Inventory shortages are inevitable in eCommerce, but losing potential customers because a product goes out of stock doesn’t have to be. Every time a shopper sees the “Sold Out” badge, there’s a high chance they will leave your store and purchase elsewhere—unless you give them a way to subscribe for restock alerts.

That’s why out of stock notification Shopify apps are essential. These tools automatically notify customers when an unavailable item becomes available again, helping merchants recover lost sales, improve customer experience, and boost conversion rates. With the growing competition in online retail, having an effective restock alert system is no longer optional—it’s a must-have for every Shopify store.

10 Best Out of Stock Notification Shopify Apps

🔥 1. NotifyEZ – Messaging & Alerts 

Overview

NotifyEZ is a robust solution designed to help merchants manage inventory updates and internal communications with precision. In the fast-paced world of eCommerce, missing an out of stock notification on Shopify can lead to lost sales, operational errors, and a poor customer experience. NotifyEZ solves this by centralizing critical alerts and delivering them instantly via email and SMS. By utilizing custom SMTP and SMS gateways, the platform ensures that your inventory data remains clear, reliable, and scalable as your business grows.

Key Features

• Comprehensive Stock Alerts: Automatically send low-stock, out-of-stock, and back-in-stock alerts to both customers and staff.

• Real-Time Staff Updates: Keep your team informed with instant notifications for essential store events, such as new orders or sudden stock changes.

• Automated SMS Notifications: Use supported gateways to send high-priority text alerts, ensuring your team sees urgent updates immediately.

• Reliable SMTP Email Delivery: Configure custom SMTP settings to send branded, reliable messages that avoid the spam folder.

• Fully Customizable Templates: Easily tailor your email content and branding using flexible templates to maintain a professional look.

Best For

NotifyEZ is the ideal choice for Shopify merchants who need a more reliable and professional way to handle an out of stock notification on Shopify. It is best suited for growing businesses that require advanced customization for internal staff alerts and want to ensure that neither their team nor their customers ever miss a critical inventory update.

Get the Shopify app here.

⭐ 2. Back In Stock: Restock Alerts

Overview

Turn missed opportunities into revenue by alerting your customers the moment their favorite items return. This app is a powerful solution for managing out of stock notification Shopify workflows, allowing customers to sign up for alerts on specific products or variants. It integrates seamlessly with almost all Shopify themes and requires zero coding. By transforming “sold out” into a future sale, you can maintain customer interest and recover lost revenue with a simple, automated system.

Key Features

• Instant Subscription: Allow customers to easily subscribe to restock alerts directly on product or collection pages.

• Flexible Alert Delivery: Send automated or manual notifications the second a sold-out product or specific variant is back in inventory.

• Fully Customizable Design: Tailor the “Notify Me” button’s text, font, and colors, along with email templates, to perfectly match your brand’s aesthetic.

• Seamless List Syncing: Automatically sync your alert subscribers to your Shopify customer list, helping you grow your audience for future marketing.

• Rapid Installation & Support: Get up and running in minutes with a user-friendly interface and access to fast assistance via live chat or email.

Best For

This app is the best out of stock notification for Shopify merchants who want a high-impact, low-effort way to boost retention. It is ideal for stores with fluctuating inventory or popular product variants that sell out quickly and need a reliable way to bring eager buyers back to the checkout page.

Get the Shopify app here.

⭐ 3. Webkul Pre‑Order

Overview

Transform your inventory challenges into sales opportunities with the Pre-Order Controller App. Instead of a “Not Available” message, give your customers the chance to buy out-of-stock items or upcoming launches instantly. This tool acts as a powerful out of stock notification Shopify solution by bridging the gap between demand and delivery. Whether you are dealing with restocks, new product drops, or inventory delays, this app ensures your store keeps generating revenue 24/7, making sure you don’t miss a single sale.

Key Features

• Centralized Command Center: Administrators can manage all pre-order settings through a simple, user-friendly, and flexible dashboard.

• Instant Pre-Order Activation: Easily mark any product or variant for pre-order, allowing customers to commit to a purchase even when the item is currently unavailable.

• Automated Customer Updates: Send automatic emails when products are officially back in stock to keep your buyers informed and engaged.

• Flexible Payment Options: Boost buyer trust and early conversion rates by offering the choice between full payments or partial deposits.

• Demand Forecasting: Stay ahead of product demand by capturing sales before your inventory even arrives at the warehouse.

Best For

This app is the best out of stock notification for Shopify merchants who want to capture revenue upfront rather than just collecting emails. It is ideal for stores that experience frequent sell-outs, brands launching new collections, or businesses that want to maintain sales momentum during inventory delays.

Get the Shopify app here.

⭐ 4. Back In Stock: Alertes Clients

Overview

Never let a sell-out be the end of a customer’s journey. With the Back in Stock app, customers can easily subscribe to receive instant alerts the moment a product they want is replenished. To ensure your message is seen immediately, the platform offers a versatile mix of push notifications, emails, and SMS. Designed for global commerce, it features a simple setup process, multi-language and geographical support, and automated reminders for items that were previously unavailable.

Key Features

• Automated Multi-Channel Alerts: Send instant push notifications, emails, or SMS messages as soon as an item is back in inventory.

• Fully Customizable Branding: Tailor your email templates and themes to match your store, or design a custom “Notify Me” button from scratch.

• Advanced Marketing Integrations: Connect seamlessly with your existing email marketing tools to further personalize your customer communications.

• Global Readiness: Utilize multi-language support and location-based settings to serve customers effectively across different regions.

