Back-in-stock notifications on Shopify
When a product sells out, the shoppers who wanted it don't vanish. They're waiting. A back-in-stock notification lets them leave their email and tells them the moment the product returns, so the sale comes back to you instead of a competitor.
Shopify doesn't do this on its own
Shopify has no built-in "notify me when back in stock" button. Merchants asking in the Shopify Community get the same answer each time: add an app, or have a developer build it into the theme.
What a good setup looks like
- A "Notify me" form where the Add to cart button would be, showing only on sold-out variants.
- Email only. No account needed, so guests can sign up too.
- One alert, sent the moment stock returns. Speed matters, because the first shoppers to hear get the stock.
- First come, first served. If you restock 10 units, the first 10 people who signed up should hear first.
- An optional follow-up a day later, but only for people who didn't click or buy.
Don't over-promise
If you restock 10 units and 200 people are waiting, emailing all 200 at once sends 190 of them to a sold-out page again. Notifying in batches, only as many people as there are units, keeps the experience fair.
How Nesvo handles it
Nesvo is a Shopify app with back-in-stock alerts built in, as one of its nine automated email campaigns.
- The form: a "Notify me when back in stock" block appears automatically near Add to cart when the selected variant is sold out. You turn it on once in your theme editor.
- The alert: the moment the variant comes back into stock, Nesvo emails waiting shoppers in signup order, only as many as there are units available.
- The next batch: after 24 hours, or whatever wait you choose, Nesvo checks your stock again and alerts the next people in line if units are left. It checks stock right before every email, so nobody hears about a product that's sold out again.
- The follow-up: an optional reminder for those who didn't click or buy. It's off by default, and when it's on it goes out before anyone new is alerted.
- Your best customers first, if you want: an option lets your top customers hear before everyone else.
Shoppers who sign up for a product only hear about that product. They aren't added to your marketing list unless they subscribe separately.