Stockouts are simply not just lost sales, they are lost data on exactly which products your customers want most, and a good back-in-stock app turns that lost demand into a recovered sale automatically. I run Ecommerce Paradise, a site built for store owners who want a real business, not just a side hustle. There, I teach high-ticket dropshipping, and I ranked the five back-in-stock apps below after comparing real pricing, feature depth, and App Store track records.
Here are the best back-in-stock apps for Shopify in 2026, ranked by feature depth, pricing structure, and real merchant reviews.
| Rank | App | Entry Price | Rating |
|---|---|---|---|
| 1 | Notify Me! | Free / $9.90/mo | 4.9/5 (3,500+ reviews) |
| 2 | PushOwl | Free / $19/mo | 4.8/5 (1,700+ reviews) |
| 3 | Klaviyo | Free / $20/mo | 4.6/5 |
| 4 | Omnisend | Free / $16/mo | 4.6/5 |
| 5 | Firepush | Free / $9.99/mo | 4.5/5 |
Want the deep dive on the top pick? Read my complete Notify Me! review →
Notify Me! tops this list because it is purpose-built for exactly this job, holding a 4.9 out of 5 rating across more than 3,500 Shopify App Store reviews while also covering preorders and wishlists, which none of the other four apps on this list match in one bundle.
1. Notify Me! (Best Overall)
Notify Me! ranks first because it does one job, capturing demand on sold-out products, better than any general-purpose alternative on this list. Beyond the core back-in-stock alert, it adds preorder functionality with partial deposit collection, low stock counters, wishlist tools, and support for email, SMS, and WhatsApp as notification channels. Pricing starts free and moves to $9.90 a month, billed by notification volume rather than subscriber count.
Choose Notify Me! if back-in-stock and preorder revenue is a real, measurable part of your sales strategy, especially if you are still validating a high-ticket niche and need every signal you can get on which sold-out products to prioritize restocking.
2. PushOwl (Best for Cart Recovery Plus Restock Alerts)
PushOwl, now operating as Brevo PushOwl, pairs web push notifications with abandoned cart recovery and back-in-stock alerts in one app. Pricing runs free to start, then $19 a month for the Plus Bundle, with unlimited subscribers on paid plans, a genuine advantage for a store building a large push list.
Choose PushOwl if cart recovery and general push-based re-engagement matter as much as restock alerts, since it covers meaningfully more ground than a dedicated back-in-stock app in exchange for somewhat shallower back-in-stock configuration specifically.
3. Klaviyo (Best If You Already Run Klaviyo for Email)
Klaviyo includes a native back-in-stock flow trigger inside its broader email and SMS marketing platform. Stores already paying for Klaviyo can add restock alerts without a separate subscription, though building the flow takes more manual configuration than a dedicated app’s out-of-the-box widget. Pricing is based on contact count, starting free and scaling from roughly $20 a month.
Choose Klaviyo if consolidating every customer communication channel into one platform matters more than having the deepest possible back-in-stock feature set.
4. Omnisend (Best All-in-One Marketing Platform)
Omnisend bundles email, SMS, and push notifications with back-in-stock automation available as part of its workflow builder. Pricing starts free and moves to roughly $16 a month, scaling by contact count similar to Klaviyo.
Choose Omnisend if you want one reasonably priced platform covering most of your marketing automation needs, with back-in-stock as one workflow among several rather than the app’s primary focus.
5. Firepush (Best Budget Option)
Firepush combines push, SMS, and email at a lower entry price than most competitors, starting free and moving to $9.99 a month, priced by subscriber count. It covers core back-in-stock and cart recovery use cases without the deeper preorder and wishlist tooling higher-ranked apps on this list include.
Choose Firepush if budget is the primary constraint and you need basic restock alerts without paying for features you will not use yet.
How I Ranked These Apps
I weighted four factors: how purpose-built the back-in-stock feature is versus a bolt-on inside a broader platform, pricing structure and entry cost, notification channel breadth, and independent App Store review volume and rating. Notify Me! wins the top spot specifically because it scores well across all four rather than excelling at one while lagging on the others.
Apps ranked lower are not weak products. PushOwl, Klaviyo, and Omnisend are all well-reviewed, widely used tools, they simply treat back-in-stock as a secondary feature rather than their core purpose, which shows up in configuration depth and reporting specificity once you dig into the details.
Pricing Models Explained
The single biggest structural difference across this list is whether an app charges by notification volume or by subscriber and contact count. Notify Me! and Firepush both use volume or subscriber-based models that stay predictable for a store with a small, loyal, repeat-buying audience. Klaviyo and Omnisend charge by total contact count, which climbs as your broader marketing list grows regardless of how much of that growth is tied to restock engagement specifically. PushOwl sits in between, charging a flat rate with unlimited subscribers on paid tiers.