• Smart Reminders: Automatically follow up with customers regarding products that were previously an out of stock notification on Shopify, ensuring they don’t miss the restock.

Best For

This solution is the best out of stock notification for Shopify merchants who want a high-visibility, multi-channel approach to recovering sales. It is ideal for international stores that need multilingual support and want to leverage the high open rates of push notifications and SMS to bring customers back to their shop instantly.

Get the Shopify app here.

⭐ 5. Back in Stock: Sold Out Notifications

Overview

Maximize your revenue and recover potentially lost sales by keeping your customers informed about product availability. This solution provides a comprehensive suite of tools—including “Notify Me” buttons and automated restock alerts—sent via both email and SMS. By allowing shoppers to join waitlists for currently unavailable items, you can transform an out of stock notification on Shopify into a powerful re-engagement tool. Whether it’s price drop alerts or low-stock warnings, this app is designed to convert interested browsers into loyal, paying customers.

Key Features

• Automated Recovery Alerts: Instantly convert missed opportunities with automated “Back in Stock” and “Notify Me” notifications.

• Dual-Channel Reach: Send high-impact email and SMS alerts for low-stock warnings, out-of-stock events, and successful restocks.

• Demand Intelligence: Track both B2B and D2C demand to better understand your audience and optimize retargeting with personalized messaging.

• Real-Time Engagement: Use real-time alerts to trigger a sense of urgency (FOMO) and re-engage potential buyers the moment inventory arrives.

• Advanced Customization: Take full control with manual alert triggers, custom CSS for brand styling, notification filters, and automated resend options.

Best For

This app is the best out of stock notification for Shopify merchants who want a versatile, feature-rich toolkit to handle complex inventory scenarios. It is ideal for stores serving both wholesale (B2B) and retail (D2C) markets that need to leverage scarcity and urgency to drive rapid conversion upon restocking.

Get the Shopify app here.

⭐ 6. Back In Stock,Notify Me: Kbite

Overview

Krtbite is a comprehensive marketing tool designed to help Shopify merchants recover potentially lost revenue. By using an out of stock notification Shopify strategy, you ensure that customers never walk away from a sold-out product. The app automatically displays a “Notify Me!” button on unavailable items, allowing shoppers to join waitlists for restocks and price drops. With integrated email and SMS alerts, Krtbite keeps your audience engaged and ready to buy the moment your inventory returns or prices decrease.

Key Features

• Automated Restock Alerts: Instantly send automatic “Back in Stock” notifications via email and SMS as soon as items are replenished.

• Proactive Price Drop Alerts: Keep customers informed by sending alerts the moment a watched product goes on sale.

• Out of Stock Waitlist Analytics: Gain valuable insights into product demand with analytics that show which out-of-stock items are most wanted by your customers.

• Seamless List Growth: Automatically sync your waitlist subscribers to your main customer list to scale your email marketing efforts.

• Full Design Customization: Tailor the “Notify me when available” button and all notification templates to perfectly align with your brand’s look and feel.

Best For

Krtbite is the best out of stock notification for Shopify store owners who want to combine inventory alerts with broader marketing goals. It is ideal for merchants looking for an all-in-one tool to manage waitlists, track product demand, and grow their mailing list simultaneously.

Get the Shopify app here.

⭐ 7. Now Back in Stock

A performance-focused app offering rapid restock alert triggers.

Key Features

• Instant automated emails

• Variant-based notification system

• User-friendly setup

Best For:

Merchants wanting a no-frills, fast solution.

⭐ 8. Back in Stock + Restock Alerts

A flexible restock alert app with strong customization capability.

Key Features

• Customizable email templates

• Popup and embedded forms

• Low-stock reminders

Best For:

Businesses wanting both internal and customer alerts.

⭐ 9. Stockify Pre‑order Coming Soon

Overview

Never miss a sales opportunity again by leveraging pre-orders, pre-sales, and backorders. Stockify is designed to help merchants manage inventory effortlessly, allowing you to sell “coming soon” or currently unavailable items without a hitch. By transforming a standard out of stock notification on Shopify into an active pre-order opportunity, Stockify keeps your revenue flowing and your customers engaged even when physical stock is low. Whether you are navigating inventory delays or building hype for a new launch, this tool ensures your store stays open for business 24/7.

Key Features

• Versatile Pre-Order Displays: Easily enable pre-order options for both upcoming “coming soon” items and currently out-of-stock products.

• Smart Inventory Controls: Set up pre-orders with highly customizable timing, quantity limits, and countdown timers to create urgency.

• Flexible Payment Gateways: Offer customers the choice between full payments or partial deposits for pre-orders, seamlessly integrated with the Shopify checkout.

• Incentivized Pre-Sales: Boost conversions by offering specific discounts for customers who choose the pre-order or partial payment route.

• Customizable Design Presets: Freely design your pre-order interface with various styling options and presets to ensure a perfect match with your store’s theme.

Best For

Stockify is the best out of stock notification for Shopify merchants who want to capture immediate revenue from unavailable products rather than just sending a restock alert. It is ideal for brands that run frequent product launches, deal with high-demand items that sell out fast, or want to test market interest before stock arrives.

Get the Shopify app here.

⭐ 10. Restock Rocket

One of the most visually appealing notification apps.

Key Features

• Modern subscription widget

• SMS + email notifications

• Analytics insights for customer behavior

Best For:

Merchants seeking a stylish notification system with strong UX.

Get the Shopify app here.

📊 Feature Comparison Table