Running an online store means dealing with products that occasionally go out of stock. However, when customers find an item unavailable, many of them simply leave the store and may never return. This is where a back in stock app Shopify solution becomes extremely valuable for store owners.

A back-in-stock app allows customers to sign up for restock notifications and receive alerts via email, SMS, or push notifications when a product becomes available again. This not only improves the customer experience but also helps merchants recover lost sales and increase conversion rates.

In this article, we will explore 10 of the best back in stock apps for Shopify that can help you automatically notify customers when products are restocked and turn product demand into real sales.

Top 10 back-in-stock apps for Shopify in 2026

🥇 1. Back in stock Restock Alert ZA

Overview

Stop losing revenue when your bestsellers run out. This back in stock app for Shopify allows you to turn “Sold Out” buttons into opportunities by letting customers subscribe to restock alerts. Whether it’s a specific product or a unique variant, the app ensures your shoppers are the first to know when items return, helping you recapture lost interest and boost your store’s conversion rate effortlessly.

Key Features

• Automated Restock Alerts: Send instant email notifications (manual or automatic) as soon as products or specific variants are back in stock.

• Fully Customizable Design: Easily modify the “Notify Me” button text, font colors, and backgrounds to blend seamlessly with your brand’s aesthetic.

• Seamless Integration: Works out-of-the-box with almost all Shopify themes and allows button placement on both product and collection pages.

• Marketing List Growth: Automatically sync new subscribers to your Shopify customer list for future email marketing campaigns.

• No Coding Required: Enjoy a “plug-and-play” experience with a quick installation process that requires zero technical skills.

• Dedicated Support: Access fast, reliable assistance whenever you need it via live chat or email.

Best For

• Shopify Merchants: Looking for a reliable back in stock app to minimize bounce rates on sold-out items.

• High-Volume Stores: Managing frequent inventory turnover and complex product variants.

• Growing Brands: Wanting to build an email marketing list while providing a better customer experience.

Get the Shopify app here.

🥈 2. NotifyEZ – Messaging & Alerts

Overview

NotifyEZ is a robust back in stock app for Shopify designed to help merchants manage inventory alerts and internal staff notifications with precision and scale. In the fast-paced world of eCommerce, delayed communication regarding stock levels can lead to missed revenue and operational friction. NotifyEZ eliminates these gaps by centralizing critical alerts—such as low stock and restock updates—delivering them instantly via email and SMS through custom SMTP and SMS gateways.

Key Features

• Comprehensive Stock Alerts: Automatically notify customers and staff about low stock, out-of-stock, and back in stock status to ensure no sales opportunity is missed.

• Instant Staff Notifications: Keep your team aligned with real-time updates on key store events, including new orders and inventory changes.

• Multi-Channel SMS Alerts: Send automated text notifications via supported gateways for high-priority updates that require immediate attention.

• Custom SMTP Emailing: Utilize your own SMTP settings to send reliable, professional email notifications directly from your store’s domain.

• Fully Customizable Templates: Easily tailor the content and branding of your email messages to match your store’s unique identity.

Best For

• Shopify Merchants: Seeking a high-performance back in stock app to automate customer re-engagement.

• Growing Operations: Businesses that need to bridge the communication gap between inventory changes and staff action.

• Brand-Conscious Stores: Owners who want full control over their messaging via custom SMTP and SMS branding.

Get the Shopify app here.

🥉 3. Appikon ‑ Back In Stock

Overview

Never let a “Sold Out” button be the end of a customer’s journey. Appikon’s back in stock app for Shopify empowers merchants to create automated waitlists and recover potentially lost revenue with ease. By allowing shoppers to sign up for instant restock alerts, you can significantly enhance the customer experience while automating your inventory communication. With built-in demand forecasting, this app helps you turn out-of-stock items into your next big sales opportunity.

Key Features

• Automated Restock Notifications: Send instant back in stock alerts and back-order reminders via both email and SMS the moment inventory is updated.

• Rapid, Code-Free Setup: Get your restock alert system up and running in less than 2 minutes—no technical skills or coding required.

• Fully Customizable Design: Tailor your signup forms and notifications to be 100% on-brand; fully compatible with all Shopify themes.

