The Best AI Back-in-Stock Alert Apps for Small Shopify Stores of 2026
We compared the six most-installed Shopify back-in-stock apps on published pricing, notification channels, preorder support, and demand analytics to find the ones actually worth installing on a small DTC store.
By Marcus Delacroix, Senior Tools Editor · Updated September 25, 2026 · 6 tools tested
The Verdict
For most small Shopify stores, STOQ (Preorder, Back In Stock) is the pick. It has the highest average rating in the category, a free plan that'll carry a founder-led store for months, and a Klaviyo sync that keeps your waitlist inside the ESP you already pay for. If you want back-in-stock, a wishlist, and preorders bundled together, Notify Me! is the better fit; it has a bigger review base and includes wishlist actions on the same plan. And if you're already running email, SMS, and push on Brevo PushOwl, keep it there. Its included back-in-stock automation is the cheapest way to add this channel to an existing retention stack.
Sold-out product pages are the quietest revenue leak on a small Shopify store. A shopper lands on an out-of-stock item with no way to say "notify me," and they're gone, usually to a competitor. A back-in-stock app is the smallest, cheapest fix for that leak, and in 2026 the good ones also feed your demand planning and your email list at the same time.
We didn't run these apps on a live store. Instead, we compared the six most-visible back-in-stock apps on the Shopify App Store against their own live pricing pages, help docs, and Shopify listings on September 25, 2026. Every price, plan name, channel (email/SMS/push/WhatsApp), and integration we cite is pulled from the vendor's own page, and every product we ranked has a link in the Sources block. Here's exactly how we compared them, and how each one stacked up.
How We Tested
We didn't run these apps on a live store. Every score below is from a documentation and pricing comparison against each vendor's own Shopify App Store listing, pricing page, and help center on September 25, 2026, cross-checked with the Shopify App Store review count and rating on the same day.
Published Pricing & Free Plan
We opened each app's live Shopify App Store listing and, where available, the vendor's own pricing page on September 25, 2026, and recorded every published tier (name, monthly price, included alert/action volume) and whether a free plan or free trial exists. Apps whose published pricing was clear, small-store-friendly, and included a usable free tier scored highest; apps that hid entry pricing or forced quick upgrades scored lower.
Notification Channels
We read each vendor's Shopify listing and help documentation and recorded which channels are supported for restock alerts out of the box: email, SMS, web push, WhatsApp, and Facebook Messenger. Apps supporting three or more channels natively scored highest; email-only apps scored lowest.
Preorder & Waitlist Depth
We checked each vendor's feature description for preorder/backorder support, variant-level waitlists, partial-payment or deposit collection, and preorder discounts. Apps that combined a real preorder engine with the back-in-stock button scored highest; apps offering only a Notify Me button scored lower.
Demand Analytics
We read the feature list on each vendor's own page for signup analytics, waitlist reports by product/variant, and recovered-revenue tracking. Apps that expose demand data granular enough to inform a reorder decision scored highest; apps that only track sends scored lower.
Marketing Stack Fit
We recorded which email/SMS platforms each app documents a native integration with (Klaviyo, Mailchimp, Attentive, Omnisend, Shopify Flow) and whether that integration is available on the entry paid tier. Apps that dropped waitlist events straight into Klaviyo or Shopify Flow on the cheapest paid plan scored highest.
Reviews & Track Record
On September 25, 2026, we recorded each app's Shopify App Store rating (out of 5) and review count, and noted whether it carries the Built for Shopify badge. Apps combining a 4.8+ rating, a review base in the thousands, and the Built for Shopify badge scored highest.
1
STOQ (Preorder, Back In Stock)
by Artos Software
Editor's Choice
9.2/10★★★★⯪
The highest-rated, most-reviewed back-in-stock app on the Shopify App Store, with a free plan that carries most small stores and a Klaviyo sync on the paid tiers.
Best for: Most small Shopify stores
Why We Like It
5.0 average across 3,724 reviews on the Shopify App Store, with the Built for Shopify badge
Free plan available, then Lite $10/mo, Standard $29/mo, Pro $69/mo, clearly published and small-store friendly
Klaviyo sync, multi-location, multi-language, and reminder alerts built in
Watch Out For
SMS notifications are billed per segment on top of the plan, which adds up on longer messages
The bundled preorder engine is powerful but adds a second widget to configure if you only wanted restock alerts
How It Scored
Published Pricing & Free Plan9.4
Notification Channels8.6
Preorder & Waitlist Depth9.4
Demand Analytics8.8
Marketing Stack Fit9.2
Reviews & Track Record9.8
2
Notify Me!
by AppHub
Best Value
8.9/10★★★★☆
The most-installed back-in-stock app on Shopify, and the one to pick if you want restock alerts, preorders, wishlists, and a low-stock counter in one bundle.
