The challenge
When a product sells out, most stores show a greyed-out "Sold Out" button. The shopper leaves, often to a competitor, and the merchant never knows how many sales they lost or which products were in demand.
Merchants needed a simple way to:
- Keep interested shoppers engaged when a product is unavailable
- Automatically bring them back the moment stock returns
- Understand real demand so they can reorder the right products
Our approach
We built Back In Stock! Alert Engine as an all-in-one tool for recovering sales lost to stockouts.
The button appears automatically on out-of-stock products and can be styled to match any brand. Merchants on higher plans can also show it on collection pages.
When inventory is updated, subscribers receive an email automatically. Merchants can also send alerts manually or in batches.
Low-stock and price-drop alerts create urgency and bring back price-sensitive shoppers.
Out-of-stock and price-drop waitlists show merchants exactly which products customers are waiting for, helping them plan inventory.
Subscribers can sync to Klaviyo and Omnisend, so every alert signup also grows the merchant's email list. Emails can be sent from the store's own domain, in multiple languages, with multi-location inventory support.
Email open, delivery, and read logs show merchants exactly how their alerts perform.
Results
- 4.9★ rating on the Shopify App Store, with 95% of reviews at five stars
- Merchants across the UK, UAE, India, and more using the app
Inside the app
What merchants say
Real reviews from the Shopify App Store:
“Excellent app and customer support. They even fixed an issue caused by another app dev team. Amazing.”
“The app is easy to setup and the support team is very responsive and helpful.”
“Such a great app! Meera was a huge help from start to finish. She responded super quickly and was really friendly throughout the whole conversation, which made the process easy and stress-free. We needed a few adjustments made, and she walked us through everything clearly and got it all sorted without any hassle. The support was genuinely top notch — responsive, patient, and focused on actually solving our problem rather than giving canned answers. It's reassuring to know that help is there and handled so well when you need it. Easy to recommend for anyone who values fast, reliable, and friendly support.”
What this project shows about our work
This app demonstrates our experience with real-time inventory webhooks, transactional email delivery at scale, third-party marketing integrations, and multi-language, multi-location Shopify stores. These are the same capabilities we use when building custom automation and integrations for clients.
Need a custom Shopify integration or automation?
The team behind Back In Stock! Alert Engine can build it.
Book a free strategy call