How to Set Up Back-in-Stock Alerts on Shopify

Every sold-out product on your store is a small leak. A shopper arrives ready to buy, finds the item unavailable, and leaves. Most never come back, and you never even know they were there. Back-in-stock alerts close that leak: instead of losing the visitor, you capture their interest and bring them back automatically when the product returns.

What back-in-stock alerts do

On a sold-out product page, shoppers see a short signup: something like "Email me when it's back." They enter their email and join a waitlist for that specific product or variant. When you add inventory again, every shopper waiting for that item gets an automatic email letting them know it's available, with a link straight back to the product.

The result is a recovered sale you would otherwise have lost, and a list of people who have told you exactly what they want to buy.

How to set them up

Shopify doesn't include back-in-stock alerts natively, so you add them with an app from the Shopify App Store. The setup is short:

• Install a back-in-stock app and open it once to confirm it's connected to your store.
• Add the app's signup block to your product page. On modern Shopify themes this is done in the theme editor (Online Store, then Themes, then Customize), where you open a product page and add the block to the product layout. No code editing required.
• That's it. The signup shows automatically on sold-out products and stays hidden on in-stock ones, so your in-stock pages look exactly as before.

What to look for in an app

Back-in-stock apps vary a lot. A few things worth checking before you commit:

• Pricing that won't surprise you. Some apps charge a percentage of recovered sales or meter you per email, so your bill climbs exactly when the feature is working. Flat monthly pricing is easier to predict.
• Proof of delivery. The whole feature depends on the email actually arriving. An app that logs every notification, who it went to and whether it was delivered, lets you verify it's working instead of hoping.
• No theme code injection. Apps that install through Shopify's theme app blocks add nothing to your theme's code and leave no residue if you uninstall.
• Your data stays yours. Look for free export of your waitlist, so you're never locked in.

Make the most of your waitlist

A waitlist is also a demand signal. If 80 people are waiting for one variant and 3 for another, you know exactly what to reorder and how much. Reviewing which products attract the most signups can guide your purchasing as well as recover individual sales.