Best for: Stores that also want a wishlist and preorders
Why We Like It
4.9 average across roughly 3.8k reviews on the Shopify App Store, with the Built for Shopify badge
Multi-channel out of the box (email, SMS, and push) plus Klaviyo integration
Bundles back-in-stock, preorder, wishlist, and a 'only X left' low-stock counter in a single app
Watch Out For
Entry paid tier starts around $15.96 for the first month for 1,500 alerts, then scales, so it isn't the cheapest option once you outgrow the free plan
The combined menu of notify/preorder/wishlist/low-stock features is powerful but can feel busy on a first setup
How It Scored
Published Pricing & Free Plan8.4
Notification Channels9.2
Preorder & Waitlist Depth9.4
Demand Analytics8.6
Marketing Stack Fit8.8
Reviews & Track Record9.6
3
Amp Back in Stock & Preorder+
by HEL SG PTE LTD
Best for Beginners
8.6/10★★★★☆
A newer, cleanly designed back-in-stock and preorder app with a Built for Shopify badge and one of the widest install bases in the category. A solid, boring choice.
Best for: Founder-led stores that want a set-and-forget install
Why We Like It
Auto-notify via email, SMS, and push in one app, with configurable widgets for Notify Me, preorder, wishlist, and low-stock badges
4.9 rating across 945 reviews on the Shopify App Store; vendor cites 'hundreds of millions of alerts delivered across 25,000+ brands'
Free plan available, and the app is Built for Shopify certified
Watch Out For
Advertised as 'trusted since 2011' but the review base is smaller than STOQ's or Notify Me!'s, so there's less independent operator commentary to lean on
Pricing tiers aren't summarized on the App Store card; you have to click through to the plan chooser to see limits
How It Scored
Published Pricing & Free Plan8.4
Notification Channels8.8
Preorder & Waitlist Depth8.8
Demand Analytics8.4
Marketing Stack Fit8.2
Reviews & Track Record8.8
4
Swym Back in Stock Alerts (with Wishlist Plus)
by Swym
Stores that want the wishlist to be the retention layer
8.2/10★★★★☆
The wishlist-first option. Priced by 'wishlist actions' rather than alerts, with the deepest set of ESP integrations in the category if you can absorb the per-action model.
Best for: Stores that want the wishlist to be the retention layer
Why We Like It
Klaviyo, Attentive, and Tapcart integrations are available from the Pro plan up; Ometria, Braze, Iterable, Bloomreach, Bluecore, and others sit on Enterprise
Wishlist Plus is Built for Shopify and rated 4.7 with more than 1,400 reviews
Multi-platform: the same product runs on BigCommerce and Magento if you ever move off Shopify
Watch Out For
Pricing is action-based (Starter $19.99, Pro $59.99, Premium $99.99, scaled by monthly wishlist actions), which can spike unexpectedly
Shopify Plus merchants can no longer see the Free and Starter plans; the entry price rises for Plus stores
How It Scored
Published Pricing & Free Plan7.4
Notification Channels8.4
Preorder & Waitlist Depth7.8
Demand Analytics8.6
Marketing Stack Fit9.4
Reviews & Track Record8.8
5
Brevo PushOwl
by Brevo
Stores consolidating email, push, and SMS in one Shopify app
8.0/10★★★★☆
Not a pure back-in-stock app. It's a Shopify email/SMS/push suite that happens to include restock automation, and the cheapest way to add this channel if you're already shopping for a retention platform.
Best for: Stores consolidating email, push, and SMS in one Shopify app
Why We Like It
Back-in-stock is one of several included automations alongside abandoned cart, price drop, browse abandonment, welcome, and shipping
Free plan, Plus Bundle $19/mo, Power Bundle $79/mo, with unlimited subscribers on every paid plan
4.9 rating across roughly 1,250 Shopify App Store reviews and consumption-based pricing that doesn't punish list growth
Watch Out For
The back-in-stock experience is less deep than a dedicated tool. You configure it inside a broader marketing app, not a specialized widget
Preorder, wishlist, and low-stock counters aren't part of the app; if you need those, you'll pair it with a dedicated back-in-stock app anyway
How It Scored
Published Pricing & Free Plan9.0
Notification Channels9.2
Preorder & Waitlist Depth6.0
Demand Analytics7.6
Marketing Stack Fit8.6
Reviews & Track Record9.0
6
Appikon — Back In Stock
by Appikon Software
Stores that want the plainest possible restock alert install
7.8/10★★★⯪☆
One of the oldest and simplest back-in-stock apps on Shopify. Reliable, fast to install, but the feature set has moved past it in 2026.
