Best Back in Stock Apps for Shopify (2026): What Actually Works

Back-in-stock apps handle one specific job: a product goes out of stock, a customer clicks a "Notify Me" button, and the app automatically sends them an alert the moment you restock. The customer doesn't place an order yet — they sign up, wait, and come back to buy when the item is available again. If you want to keep selling during the stockout rather than notifying customers afterwards, our backorder apps guide covers that instead.

That's why choosing the right back-in-stock app for Shopify is essential. In this post, we've handpicked the 11 best Shopify back-in-stock apps to ensure your notifications reach customers at the right time.

Note: Previously, we discussed the importance of back-in-stock alerts for Shopify stores and how they help you recover lost sales, keep customers engaged, and maximise revenue. But here's the thing, alerts are only effective when sent on time. If customers don't hear from you the moment a product is restocked, they might not return. If you're new to restock notifications, start with our back-in-stock alerts guide.

Features to look for in a Shopify back-in-stock app

Not all back-in-stock apps perform the same. The right app will capture every signup, send alerts at exactly the right moment, and bring shoppers back before they find a competitor. Here are the features to prioritise:

1. Fast notification speed: The app should send alerts the moment you restock, not hours later. Customers who signed up are ready to buy, every hour of delay gives them time to find the product elsewhere. Check reviews for mentions of notification timing and whether alerts fire immediately after restocking.
2. Multi-variant support: Customers should be able to subscribe to a specific variant - the size, colour, or style they actually want, not just the product. An app that only tracks signups at the product level will notify customers even when their specific variant is still out of stock. That erodes trust and drives unsubscribes.
3. Widget placement options: The "Notify Me" button should work across product pages, collection pages, and the homepage, not just on individual product listings. The more places a customer can sign up, the more demand you capture. Look for apps that let you place the widget without developer work.
4. Waitlist analytics: You should be able to see how many customers are waiting for each product or variant before you restock. This helps you prioritise which items to reorder and how much stock to bring in. An app with no demand visibility leaves restocking decisions to guesswork.
5. Batch sending controls: Restocking a popular item and notifying your entire waitlist at once can sell you out again before most customers see the alert. Look for apps that let you stagger notifications in batches, notifying a portion of the waitlist first to gauge sell-through before releasing the rest.
6. Email platform integration: If you already use Klaviyo, Mailchimp, or Omnisend, your back-in-stock app should sync waitlist data with your existing flows. This keeps customer data in one place and lets you personalise alerts using segments and tags you've already built.
7. Customisation options: The "Notify Me" button and email templates should match your store's branding. Look for control over fonts, colours, messaging, and button placement. Confirm the app sends alerts reliably first, customisation matters after the fundamentals are working.
8. Multi-channel alerts: Email is the baseline. SMS and web push notifications can improve reach for customers who prefer them. If a significant share of your customers are mobile-first, SMS is worth prioritising.
9. Shopify markets support: For stores selling across multiple markets, localised alerts feel more personal and reduce unsubscribes. If you're focused on one market, this is less critical, but worth checking if international growth is on your roadmap.

The right back-in-stock app earns its place by capturing every signup and delivering every alert without you having to check whether it worked. With that being said, let's take a look at the best Shopify back-in-stock apps in 2026.

Best Shopify back in stock alerts apps

Here are some of the best Shopify back in stock apps that we are seeing stores use:

1. STOQ

STOQ is the best back-in-stock app for Shopify in this list, built around one core promise: customers who sign up for a restock notification actually hear from you the moment the item is available again. The app adds a customisable "Notify Me" button to out-of-stock products, manages the waitlist automatically, and sends instant alerts via email, SMS, or push when you restock. With multi-language support and 24/7 human assistance, STOQ keeps the experience smooth for both store owners and shoppers.