• Actionable Demand Analytics: Use detailed reporting to understand which products are most requested, helping you make smarter restocking decisions.

• Waitlist Management: Automatically generate waitlists for popular items to ensure you capture every bit of future purchase intent.

Best For

• Shopify Store Owners: Looking for a “set-and-forget” back in stock app to recapture lost sales and automate customer re-engagement.

• Data-Driven Merchants: Who want to use customer waitlists to gauge demand for new or existing product lines.

• Fast-Growing Brands: That need a highly customizable and mobile-responsive solution for restock notifications.

Get the Shopify app here.

4. Back In Stock: Alertes Clients

Overview

Maximize your revenue by sending instant push notifications, emails, and SMS alerts when your products return to inventory. This back in stock app for Shopify makes it easy for customers to subscribe to restock alerts for the items they love. With a simple setup process, the app offers multilingual and geographical support, extensive customization, and smart reminders for previously out-of-stock products, ensuring your customers are always the first to know when it’s time to buy.

Key Features

• Multi-Channel Notifications: Send automated back in stock alerts via push notifications, email, or SMS to reach customers wherever they are.

• Fully Customizable Design: Tailor your email themes and buttons to match your brand, or even create your own custom “Notify Me” button.

• Marketing Integrations: Connect seamlessly with your existing email marketing tools to personalize customer communication and build your mailing list.

• Global Readiness: Built-in support for multiple languages and locations to serve your international customer base effectively.

• Smart Reminders: Automatically follow up with customers about products that were previously out of stock to ensure they don’t miss out.

Best For

• International Shopify Merchants: Who need a back in stock app that supports multiple languages and global regions.

• Omnichannel Brands: Looking to engage customers across various platforms including push notifications, SMS, and email.

• Design-Focused Stores: Those who want full control over the visual appearance of their restock alert buttons and templates.

Get the Shopify app here.

5. Swym Back in Stock Alerts

Overview

Maximize your revenue by sending instant push notifications, emails, and SMS alerts when your products return to inventory. This back in stock app for Shopify makes it easy for customers to subscribe to restock alerts for the items they love. With a simple setup process, the app offers multilingual and geographical support, extensive customization, and smart reminders for previously out-of-stock products, ensuring your customers are always the first to know when it’s time to buy.

Key Features

• Multi-Channel Notifications: Send automated back in stock alerts via push notifications, email, or SMS to reach customers wherever they are.

• Fully Customizable Design: Tailor your email themes and buttons to match your brand, or even create your own custom “Notify Me” button.

• Marketing Integrations: Connect seamlessly with your existing email marketing tools to personalize customer communication and build your mailing list.

• Global Readiness: Built-in support for multiple languages and locations to serve your international customer base effectively.

• Smart Reminders: Automatically follow up with customers about products that were previously out of stock to ensure they don’t miss out.

Best For

• International Shopify Merchants: Who need a back in stock app that supports multiple languages and global regions.

• Omnichannel Brands: Looking to engage customers across various platforms including push notifications, SMS, and email.

• Design-Focused Stores: Those who want full control over the visual appearance of their restock alert buttons and templates.

Get the Shopify app here.

6. Restock Rocket

Best for: Visual customization and analytics.

Features:

• Branded signup forms

• Instant restock notifications

• Custom design tools

• Detailed conversion tracking

Pricing:
Free plan; paid from $9.99/month

Verdict:
Best for brands focused on maintaining consistent visual identity.

Get the Shopify app here.

7. Alert Me! Restock Alerts

Overview

Boost your revenue by instantly re-engaging customers when their favorite products return to your store. This back in stock app for Shopify automates the entire notification process, allowing shoppers to sign up for unlimited alerts via simple forms on your product and collection pages. Once you restock, the app triggers real-time notifications automatically, turning “Out of Stock” disappointments into successful sales without any manual effort.

Key Features

• Hands-Free Automation: Trigger restock alerts without any manual work—simply set it and forget it!

• Real-Time Notifications: Send back in stock alerts instantly the moment inventory is updated to capture immediate purchase intent.

