be futile, so if they come across and use a card number that works, it will be blocked. In time they have slowed down as I believe it sees my store as not being able to do what they wan...
— Camo Ever After
Support so far is exceptional. Let's hope this app works!
— Adley and Company
Excellent app! We had BOTS card testing on our webstore and tried a few other apps that just didn't work. As of today, the BOTS are gone! Cart Block was simple to use and set up. We had minor issue at the beginning found out we had to update our checkout for this to work properly. Andrea was extremely helpful and was able to hop on a call with me. Thanks again! Looking forward to see what other ap...
— Candy Warehouse

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