Turn out-of-stock pages into a waiting list that converts.

Customers subscribe to the exact size and colour they want, not just the product.
Waitlist volume by variant becomes a reorder quantity recommendation before you place the PO.
Release restock emails in waves so a limited run does not disappoint most of the list.
Push waitlist events into Klaviyo and run the messaging from the flows you already built.
Most back-in-stock apps collect an address and send a blast. That works until the restock is smaller than the list, at which point you have annoyed most of the people who signed up.
Restock Radar sends in waves sized to the inventory you actually received, oldest signup first, with a hold window before the next wave goes out.
Waitlist depth per variant is the cleanest demand signal a store gets — it is people telling you they want a specific SKU at a specific size. Restock Radar turns that into a reorder recommendation you can hand to your supplier.
Signup events sync to Klaviyo, so if you have already built your lifecycle flows you can run the messaging there and use Restock Radar purely for capture and forecasting.

Cart & CheckoutThe cart drawer that loads before your theme does
A fast, fully customisable slide-out cart drawer for Shopify, with a rewards progress bar, upsells, add-ons and discount codes built in. No theme code, and every feature on every plan.
MerchandisingLet customers build their own bundle and watch AOV climb.
A step-by-step bundle builder that lets shoppers assemble a routine or kit from your catalogue, with live pricing and automatic discount tiers.
PerformanceSee exactly which app is costing you conversions.
Continuous Core Web Vitals monitoring for Shopify that attributes every millisecond of load time to the app or script responsible.