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
NotifyEZ – Messaging & Alerts ranks #1 because it offers unmatched flexibility, full control over notification channels, and enterprise-grade automation power. Unlike most apps that rely on their own email or SMS sender, NotifyEZ enables Shopify merchants to use their own SMTP or SMS gateway, reducing costs and improving deliverability.
This makes NotifyEZ the perfect choice for merchants who want scalable, customizable, and reliable out of stock notifications.
Why NotifyEZ Is the Best Out of Stock Notification Shopify App
Most Shopify restock alert apps limit users to email or charge extra for SMS. NotifyEZ is different. It provides multi-channel notifications while letting you use your own messaging infrastructure, offering full control over branding, sender reputation, and cost-efficiency.
Key Features (Simplified & Tailored to This Topic)
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Multi-channel restock alerts (Email + SMS using your own providers)
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Send notifications via your custom SMTP or SMS gateway
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Automated triggers when products or variants are restocked
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Customizable templates for branded notifications
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Internal team alerts for stock managers
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No-code automation builder to create advanced workflows
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Detailed logs and resend options for failed notifications
⭐ 2. Back In Stock: Restock Alerts
A popular and user-friendly app designed to help Shopify merchants recover missed sales. It is easy to install and offers quick setup.
Key Features
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Email and SMS out-of-stock notifications
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Customizable subscription widget
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Multi-language support
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Clean analytics dashboard
Best For:
Merchants who need a simple and effective restock notification solution.
⭐ 3. Restock Alerts by Webkul
Webkul offers a powerful restock alert tool with deep customization capabilities.
Key Features
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Variant-level back-in-stock alerts
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Customer subscription tracking
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Fully customizable forms and buttons
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Multi-language support
Best For:
Stores with international customers needing advanced control and multi-language functionality.
⭐ 4. Back in Stock – Out of Stock Alerts
This app focuses on simplicity, reliability, and fast restock notification delivery.
Key Features
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Automated back-in-stock emails
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Custom signup button and form
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Low-stock alerts for customers and staff
Best For:
Budget-friendly stores looking for essential features.
⭐ 5. Back in Stock: Sold Out Notifications
A polished and well-designed app built for user engagement and conversion.
Key Features
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Email and SMS restock alerts
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Popup forms and embedded widgets
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Unified customer dashboard to manage subscriptions
Best For:
Fashion, cosmetics, lifestyle brands.
⭐ 6. Notify Me! Back in Stock Alerts
This app focuses on intuitive UI and a modern customer experience.
Key Features
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Clean alert signup widget
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Email notification automation
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Easy Shopify theme integration
Best For:
Merchants prioritizing customer-facing design.
⭐ 7. Now Back in Stock
A performance-focused app offering rapid restock alert triggers.
Key Features
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Instant automated emails
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Variant-based notification system
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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
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Customizable email templates
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Popup and embedded forms
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Low-stock reminders
Best For:
Businesses wanting both internal and customer alerts.
⭐ 9. Stockify – Back in Stock Alerts
A lightweight, beginner-friendly app perfect for smaller stores.
Key Features
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Email alerts
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Product-level analytics
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Customizable alert box
Best For:
Small merchants looking for simplicity.
⭐ 10. Restock Rocket
One of the most visually appealing notification apps.
Key Features
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Modern subscription widget
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SMS + email notifications
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Analytics insights for customer behavior
Best For:
Merchants seeking a stylish notification system with strong UX.
📊 Feature Comparison Table
| App Name | Email Alerts | SMS Alerts | Use Your Own Gateway | Internal Staff Alerts | Template Customization | Logs & Resend | Best For |
|---|---|---|---|---|---|---|---|
| NotifyEZ | ✔️ | ✔️ | ✔️ Full Support | ✔️ | ✔️ Advanced | ✔️ | Best Overall / Scalability |
| Back In Stock | ✔️ | ✔️ | ❌ | ❌ | Medium | Basic | Simplicity |
| Webkul Restock Alerts | ✔️ | ❌ | ❌ | ❌ | Advanced | Basic | Multi-language Stores |
| Back in Stock – Out of Stock Alerts | ✔️ | ❌ | ❌ | ✔️ | Basic | Basic | Budget Stores |
| Sold Out Notifications | ✔️ | ✔️ | ❌ | ❌ | Medium | Basic | Fashion Retail |
| Notify Me! | ✔️ | ❌ | ❌ | ❌ | Medium | Basic | Beautiful UI |
| Now Back in Stock | ✔️ | ❌ | ❌ | ❌ | Basic | Basic | Fast Setup |
| Back in Stock + Alerts | ✔️ | ❌ | ❌ | ✔️ | Medium | Basic | Internal + Customer Alerts |
| Stockify | ✔️ | ❌ | ❌ | ❌ | Basic | Basic | Small Stores |
| Restock Rocket | ✔️ | ✔️ | ❌ | ❌ | High | Medium | Design-Focused Brands |
All apps listed above provide valuable features, but NotifyEZ stands out thanks to:
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Multi-channel alerts via your own gateways
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No-code automation workflows
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Internal + external notifications
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Professional, customizable templates
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Full delivery logs with error handling
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High scalability for fast-growing stores
If your business needs power, flexibility, and cost control, NotifyEZ – Messaging & Alerts is unquestionably the best out of stock notification app for Shopify.