Key Features:

• Customisable "Notify Me" button that works on product pages, collection pages, search result pages, custom pages and the homepage.
• Instant back-in-stock alerts via email and SMS the moment you restock.
• Multi-variant support so customers subscribe to the specific size or colour they want
• Waitlist analytics showing how many customers are waiting per product and variant
• Engagement analytics to show you the full customer journey from click to signups
• Batch sending controls to stagger notifications and prevent immediate sell-out
• Shopify markets support for stores selling across multiple markets
• 24/7 human support from a team that understands ecommerce workflows

STOQ also supports preorders and backorders for merchants who want to keep selling during new launces or stockout.

STOQ offers a free plan, with paid options starting at $10/month.

2. Appikon

Appikon is a well-known back-in-stock app that helps Shopify store owners turn sold-out products into future sales. Its waitlist functionality allows shoppers to subscribe for alerts, and once stock is replenished, instant notifications are sent via email, SMS, or push. The app also provides detailed reporting tools, offering insights into customer demand for both new and existing products, helping merchants optimize inventory and increase sales.

Key Features:

• Automated back-in-stock alerts via multiple channels.
• Waitlist functionality to capture lost sales.
• Customisable signup forms and emails to match branding.
• Advanced analytics for demand forecasting.
• Integrations with Klaviyo, Mailchimp, and Facebook Messenger.

Appikon offers a free plan, with paid options starting at $19.99/month.

3. AMP

AMP is a powerful back-in-stock solution for Shopify merchants looking to capture lost sales and re-engage customers. Unlike other apps, it replaces frustrating “out of stock” messages with customisable restock notification buttons, ensuring shoppers can easily subscribe for alerts. Designed to handle high SKU volumes, AMP offers detailed analytics, helping merchants track demand and optimise inventory planning.

Key Features:

• Instant back-in-stock notifications via email, SMS, and push.
• Customisable signup forms and restock buttons to match store branding.
• Tracks customer demand trends for inventory planning.
• Works with high SKU stores and supports multi-device compatibility.
• Supports multi-language alerts for global reach.
• Integrates with Klaviyo, Mailchimp, and Shopify Flow.

AMP is free to install, with paid plans starting at $19/month.

4. PushOwl

PushOwl, powered by Brevo, is a multi-channel marketing suite that includes back-in-stock notifications alongside email, SMS, and web push alerts. The app allows customers to subscribe for restock notifications through push notifications, ensuring they receive instant updates without relying solely on email. With automation tools, segmentation, and smart pop-ups, it helps merchants recover lost sales and drive customer retention.

To decide between notification channels, refer to our Email vs. SMS alerts comparison.

Key Features:

• Web push notifications for instant back-in-stock alerts.
• Automated email & SMS reminders for restocked items.
• Customisable signup pop-ups to capture lost sales.
• Advanced segmentation for personalized notifications.
• Integrates with Shopify Flow, Klaviyo, and Brevo for streamlined automation.

PushOwl offers a free plan, with paid options starting at $19/month.

5. Alert Me

Alert Me is a straightforward and efficient back-in-stock app that helps Shopify merchants automate restock notifications without manual effort. Customers can subscribe to unlimited alerts using simple sign-up forms on product and collection pages. When an item is restocked, the app instantly triggers email and SMS notifications, bringing shoppers back effortlessly. Its Customisable themes and built-in analytics help stores track demand and maximise sales.

Key Features:

• Automatic back-in-stock alerts via email.
• Unlimited customer sign-ups for restock notifications.
• Real-time notifications to increase conversions.
• Customisable email themes to match your store’s branding.
• Analytics dashboard to track product demand.

Alert Me offers a free plan, with paid options starting at $4.99/month.

6. Swym

Swym is the perfect back-in-stock app for D2C brands willing to invest in advanced features and integrations. It not only notifies customers when products are restocked via email and SMS but also re-engages them through social media. With its AI-powered recommendations, Swym helps drive customer interest even before items are available again.

Key Features:

• Automated restock notifications via email and SMS.
• Preorder and coming soon alerts to capture early demand.
• AI-driven product recommendations for out-of-stock items.
• Send alerts in a batch to control customer outreach.
• Integration with Klaviyo, Omnisend, and Mailchimp.

Swym offers a free plan, with paid options starting at $19.99/month.

