Inventory shortages are one of the biggest causes of lost sales in eCommerce. When customers discover that a product they want is out of stock, most will leave and search for the item elsewhere. But with a Shopify stock alert SMS app, you can instantly notify shoppers the moment the item is restocked — turning lost opportunities into easy conversions.
SMS is far more immediate and personal than email. With open rates exceeding 95% and average read time under 3 minutes, SMS restock alerts are one of the most effective ways to re-engage customers and drive repeat sales.
In this comprehensive guide, we review the 15 best Shopify stock alert SMS apps, including features, pros, cons, use cases, and a detailed comparison table at the end.
15 Best Shopify Stock Alert SMS Apps
🥇 1. NotifyEZ – Messaging & Alerts
NotifyEZ – Messaging & Alerts stands out as the most powerful and flexible Shopify stock alert SMS solution. Unlike most apps that require using their built-in SMS service, NotifyEZ lets merchants send stock alert SMS messages using their own SMS gateway, such as Twilio, Vonage, or any custom provider.
This gives you complete control over delivery quality, sender IDs, and cost optimization — making it ideal for stores with high SMS volumes or international audiences.
⭐ Why NotifyEZ Is #1
Most restock apps only send emails or require expensive SMS credits. NotifyEZ is the only one built for true flexibility, offering both email and SMS through your own gateways, fully customizable workflows, and internal staff alerts — all without writing any code.
For merchants who want enterprise-level control, NotifyEZ is in a league of its own.
Key Features (Simplified for Stock Alert SMS Use Case)
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Back-in-stock SMS alerts using your own SMS gateway
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Email alerts using your own SMTP
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Custom SMS templates with store branding
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No-code workflow triggering when a product or variant is restocked
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Internal alerts for staff when inventory levels change
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Detailed delivery logs with resend options
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Flexible automation scenarios for all notification types
🥈 2. Back In Stock: Restock Alerts
A widely used Shopify app for restock alerts, including SMS notifications.
Key Features
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Email + SMS restock alerts
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Customizable popup form
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Works with variants
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Basic analytics
Best For:
Quick setup and simple restock notifications.
🥉 3. Back in Stock – Restock Alerts by Appikon
Appikon’s restock notifications are popular for their reliability and ease of use.
Key Features
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SMS + email notifications
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Multi-language support
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Customizable signup widget
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Automated triggers
Best For:
Merchants wanting a proven, stable solution.
⭐ 4. Restock Rocket
Known for its clean UI and strong SMS delivery.
Key Features
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SMS and email stock alerts
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Fully customizable alerts
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Detailed analytics
Best For:
D2C brands with high design and UI standards.
⭐ 5. Now Back in Stock
A simple app focused on fast replacements and quick SMS alerts.
Key Features
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Variant-level SMS alerts
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Automated restock notifications
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Easy setup
Best For:
Merchants needing speed and simplicity.
⭐ 6. Stockify – Back in Stock Alerts
A lightweight, budget-friendly SMS and email alert tool.
Key Features
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SMS + email notifications
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Simple interface
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Product and variant tracking
Best For:
Small stores needing a low-cost solution.
⭐ 7. CartBite – Restock & Price Drop Alerts
A multifunction app that includes SMS restock alerts.
Key Features
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SMS, email, and push notifications
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Prebuilt templates
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Excellent customer support
Best For:
Stores wanting an all-in-one engagement suite.
⭐ 8. Klaviyo SMS (Restock Workflow)
Klaviyo isn’t a dedicated stock alert app, but its SMS automations are powerful.
Key Features
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SMS flow builder
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Dynamic restock triggers
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Segmentation & personalization
Best For:
Brands already using Klaviyo for marketing.
⭐ 9. SMSBump (Yotpo SMS)
Another marketing tool that includes restock flows.
Key Features
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SMS automation
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Back-in-stock triggers
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Strong subscriber list tools
Best For:
SMS-heavy stores using Yotpo’s ecosystem.