A store with a highly engaged niche audience typically saves money on volume-based pricing. A store planning to scale its overall contact list aggressively for reasons unrelated to restock alerts may find a flat-rate or subscriber-unlimited model like PushOwl’s works out cheaper over time.
Feature Comparison at a Glance
Notify Me! is the only app on this list offering preorder deposits and dedicated wishlist tools alongside back-in-stock alerts. PushOwl adds abandoned cart recovery and price-drop alerts that Notify Me! does not attempt to cover. Klaviyo and Omnisend both offer the deepest overall marketing analytics, since reporting is a core strength of full marketing platforms rather than a single-purpose app. Firepush keeps the feature set intentionally lean to hit its lower price point.
No single app on this list wins every category. The right choice depends on whether back-in-stock is your primary revenue lever or one feature among several you need from your marketing stack.
Notification Channel Support Compared
Notify Me! stands out for supporting email, SMS, and WhatsApp in one app, a real advantage for stores selling into markets where WhatsApp is a primary communication channel. PushOwl and Firepush both lean on push notifications as their core channel with SMS layered in. Klaviyo and Omnisend cover email and SMS deeply through their broader platforms but do not offer native WhatsApp support for back-in-stock alerts specifically.
For a store selling internationally, particularly into Latin America, the Middle East, or South Asia, WhatsApp channel support can meaningfully affect actual notification open rates compared to email alone.
Installation and Setup Time
Notify Me!, PushOwl, and Firepush all install directly from the Shopify App Store and have a working back-in-stock widget live within minutes, since the feature is either the core product or a first-class citizen in all three. Klaviyo and Omnisend take longer to configure fully, since you are building a back-in-stock flow inside a much larger platform rather than flipping a dedicated toggle.
If you need restock alerts live today with minimal setup, the three dedicated or near-dedicated apps have a real speed advantage over the two full marketing platforms.
What Independent Reviews Say
According to Prediko’s roundup of Shopify back-in-stock apps, Notify Me! ranks among the stronger dedicated options specifically for combining alerts with preorder flows and discounting, while budget tools like Firepush trade feature depth for a lower entry price. Rankbase’s ranking of Shopify restock alert apps places several of these apps in its top ten, using the Built for Shopify badge and review volume as signals of real-world usage depth versus newer, less-tested entrants.
Both independent sources broadly agree with the ranking order here, dedicated back-in-stock tools tend to outperform bolt-on features inside broader marketing platforms on this specific use case, even when the broader platform is excellent overall.
Mobile Experience and Theme Compatibility
All five apps render correctly on standard Shopify themes without custom development work, though highly customized themes occasionally need minor CSS adjustments to get widget placement looking right on mobile screens. Notify Me! and Firepush, being the more lightweight, single-purpose apps, tend to have marginally faster page load impact than the fuller marketing platforms, a small but real factor for mobile conversion given how much Shopify traffic arrives on phones.
Test any app on a staging theme or a low-traffic period before rolling it out storewide, since widget placement bugs are far easier to catch and fix before your peak traffic hours than during them.
Pay attention to how each app handles variant-level stock as well, since a product with multiple sizes or colors needs the widget to track availability per variant rather than treating the whole listing as either in stock or sold out. All five apps on this list support variant-level tracking, but the depth of customization around variant-specific messaging differs meaningfully, and it is worth testing on a product with several variants before rolling the app out across your full catalog and product range.
Free Plan Limitations to Know About
Every app on this list offers a free tier, but the limitations differ meaningfully. Notify Me! and Firepush cap free usage by notification volume, which works fine for a low-traffic store but requires upgrading once demand grows. Klaviyo and Omnisend cap free usage by contact count, which can force an upgrade even for a store with modest restock-alert activity if its broader email list is large. PushOwl’s free tier is more limited in customization options than its paid Plus Bundle, though it remains genuinely usable for a small store just getting started.
Read the specific free-tier caps on each app’s current Shopify App Store listing before committing, since exact limits change periodically and the numbers here reflect general structure rather than caps that never move or update.
Refund and Trial Policies
Most apps on this list offer some combination of a free trial period or a money-back guarantee on paid plans, though the specifics vary and change over time. Check the current policy on each app’s Shopify App Store listing before subscribing, since app-store billing terms are set by the developer and can differ from general marketing claims made elsewhere.
Because Shopify handles billing centrally for App Store subscriptions, canceling any of these five apps is straightforward from your Shopify admin regardless of which one you choose, which lowers the real risk of testing more than one before committing long term to a single vendor.
