An out-of-stock product page is a page where a shopper with intent, who has already found you, leaves with nothing. This category converts that dead end into either a captured email or a captured order. Waitlists are the low-risk version — collect the address, notify on restock, and the recovered revenue is close to pure upside. Pre-orders are the higher-risk, higher-reward version: you take money before you can ship, which is a cash-flow advantage and a customer-service obligation.
8 apps compared · checked 23 August 2026
| App | Rating | Reviews | Pricing | Best for |
|---|---|---|---|---|
| Back In Stock, Notify Me: Kbite | 5.0 | 3,882 | Free plan available | Pure restock waitlists without pre-order complexity |
| Notify Me! Back in Stock Alert | 4.9 | 3,575 | Free plan available | Getting a wishlist alongside waitlists and pre-orders |
| Preorder, Back In Stock — STOQ | 5.0 | 3,523 | Free plan available | Stores that need waitlists and pre-orders from one app |
| Preorder Now Presale Timesact | 5.0 | 1,957 | Free plan available | Structured presale campaigns with deposits and clear ship dates |
| PreOrder Globo | Back in Stock | 4.9 | 1,840 | Free plan available | Merchants already running other Globo apps |
| Preorder, Back In Stock REZ | 5.0 | 1,426 | Free plan available | A straightforward combined waitlist and pre-order app |
| Essent Preorder Back in Stock | 5.0 | 1,208 | Free plan available | Stores standardised on the Essential suite |
| Preorder, Back in stock Duck | 5.0 | 477 | Free plan available | Markets where WhatsApp restock alerts outperform email |
Feature lists all look the same. These are the five things that change the outcome once the app is installed.
Sign-ups must attach to the specific variant. A shopper who wants size M notified when size XS restocks is a complaint, not a recovered sale.
Email at minimum, SMS and push for hyped drops. The alert must fire within minutes of the inventory change, and the link must deep-link to the right variant.
For pre-orders, check support for deposits or split payments, plus clear expected-ship-date messaging on the product page, in the cart and in the confirmation email.
Pre-orders must be tagged so fulfilment does not treat them as normal orders and so mixed carts of in-stock and pre-order items are handled deliberately.
The waitlist is a free purchase-intent dataset. Good apps surface it as a restock priority list you can hand to purchasing.
Ordered by our picks first, then by merchant reviews. Short on time: Back In Stock, Notify Me: Kbite is the safest default.
Back in stock alert & restock alert for out-of-stock waitlists
Waitlist, preorder, wishlist and low stock — all in one app
Grow sales with preorders, 'notify me' & back in stock alerts
Use pre order now with back in stock waitlist & restock alerts
Drive sales with pre-order and restock alert
Do pre order, notify me, back in stock alert, restock waitlist
Pre-order manager & presale with back in stock alert waitlist
Create presales, backorders & 'notify me' restock waitlists
The context an app listing will never give you — what these widgets cost in page weight, and where the free tiers stop.
We install, measure and write up one widget category a month. Page-weight numbers included.