What the data says: Across 17 operator reviews of these restock-alert apps — 8 Back in Stock, 5 Stoq, 4 Notify! — 59% rated their app "Very Satisfied" and 100% still actively use it. This is one of the highest-ROI app categories on Shopify.

Short version: Back in Stock (Restock Alerts) for the proven revenue-driver, Stoq if you want alerts plus preorders in one cheap app, and Notify! if simplicity and responsive support top your list. Honestly, the bigger mistake is not running one at all — operators routinely say these pay for themselves many times over.

Back in Stock vs Stoq vs Notify! at a glance

Which back-in-stock app drives the most revenue?

Back in Stock — all 8 still use it, remarkable ROI.

It "pays for itself ten times over every month."

"Some brands see 20% of their revenue come from this app."

Operators also use restock-request data to decide what to remake — it doubles as demand forecasting. The complaint is polish: the UI is "simple, barebones." Full breakdown on our Back in Stock review page.

Is Stoq the best value back-in-stock app?

For value, yes — its edge is bundling alerts with preorders.

"Preorders and back in stock alerts for $10/month is perfect."

"Performs reliably without any glitches."

The honest gaps: onboarding "can be a little tricky," and editing shipping dates is "extremely time consuming." Full picture on our Stoq review page.

When is Notify! the right pick?

When you want a simple, reliable tool with support that shows up — 3 of 4 Very Satisfied.

Restock notifications "almost always directly lead to sales."

Reporting is "more useful than expected," support strong.

The limits: wanted clearer per-product organization, and premium pricing "higher than expected." Full detail on our Notify! review page.

So which restock alert app should you choose?

One rule that matters more than the app: the money is in what you do with the signups. Operators seeing 10x results notify waitlists promptly and use restock-request data to decide what to reorder. An app that quietly collects addresses you never act on is wasted spend.

Capturing demand feeds merchandising — our Shopify inventory apps guide covers the forecasting side.

Run a restock alert app? Your revenue numbers are worth money. This comparison came from operators sharing what these tools actually returned — several see double-digit revenue from them. Shopify app teams pay $50 to $500 per call to hear it firsthand, and you get early access to the tools you help shape. Get paid for the opinion you already have. Join as a brand →

Operator statistics and quotes are from verified app reviews collected inside the app store research network, July 2026. Sample sizes vary. App pricing and features change; confirm current details on the Shopify App Store before purchasing.