Min, max and multiples
that checkout cannot skip
Product, variant, collection and cart rules, plus customer-tag targeting on Pro. Friendly messages on the product and cart pages. Shopify re-checks every rule at checkout, including Shop Pay and Apple Pay.
Three steps
Install, turn on the embed, write a rule. Rules stay drafts until you turn them on.
Write a rule
Pick products, variants, a collection or the whole cart. Set a minimum, a maximum, a multiple, or a cart value. On Pro, limit the rule to tagged customers such as wholesale.
Turn it on
Save and turn on. The app writes a Cart and Checkout Validation Function. Shopify blocks checkout when the cart breaks the rule, including express checkout.
Show the message
Switch on the app embed. Shoppers see the min, max or multiple on the product page and a warning if they add the wrong quantity. The Function is still the guard.
What shoppers see
On the product page: “Buy at least 6, in multiples of 6.” In the cart: the same message if the quantity is wrong. At checkout: Shopify blocks the order until they fix it. Express buttons cannot skip the check.
Good to know
- Checkout is the guard. A theme script can be bypassed. The validation Function cannot: Shopify runs it on cart, checkout and express checkout.
- A product minimum applies once the product is in the cart. Shoppers who never add it are not blocked. Cart-level minimums apply to every cart.
- Cart value uses the subtotal before discounts. Gift cards are counted as cart lines like any other product unless you exclude them with a product rule.
- Customer tags need a logged-in customer. Guests have no tags. The app never stores customer records; tags are checked at checkout by Shopify.
What you get
Admin in English, Portuguese, Spanish, French, German or Italian. Three plans.
Product and variant rules
A minimum, a maximum and a multiple, added up across matching lines in the cart.
Collections and the cart
On Growth and Pro: collection totals, cart item count, and min/max order value.
Customer tags
On Pro: apply a rule only to wholesale, or only to everyone except wholesale.
Friendly storefront messages
Theme embed and optional blocks on product and cart pages. Same wording as checkout.
Enforced at checkout
A Cart and Checkout Validation Function. Shop Pay and Apple Pay cannot skip it.
Three plans
$7, $15 or $29 a month. 14-day trial. Change plans in Settings without reinstalling.
Three plans, billed by Shopify
$7
Starter · per month
- Product and variant quantity rules
- 15 live rules
- Theme messages in 6 languages
- Checkout validation
- Email support
$15
Growth · per month
- Everything in Starter
- Collection rules
- Cart quantity and order value
- Custom checkout messages
- 50 live rules
$29
Pro · per month
- Everything in Growth
- Customer-tag targeting
- 200 live rules
- Wholesale vs retail limits
- Email support
Questions
Do I need Shopify Plus?
No. Cart and Checkout Validation Functions work on every Shopify plan.
Can shoppers skip the limit with Shop Pay?
No. Shopify runs the validation on express checkout too. The theme message is only a courtesy.
What is a multiple?
The quantity must be 2, 4, 6… if you set 2. Combine it with a min and a max, for example min 6, max 24, multiple of 6.
How do customer tags work?
On Pro you type the tags (for example wholesale). The Function reads the logged-in customer’s tags at checkout. Guests have none. The app does not store customers.
Can I change plan without reinstalling?
Yes. Settings lists Starter, Growth and Pro. Shopify replaces the charge immediately.
Do I need a theme developer?
Usually no. Turn on the app embed. Adding the product-page or cart block is optional.
What happens when I cancel?
Cancel in Settings or uninstall. The validation is turned off. After an uninstall Shopify sends shop/redact and we delete the store’s rules.