Best for: Stores that want the plainest possible restock alert install
Why We Like It
Sets up in under two minutes with no code, notifies subscribers within 60 seconds of a restock per the vendor's own docs
Free plan available, with paid tiers starting at $19.99/mo
Sends alerts via email, SMS, Facebook Messenger, and web push, a rare four-channel install
Watch Out For
Advanced automation features sit behind higher-priced plans; SMS is billed on top
No native preorder engine or wishlist in the app itself, and demand analytics are lighter than STOQ's or Swym's
How It Scored
Published Pricing & Free Plan8.2
Notification Channels9.0
Preorder & Waitlist Depth6.6
Demand Analytics7.4
Marketing Stack Fit7.8
Reviews & Track Record8.4
What changed in 2026
Two things are worth calling out. First, the category has quietly consolidated around a smaller list of Built for Shopify apps with genuinely usable free plans. STOQ shows a 5.0 rating across 3,724 reviews with a free plan and free trial available, and Amp Back in Stock & Preorder+ carries a 4.9 across 945 reviews with a free plan available. Small stores no longer need to pay a monthly fee just to put a Notify Me button on a sold-out page.
Second, back-in-stock has stopped being a single-purpose feature. The best apps in 2026 also ship a preorder engine, a wishlist, and a low-stock counter, and they push waitlist events into your existing ESP. Wishlist Plus lets shoppers save favorites and return to them later, with APIs to customize wishlists and integrations with major email services for price-drop and restock alerts. STOQ, Notify Me!, and Amp all bundle preorders directly into the Notify Me flow. The result: your waitlist stops being a dead-end list and becomes a demand-forecasting and re-engagement tool at the same time.
Who each one is for
If you want one app that most Shopify stores will grow into rather than out of, install STOQ. It has the highest rating and largest review base in the category, and it publishes small-store-friendly tiers. If you’re building the rest of the retention stack around it, our ranking of AI shopping assistant chat widgets for small Shopify DTC stores covers the on-page widgets that catch out-of-stock shoppers before they bounce, and our heatmap and session recording ranking covers how to see which sold-out pages are actually costing you sessions.
If your store already loses sales to on-site friction (shoppers hitting a sold-out variant and bouncing before they scroll), pair a back-in-stock app with an on-page assistant. The chat-widget ranking above covers widgets that surface substitutes when a product is out of stock and can catch buyers before they leave.
And if you’re already running Brevo PushOwl for email or push, don’t install a second app just for restock alerts. The Basic plan is aimed at startups getting started with web push notifications, and all email and SMS marketing features are available even on Basic; the Plus plan adds advanced automation like Abandoned Cart Recovery, and the Power plan adds Browse Abandonment, Subscriber Segmentation, and Flash Sale tools. Turn on the built-in back-in-stock automation, keep your retention stack in one place, and buy a dedicated app only if you outgrow it.
One note on total cost: every app on this list bills SMS on top of its base plan, and that pricing is charged per message segment. If most of your customers are US mobile shoppers and you plan to send restock alerts by text, model out 60-80% of your subscribers converting at $0.02-$0.05 per SMS before assuming the cheapest monthly plan is really the cheapest.
Frequently Asked Questions
What's the best back-in-stock app for a small Shopify store in 2026?
STOQ (Preorder, Back In Stock) by Artos Software took our top spot. It carries a 5.0 average across 3,724 Shopify App Store reviews and the Built for Shopify badge, publishes clear tiers (free plan, then Lite $10/mo, Standard $29/mo, Pro $69/mo), and syncs waitlist events into Klaviyo. If you also want a wishlist, preorders, and a low-stock counter in one app, Notify Me! is the better bundle.
Do I actually need a back-in-stock app if I already use Klaviyo?
It depends on your store. Klaviyo can send restock emails, but the customer-facing 'Notify Me' button on your product page has to come from somewhere, either a dedicated app like STOQ or Notify Me! (both of which sync into Klaviyo), or an all-in-one Shopify retention app like Brevo PushOwl. If Klaviyo is already your email of record, we'd install STOQ and let its Klaviyo sync do the sending, so the waitlist lives in the same tool as the rest of your flows.
Which back-in-stock app has the most generous free plan?
Two are worth trying. STOQ ships a free plan and clearly published paid tiers starting at $10/mo. Brevo PushOwl's free plan gives you unlimited web push subscribers and starts email and SMS automations at zero cost, useful if you want to consolidate retention channels rather than stack another single-purpose app.
Do these apps handle preorders too, or is that separate?
STOQ and Notify Me! both bundle preorders (partial payments, backorders, and discounted preorder offers) alongside the Notify Me button, at no extra cost. Amp Back in Stock & Preorder+ does the same. Swym is wishlist-first and doesn't run a preorder engine of its own. Brevo PushOwl and Appikon are alert tools, not preorder tools; if you need to actually take money on out-of-stock products, pick one of the first three.
Which app is best if I want SMS and WhatsApp restock alerts, not just email?
Notify Me! documents email, SMS, and push out of the box, and Brevo PushOwl bundles email, SMS, and web push in every plan with unlimited subscribers. Appikon uniquely lists Facebook Messenger alerts alongside email, SMS, and web push. On every one of these, SMS is billed as a usage fee on top of the plan, so factor per-message cost into your total.
