BlockCart: Checkout Validator

Develop by Shopify

$4.99

/ Month

Free plan available

Prevent unwanted orders with customizable checkout validation rules and alerts.

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BlockCart: Checkout Validator screenshot

About BlockCart: Checkout Validator

Launched May 22, 2026

Built by Shopify

Address

151 O’Connor St, Ottawa, ON, ON, CA

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Description

Prevent unwanted orders with cart rules and multi-condition checkout validation.

Stop bad-fit orders before they become fulfillment headaches. Create checkout validation rules that block unwanted purchases by ZIP or postal code, shipping address, products, collections, product tags, SKU, quantities, cart total, customer tags, login status, country, company, discounts, and cart attributes. Combine multiple conditions for local delivery, product restrictions, order limits, B2B rules, and customer eligibility. Show a custom checkout error message when blocked.

Block or validate orders with multiple checkout rules.
Display warnings and messages on product pages, cart pages, and during checkout.
Import & Export to move rules between stores.