When a shopper visits your store and discovers their favorite product is out of stock, they often leave and buy somewhere else. But with the right Shopify stock alert email app, you can turn this painful scenario into an opportunity—by letting customers subscribe to notifications and automatically emailing them the moment the product is back in stock.

Stock alert email apps help you recover lost sales, improve customer satisfaction, and optimize inventory management. With the growing competition in eCommerce, having a reliable, customizable, and fast stock alert system has become essential for every Shopify merchant.

In this comprehensive guide, we highlight the 12 best Shopify stock alert email apps, their features, pros, cons, and ideal use cases.
Sitting at the top of the list is NotifyEZ – Messaging & Alerts, a multi-channel notification system that stands out with its ability to use your own email or SMS gateways, offering unmatched flexibility and control.

12 Best Shopify Stock Alert Email Apps

🥇 1. NotifyEZ – Messaging & Alerts

NotifyEZ – Messaging & Alerts is the most flexible and powerful app for stock alert emails on Shopify. Unlike most restock apps that lock you into their own email or SMS service, NotifyEZ allows you to send notifications through your own SMTP server or SMS gateway. This gives merchants complete control over deliverability, branding, and messaging costs.

Why NotifyEZ is #1

NotifyEZ covers everything merchants expect from a stock alert app—but with deeper customization, automation, and a multi-channel messaging system. Whether you want to send back-in-stock emails, SMS alerts, or internal notifications to your staff, NotifyEZ handles it all through one unified, no-code platform.

Key Features (Summarized for This Topic)

• Email stock alert notifications using your own SMTP

• SMS stock alerts through your own SMS gateway

• Automated triggers when products or variants are restocked

• Fully customizable, branded email templates

• Internal staff alerts for inventory updates

• No-code workflow builder for advanced automation

• Detailed message logs + resend options for failed notifications

Best For:

Medium to large stores, global brands, and merchants wanting full control over email deliverability and messaging.

Get the Shopify app here.

🥈2. Back in Stock – Restock Alerts by Webkul

Webkul’s app offers robust customization and is suitable for multilingual and international stores.

Key Features

• Email restock notifications

• Supports variant-level subscriptions

• Multi-language support

• Customizable widgets and templates

Best For:

Stores selling globally and requiring deep personalization.

Get the Shopify app here.

🥉3. Back In Stock: Restock Alerts

A popular and widely used stock alert app with a clean user interface and reliable email system.

Key Features

• Automated stock email alerts

• SMS notifications available

• Customizable signup form

• Analytics and performance reports

Best For:

Merchants needing an easy and efficient restock notification solution.

Get the Shopify app here.

⭐ 4. Back in Stock – Out of Stock Alerts

A simple but powerful app designed for reliability and speed.

Key Features

• Automated back in stock emails

• Low-stock staff alerts

• Customizable subscription forms

Best For:

Stores needing a no-frills, budget-friendly notification system.

Get the Shopify app here.

⭐ 5. Back in Stock + Restock Alerts

A flexible and balanced restock notification app for Shopify.

Key Features

• Email stock alerts

• Variant-level tracking

• Customizable popup or embedded signup widget

Best For:

Merchants wanting both internal and customer-facing stock alerts.

⭐ 6. Notify Me! Back-in-Stock Email Alerts

A modern, lightweight app focused on delivering a clean customer experience.

Key Features

• Email notifications

• Easy installation

• Stylish signup widget

Best For:

Small to medium stores prioritizing UI/UX design.

Get the Shopify app here.

Get the Shopify app here.

⭐ 7. Restock Rocket

A visual-focused restock app ideal for D2C brands.

Key Features

• Email + SMS stock alerts

• Customizable forms and templates

• Strong analytics insights

Best For:

Brands needing beautiful, conversion-focused alert designs.

Get the Shopify app here.

⭐ 8. Now Back in Stock

The app specializes in fast-trigger emails and simplicity.

Key Features

• Quick stock email notifications

• Variant-specific notifications

• Simple dashboard

Best For:

Merchants wanting a minimal, easy-to-use restock alert app.

⭐ 9. Back in Stock – Restock Alerts by Appikon

Highly popular and trusted app with advanced notification settings.

Key Features

• Email + SMS alerts

• Signup popup and widget

• Strong customization options

Best For:

Stores wanting a comprehensive, widely supported alert system.

⭐ 10. Stockify – Back in Stock Notifications

A simple, reliable solution perfect for small Shopify merchants.

Key Features

• Email alerts

• Customizable forms

• Basic analytics

Best For:

Merchants on a budget.

Get the Shopify app here.

⭐ 11. CartBite – Back in Stock Alerts

A multipurpose app that includes stock alerts plus other customer engagement tools.

Key Features

• Email, SMS, and push notifications

• Product request forms

• Great customer support

Best For:

Stores seeking an all-in-one customer engagement solution.

Get the Shopify app here.

⭐ 12. Klaviyo

Not a standalone restock app, but a powerful email marketing platform with restock automation features.

Key Features

• Advanced stock email flows

• Segmentation + personalization

• Analytics and marketing automation

Best For:

Stores already using Klaviyo for email marketing.

📊 Comparison Table: 12 Best Shopify Stock Alert Email Apps