• Unlimited Signups: Allow customers to subscribe to as many product or collection alerts as they want.

• Fully Customizable: Easily adjust the colors and design of your notification forms to perfectly match your brand’s aesthetic.

• Insightful Analytics: View your most-requested out-of-stock products to help you make data-driven inventory and restocking decisions.

• Dedicated Support: Get quick assistance from a team that loves to help you grow and set up your first alerts.

Best For

• Busy Shopify Merchants: Who want a “set-and-forget” back in stock app that handles notifications entirely in the background.

• Inventory Planners: Store owners who need clear data on which out-of-stock items have the highest customer demand.

• Customer-Centric Brands: Those looking to provide a seamless, real-time restocking experience for their loyal shoppers.

Get the Shopify app here.

8. Channelwill Back in Stock

Best for: Stores wanting built-in analytics and customer behavior tracking.

Features:

• Email + SMS alerts

• Custom templates

• Inventory sync with real-time updates

• Subscriber insights

Pricing:
Free plan available; paid from $12/month

Verdict:
A well-rounded app for Shopify sellers who value data insights.

Get the Shopify app here.

9. Klaviyo: E‑mail et SMS

Overview

Scale your business with the ultimate B2C CRM and marketing automation suite. Klaviyo leverages advanced AI to synchronize your Shopify data in real-time, capturing every customer interaction as it happens. By consolidating data from over 350 integrations, Klaviyo allows you to accelerate performance through sophisticated segmentation and AI-managed flows. Trusted by over 117,000 brands, it serves as a premier back in stock app for Shopify, transforming window shoppers into loyal buyers through highly personalized email, SMS, and AI-driven customer service.

Key Features

• Real-Time Data Integration: Harness live data from Shopify and 350+ third-party apps to power your marketing decisions.

• AI Marketing Agent: Let the AI Agent analyze your storefront to build and launch ready-to-use campaigns automatically.

• Advanced Segmentation & Triggers: Use AI and deep data insights to create precise customer segments and automated flow triggers, including back in stock alerts.

• Omnichannel Conversions: Drive sales across multiple channels including Email, SMS, WhatsApp, Push Notifications, and personalized Pop-ups.

• AI Customer Hub: Transform standard customer service interactions into revenue-generating purchase opportunities.

Best For

• High-Growth Shopify Merchants: Who need a comprehensive back in stock app integrated into a full-scale marketing ecosystem.

• Data-Driven Brands: Looking to leverage AI to automate complex customer journeys and personalized messaging.

• Omnichannel Retailers: Businesses wanting to sync their customer communication across email, text, and social messaging in one place.

Get the Shopify app here.

10. Back in Stock| PreOrder:Notify

Overview

Never miss a sales opportunity again! NotifyPro is a comprehensive back in stock app for Shopify designed to recapture lost revenue by alerting customers the moment products return to your inventory. Beyond simple restock alerts, the app allows you to accept preorders, display low-stock warnings, and send personalized interest-based notifications. With multi-channel delivery via email, SMS, and push notifications, NotifyPro helps you bring customers back to your store and track every conversion through detailed performance analytics.

Key Features

• Multi-Channel Restock Alerts: Automatically notify customers when products are back in stock via Push, SMS, and Email.

• Global Preorder Support: Seamlessly display “Preorder” buttons on product, collection, and home pages to capture early demand.

• Urgency-Driven Low Stock Alerts: Boost conversion rates by displaying low-stock warnings that encourage customers to buy before items sell out.

• AI-Powered Interest Alerts: Send targeted notifications based on a customer’s specific browsing history and product interests.

• Fully Customizable Notifications: Tailor the look and feel of your Email, SMS, and Push alerts to align perfectly with your brand identity.

Best For

• Dynamic Shopify Merchants: Who need a versatile back in stock app that also handles preorders and low-stock urgency.

• Data-Driven Store Owners: Those looking to use AI and analytics to personalize the customer shopping experience.

• High-Volume Retailers: Brands that want to engage customers across multiple communication channels (SMS, Push, and Email) simultaneously.

Comparison Table: Best Back-in-Stock & Alert Apps for Shopify (2026)