StockFair limits, enforced at checkout.
StockLock caps how much each customer can buy, per order and across orders, so limited stock reaches more of your real customers. Every checkout respects it, express checkouts included.
Set it once. Shoppers see it. Checkout enforces it.
Set your limits
Open any product in your Shopify admin and use the StockLock card, or set several at once in the app. Max, min, pack sizes, per-customer caps and who may buy.
Shoppers see them
Switch on the app embed in one click. Quantity boxes stop at the limit, a note explains it in your words, and the cart says what to change if it goes over.
Checkout enforces them
A checkout rule runs on Shopify's own servers for every checkout, including Shop Pay, Apple Pay and Google Pay. Cart links and express buttons go through it too.
Everything you need for limited stock
One plan, every feature. No add-ons.
Per-order limits
Maximum and minimum per order, and pack sizes such as "sold in tens", per product.
Per-customer limits
Cap how many one customer can buy across all their orders, not just in one cart.
Collection limits
Cap the total from a collection, such as "four items from this release per order".
Members-only and blocked customers
Restrict products to tagged customers with your own message, block customers from ordering, and exempt tags such as wholesale.
Invite-only drops
Choose who's eligible by spend, orders, tags or past purchases. Invite at random or by rank, then open to everyone by hand or on a schedule.
Orders held when a limit is broken
If an order slips past a limit, StockLock tags it and holds it before it ships, so you decide what happens.
Protect launches, keep customers happy
- Limited releases go further, across more of your customers
- Bulk buyers and resellers can't clear a drop in one checkout
- Rules are clear before checkout, so fewer frustrated shoppers
- Your wording everywhere: product pages, cart and checkout
- Works with Online Store 2.0 themes, no theme code edits
- Limits keep working at checkout even if our servers are busy
Built inside Shopify
The limits themselves run on Shopify: a checkout rule, admin cards on your products and an app embed in your theme. StockLock's own servers only handle what needs memory over time, such as per-customer counts, holds and drop schedules.
Your customers' data stays in your Shopify store. How we handle data.
Selling out to scalpers?
See how StockLock's limits work against bulk carts, repeat orders and express-checkout bots.
Try it free for 7 days
All features from day one. Cancel any time from your Shopify admin.