Which App Should You Actually Choose
Start with Notify Me! if back-in-stock, preorder, and wishlist functionality is a genuine priority and you want the most purpose-built tool at the lowest entry price on this list. Choose PushOwl if cart recovery matters as much as restock alerts. Choose Klaviyo or Omnisend if you are already running one of those platforms for email and want back-in-stock bundled in rather than paying for a fifth app. Choose Firepush only if budget is the deciding factor and your feature needs are genuinely basic.
Whichever you pick, factor the subscription into your business formation and financial planning as a real recurring cost, since even the priciest option here is small relative to a single recovered high-ticket sale.
Pair whichever tool you choose with a reliable process for finding suppliers who can actually restock in a reasonable timeframe. No notification app fixes a supplier who cannot deliver on a popular product.
Not ready to build the sales process yourself? My done-for-you store build service sets up the right tooling and workflow from day one. If you want guidance structuring your own setup, my one-on-one coaching covers exactly how to build a demand-capture stack around a real high-ticket sales process.
Common Mistakes When Choosing a Back-in-Stock App
The most common mistake is picking based on price alone without checking whether the app’s pricing model actually fits your store’s growth pattern. A store with a small, highly engaged repeat-buyer audience that signs up for a contact-based pricing app like Klaviyo or Omnisend purely for back-in-stock can end up paying for list growth that has nothing to do with restock engagement. Match the pricing model to how your specific audience behaves, not just the sticker price on the landing page.
A second common mistake is installing an app, configuring the default widget settings, and never revisiting them. Notification copy, widget placement, and which products trigger alerts all benefit from periodic review as your catalog and traffic patterns change. An app configured once at launch and never touched again slowly drifts out of alignment with what actually converts on your specific storefront.
A third mistake is running more than one overlapping back-in-stock tool at once, which usually creates duplicate notifications and confuses customers rather than doubling your recovery rate. Pick one primary tool for this job and give it a real chance to prove itself with clean, uncontaminated data before considering a switch or an addition to your existing stack.
How Much Revenue a Back-in-Stock App Can Actually Recover
The realistic upside varies enormously by store, but the underlying logic is consistent: every shopper who signs up for a restock alert has already demonstrated purchase intent for a specific product, which makes that notification list meaningfully warmer than a cold ad audience or even a general email list. A stockout on a popular product that generates dozens or hundreds of alert signups represents real, quantifiable demand sitting in a queue waiting for the restock notification to go out, and that queue is worth treating as a genuine sales pipeline rather than a passive list.
Stores that treat back-in-stock alerts as a core part of inventory and marketing strategy, rather than an afterthought bolted onto checkout, tend to see the clearest return, since they use the signup data to prioritize which products to restock first rather than just sending a generic notification once inventory happens to arrive.
Frequently Asked Questions
What is the best back-in-stock app for Shopify overall?
Notify Me! ranks first for most stores because it is purpose-built for back-in-stock, preorder, and wishlist functionality at a lower entry price than the alternatives on this list.
What is the best free back-in-stock app?
Notify Me!, Firepush, and PushOwl all offer genuinely functional free plans, with the right choice depending on your specific notification volume and feature needs.
Should I use Klaviyo’s back-in-stock feature instead of a dedicated app?
If you already pay for Klaviyo for email marketing, yes, since the feature is effectively bundled in. If not, a dedicated app is usually cheaper and faster to configure.
Can I switch back-in-stock apps without losing subscriber data?
Export your existing notification request list before canceling any of these apps, since most support CSV export, though the exact process varies by app.
Do any of these apps support preorders?
Notify Me! is the strongest option specifically for preorders with partial deposit collection, a feature the other four apps on this list do not match in depth.
Or grab my free beginner’s guide to see how a tool like this fits into building a real high-ticket ecommerce operation from the ground up.
Trevor Fenner is an ecommerce entrepreneur and the founder of Ecommerce Paradise, a platform focused on helping entrepreneurs build and scale profitable high-ticket ecommerce and dropshipping businesses. With over a decade of hands-on experience, Trevor specializes in high-ticket dropshipping strategy, niche and product selection, supplier recruiting and onboarding, Google & Bing Shopping ads, ecommerce SEO, and systems-driven automation and scaling. Through Ecommerce Paradise, he provides free education via in-depth guides like How to Start High-Ticket Dropshipping, advanced training through the High-Ticket Dropshipping Masterclass, and fully done-for-you turnkey ecommerce services for entrepreneurs who want a faster, more hands-off path to growth. Trevor is known for emphasizing sustainable, real-world ecommerce models over hype-driven tactics, helping store owners build scalable, sellable, and location-independent brands.
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