If customers can’t see the “Notify me when available” button on out-of-stock products, there are a few things to check.
1. Check That the Widget Is Added to Your Theme
The most common reason the button doesn’t appear is that the product widget hasn’t been added to your theme.
In the app, go to Settings and look at the installation status.
If it shows Not installed, click the link to open your Shopify theme editor on a product template.
Add the Restock Alerts product widget block where you want it (under the Add to Cart button works well).
Click Save in the theme editor.
2. Check the Product Is Actually Out of Stock
The button only appears when a product variant has zero inventory and your store is set to stop selling when out of stock.
In Shopify, go to the product and check the inventory for the variant in question.
Make sure “Continue selling when out of stock” is not ticked — if it is, Shopify keeps showing the Add to Cart button and the restock button won’t appear.
3. Check You’re Looking at the Right Theme
If you have multiple themes, make sure the widget was added to the theme that’s currently published (live) to your store.
In Shopify, go to Online Store → Themes.
The published theme has a green Current theme badge. Make sure the widget block is on that theme’s product template.
4. Try a Hard Refresh
If you just made changes, your browser may be showing a cached version of the page. Try opening the product page in a private/incognito window or pressing Ctrl+Shift+R (Cmd+Shift+R on Mac) to force a refresh.
5. Test With a Specific Variant
If your product has multiple variants (sizes, colours, etc.), only the variants that are out of stock will show the button. Make sure you’re selecting a variant that has no inventory.