7. ES Back in Stock Notify Me

ES Back in Stock Notify Me helps Shopify merchants win back lost sales with automated restock alerts via email and SMS. With a one-click setup, it automatically enables an “Email Me” button on product pages, allowing customers to subscribe for notifications when an item is available again. The app also offers customisable email templates to match your store’s branding and multi-language support to engage a global audience.

Key Features:

• Instant back-in-stock notifications via email and SMS.
• One-click setup with no coding required.
• Customisable email templates for branded alerts.
• Multi-language support for international reach.
• Integrates with Mailchimp and Klaviyo for seamless automation.

ES Back in Stock offers a free plan, with paid options starting at $5.99/month.

8. SC Back in Stock Restock Alert

SC is an effective back-in-stock Shopify app that helps Shopify merchants convert stockouts into sales opportunities. It offers batch notifications, allowing merchants to control how many customers are notified immediately, preventing inventory from selling out too quickly. Its multi-language support and deep integrations provide an improved experience for store owners and shoppers.

Key Features:

• Instant back-in-stock alerts via email, SMS, and push notifications.
• Customisable signup forms and notification designs for branding.
• Batch notifications to manage large restocks efficiently.
• Multi-language support to engage a wider audience.
• Integrates with Mailchimp, Klaviyo, and PushOwl for automation.

SC Back in Stock offers a free plan, with paid options starting at $10/month.

9. Notify Me!

Notify Me is a shopify app that helps Shopify merchants to reconnect with customers when products are restocked. The app allows store owners to add a “Notify Me” or “PreOrder” button, along with low-stock FOMO widgets, to out-of-stock product, home, and collection pages to create urgency and drive conversions. It supports B2B and B2C orders, helping merchants to offer discounts, notes, and partial preorder payments.

Key Features:

• Collects customer contact info even when items are unavailable.\
• Automated back-in-stock alerts via email, SMS, and push.
• Preorder and backorder support with partial payment options.
• Low-stock FOMO widgets to create urgency.
• Seamless integration with B2B and D2C workflows.
• Detailed sales reports for tracking lost revenue.

Notify Me offers a free plan, with paid options starting at $19.90/month.

10. Timesact

Timesact is a renowned back-in-stock Shopify app designed to re-engage customers with timely restock notifications. It stands out for its guided onboarding, making setup seamless for merchants. The app also offers complete inventory control, allowing store owners to turn preorders and restocks on or off based on stock levels. With automated alerts and preorder features, Timesact helps businesses maximise sales before replenishing inventory.

Key Features:

• Automates back-in-stock email alerts to waiting customers.
• Allows shoppers to sign up for restock notifications with a single click.
• Provides customisable signup forms and email templates.
• Preorder functionality to capture early sales.
• Inventory control to manage stock availability.
• Helps track demand for out-of-stock items to improve inventory planning.

Timesact offers a free plan, with paid options starting at $6.65/month.

11. PreOrder Globo

PreOrder Globo is a back-in-stock app that informs customers when sold-out products are restocked. Beyond just offering a “Notify Me” button, it enables preorders, presales, and backorders, allowing Shopify store owners to collect partial payments in advance. Merchants can also add custom delivery notes like “Delivery in 21-30 days” below the preorder button, helping manage customer expectations while securing sales before restocking.

Key Features:

• Sends automatic back-in-stock notifications via email.
• Preorder, presale, and backorder functionality with partial payments.
• Custom delivery notes for better order management.
• “Notify Me” button for easy customer signups.
• Seamless integration with Shopify themes and marketing tools.

PreOrder Globo offers a free plan, with paid options starting at $9.90/month.

Conclusion

Not all back-in-stock apps in this list are created equal. While many offer basic restock alerts, only a few get the details right — fast notification timing, variant-level accuracy, and reliable delivery every time you restock. Some lack proper analytics, others send alerts hours after you've already sold out again, and many fall short on integrations with the tools you're already using. That's where STOQ stands out. As a top-rated solution, it captures signups at every touchpoint, sends alerts the moment stock returns, and gives you the waitlist visibility to make smarter restocking decisions.

Install STOQ now and turn your back in stock alerts into sales!