⭐ 10. Back in Stock – Restock Alerts by Webkul
A customizable tool ideal for international stores.
Key Features
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SMS optional integrations
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Customizable forms
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Multi-language support
Best For:
Multi-region merchants.
Get the Shopify app here.
⭐ 11. Notify Me! Back-in-Stock Alerts
A clean, modern app for email + SMS alerts.
Key Features
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SMS and email notifications
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Elegant UI
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Analytics dashboard
Best For:
Merchants focused on front-end design.
⭐ 12. Out of Stock Police + Alerts
Combines inventory management with restock alerts.
Key Features
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SMS or email notifications
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Inventory sorting
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Variant-level monitoring
Best For:
Stores with large catalogs needing cleanup tools.
⭐ 13. Back in Stock — Smart Restock Alerts
An intelligent alert system with flexible notifications.
Key Features
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SMS + email
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Custom triggers
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Popup subscription forms
Best For:
Merchants wanting personalized alerts.
⭐ 14. Restockly – Back In Stock Alerts
A newer solution with strong UI and user experience.
Key Features
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SMS notifications
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Customizable templates
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Embedded signup widget
Best For:
Modern D2C ecommerce stores.
15. Swym Back in Stock Alerts
Swym’s solution is optimized for large brands with high traffic.
Key Features
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SMS and email restock alerts
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Consumer behavior tracking
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Seamless Shopify integration
Best For:
Enterprise-level Shopify stores.
📊 Feature Comparison Table: 15 Best Shopify Stock Alert SMS Apps
| App Name | SMS Stock Alerts | Email Alerts | Use Your Own SMS Gateway | Automation Workflow | Internal Staff Alerts | Template Customization | Best For |
|---|---|---|---|---|---|---|---|
| NotifyEZ | ✔️ | ✔️ | ✔️ Full Support | Advanced | ✔️ | Advanced | Best Overall |
| Back In Stock | ✔️ | ✔️ | ❌ | Medium | ❌ | Medium | Simple Restock Alerts |
| Appikon Restock | ✔️ | ✔️ | ❌ | Medium | ❌ | Medium | Popular & Reliable |
| Restock Rocket | ✔️ | ✔️ | ❌ | Medium | ❌ | High | UI-Focused Stores |
| Now Back in Stock | ✔️ | ❌ | ❌ | Basic | ❌ | Basic | Speed & Simplicity |
| Stockify | ✔️ | ✔️ | ❌ | Basic | ❌ | Basic | Budget Stores |
| CartBite | ✔️ | ✔️ | ❌ | Medium | ❌ | Medium | All-in-One Apps |
| Klaviyo | ✔️ | ✔️ | ❌ | Advanced | ❌ | Advanced | Marketing-Heavy Stores |
| SMSBump | ✔️ | ✔️ | ❌ | Advanced | ❌ | High | SMS Marketing |
| Webkul Restock | ✔️ | ✔️ | ❌ | Medium | ❌ | High | International Stores |
| Notify Me! | ✔️ | ✔️ | ❌ | Basic | ❌ | Medium | Modern UI |
| Out of Stock Police | ✔️ | ✔️ | ❌ | Medium | ✔️ | Medium | Inventory + Alerts |
| Smart Restock Alerts | ✔️ | ✔️ | ❌ | Medium | ❌ | Medium | Flexible Alerts |
| Restockly | ✔️ | ✔️ | ❌ | Medium | ❌ | Medium | Modern D2C |
| Swym | ✔️ | ✔️ | ❌ | Advanced | ❌ | Advanced | Enterprise Stores |
If your store relies on SMS heavily, or you want full control over:
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SMS cost
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SMS gateway provider
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Sender ID
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Delivery speed
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Custom workflows
Then NotifyEZ – Messaging & Alerts is the best option available.
No other app gives merchants the ability to send SMS through any SMS gateway they choose, making NotifyEZ the most scalable and cost-efficient solution for global stores.