Back in Stock vs Stoq vs Notify!: A Restock Alert Comparison (2026)

Short version: Back in Stock (Restock Alerts) if you want the proven revenue-driver and don't mind a basic interface, Stoq if you want restock alerts plus preorders in one cheap app, and Notify! if simplicity and responsive support top your list. Honestly, this is one of the highest-ROI app categories on Shopify, operators routinely say these tools pay for themselves many times over, so the bigger mistake is not running one at all.

That's from balanced data. We collect first-hand reviews inside app store research, 8 for Back in Stock, 5 for Stoq, 4 for Notify!. Here's what operators using them told us, including the standout theme: the return on these apps is unusually high.

Quick answers, if you're in a hurry

Do back-in-stock apps actually drive revenue? Yes, more than almost any app category in our data. Operators report one "pays for itself ten times over every month," another said "some brands see 20% of their revenue come from this app." Recovering demand on sold-out products is high-margin revenue you'd otherwise lose.

Which is the most proven? Back in Stock (Restock Alerts). All 8 operators still use it, and several credit it with years of consistent sales. The tradeoff is a basic UI.

Which is the best value? Stoq. One operator summed it up: preorders and back-in-stock alerts for $10 a month is "perfect." It bundles two jobs into one cheap app.

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

Back in Stock (Restock Alerts) is the proven revenue-driver, and the operator data is unusually strong on ROI, all 8 reviewers still use it, and the money quotes are remarkable. One owner said it "pays for itself ten times over every month." An operator noted "some brands see 20% of their revenue come from this app." Another called the ROI "very high against our other channels."

Beyond revenue, operators value the batch notifications (alerting waitlists as stock lands) and a genuinely useful side benefit, one owner uses restock-request data to decide what to remake, so it doubles as demand forecasting. For capturing lost demand on sold-out SKUs, it's the category benchmark.

The honest complaints are about polish, not performance. The UI is "simple, barebones", it works but isn't slick, and operators want more brand customization on the signup button and better-broken-down reporting. A couple flagged notification-trigger issues after a platform change, and one questioned whether $20/month was worth it for their volume. Verdict: the proven, high-ROI pick, if you can live with a plain interface. Full breakdown on our Back in Stock review page.

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

For value, yes, and its edge is bundling. Stoq combines back-in-stock alerts with preorders, so you cover two jobs in one subscription. Of 5 reviews, 3 rated it Very Satisfied and all 5 still use it.

Operators like the price-to-function ratio, "preorders and back in stock alerts for $10/month is perfect", and the reliability ("performs reliably without any glitches"). The preorder feature with per-product availability dates comes up as a genuine plus for stores managing incoming inventory. And support earns specific praise: "knowledgeable and super fast to respond."

The honest gaps: because it does more, onboarding "can be a little tricky" at first. Editing shipping dates is "extremely time consuming" without a search function, and a couple wanted richer customer-communication options. One flagged a questionable onboarding instruction to re-upload already-notified signups. Verdict: the best value if you want alerts and preorders together and don't mind a slightly steeper start. See the full picture on our Stoq review page.

When is Notify! the right pick?

When you want a simple, reliable alert tool with support that shows up. Notify!'s sample is smaller, 4 reviews, but consistent, 3 of 4 Very Satisfied, all still using it, and the theme is "does exactly what you expect without any issues."

Operators credit easy installation, reporting that's "more useful than expected," and, repeatedly, a strong support team. The core promise lands: one operator said restock notifications "almost always directly lead to sales." For a store that wants the job done cleanly without complexity, it's a dependable pick.

The honest limits: operators wanted clearer organization of requests by product rather than per-SKU, more email customization, and flagged that premium pricing runs "higher than expected." Nothing damning, just the edges of a focused, simpler tool. Verdict: a solid, well-supported choice when simplicity beats feature depth. Full detail on our Notify! review page.

So which restock alert app should you choose?

Match it to what you need alongside the core alert.

If you want the most proven revenue-driver and can accept a basic UI, install Back in Stock. If you want alerts and preorders bundled cheaply, Stoq is the value pick. If you want a simple, reliable tool with responsive support, Notify! delivers that. All three do the core job well, this is a category where the apps mostly work; the differentiators are price, preorder bundling, and interface polish.

One rule that matters more than the app: the money is in what you do with the signups. The operators seeing 10x and 20%-of-revenue results aren't just collecting emails, they're notifying waitlists promptly and using restock-request data to decide what to reorder or remake. A back-in-stock app that quietly collects addresses you never act on is wasted spend. Set up the batch notifications, watch the demand data, and let it inform buying, that's where the ROI actually comes from.

Capturing demand is one piece of retention and merchandising, our Shopify inventory apps guide covers the forecasting and stock side that back-in-stock demand data feeds into.

Run a restock alert app? Your revenue numbers are worth money. This comparison came from operators sharing what these tools actually returned, and 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 by app. App pricing and features change; confirm current details on the Shopify App Store before purchasing.