Running out of stock is inevitable for growing Shopify stores — especially when products sell fast.
But every “sold out” moment is also a lost sales opportunity — unless you can turn it into a comeback.

That’s where Back in Stock & Stock Alert Apps come in.

These tools automatically notify customers when out-of-stock items are available again, helping you:

• Recover lost sales instantly

• Keep shoppers engaged even when inventory runs low

• Automate customer communication

• Build anticipation for product restocks

In this guide, we’ll explore the best back-in-stock apps for Shopify in 2025, comparing features, automation tools, and pricing — including our top pick, NotifyEZ – Messaging & Alerts, a flexible, multi-channel notification app that goes beyond standard restock alerts.

Key Features to Look for in a Back-in-Stock App

Before you choose an app, make sure it offers these essentials:

✅ Multi-channel notifications (Email, SMS, Push)
✅ Easy customization (brand colors, messaging)
✅ Integration with inventory and product variants
✅ Performance analytics (clicks, conversions, subscribers)
✅ Flexible triggers (per product, variant, or collection)
✅ Automation without coding

Top 10 back-in-stock apps for Shopify in 2025

🥇 1. Back in Stock: Restock Alerts

Best for: Stores looking for a reliable, easy-to-use solution for restock notifications.

Overview:
“Back in Stock: Restock Alerts” by Back in Stock Co. is one of the most popular Shopify apps for managing product alerts.
It lets customers subscribe via email, SMS, or push, and automatically sends them a notification when the product is restocked.

Key Features:

• Customizable email/SMS alerts

• Variant-level restock detection

• Mobile-friendly subscription forms

• Analytics dashboard for tracking conversions

• Works with most Shopify themes

Pricing:
Free plan available; paid plans start at $19/month

Pros:
✅ User-friendly interface
✅ Reliable automation
✅ Strong analytics

Cons:
❌ Limited design flexibility
❌ Some advanced features only on higher plans

Verdict:
A great all-rounder for stores wanting plug-and-play restock alerts without much setup.

Get the Shopify app here.

🥈 2. NotifyEZ – Messaging & Alerts

Best for: Shopify merchants who want multi-channel notifications (Email, SMS & more) with full control over delivery through their own gateways.

Overview:
NotifyEZ – Messaging & Alerts is a next-generation communication app that does more than just restock alerts. It allows merchants to automate notifications across multiple channels — email, SMS, or even internal staff alerts — using their own SMTP or SMS gateways.

That means you’re not tied to a third-party service — you control your sending infrastructure, costs, and delivery speed.

NotifyEZ is perfect for merchants who want to manage back-in-stock alerts, order updates, or internal notifications all from one app — without writing any code.

Key Features:

• Multi-channel notifications: Send via Email, SMS, or custom gateways

• Full flexibility: Connect your own SMTP or SMS provider using your credentials

• Custom or pre-built templates for restock, order, and system alerts

• No-code automation: Create flexible triggers for any Shopify event

• Send to customers and staff simultaneously

• Detailed logs with resend options in case of errors

Pricing:
Free to install; usage-based pricing depending on notification volume.

Pros:
✅ Supports Email + SMS + internal notifications
✅ Connects your own messaging infrastructure
✅ Ideal for technical or enterprise-level stores
✅ Highly customizable — no coding required

Cons:
❌ Requires SMTP or SMS gateway setup
❌ Interface focuses more on flexibility than visuals

Verdict:
NotifyEZ is a powerful all-in-one app for merchants who want complete control and scalability.
Perfect for stores managing large order volumes or those that need automated, multi-channel communication — not just restock alerts.

Get the Shopify app here.

🥉 3. Appikon – Back in Stock + Preorder

Best for: Stores needing both restock alerts and preorder options.

Overview:
Appikon combines two features — Back in Stock Alerts and Preorders — helping you capture interest before and after items are available.

Key Features:

• Email & SMS alerts

• Preorder button for out-of-stock products

• Shopify theme integration

• Real-time inventory sync

• Works with Shopify Flow

Pricing:
Free plan available; paid from $19.99/month

Pros:
✅ 2-in-1 solution (alerts + preorders)
✅ Great UI and customization
✅ Works seamlessly across devices

Cons:
❌ Preorder customization can be limited

Verdict:
A smart choice for stores that want to engage customers both before and after restocks.

Get the Shopify app here.

4. Now Back in Stock

Best for: Simple email and SMS restock notifications.

Key Features:

• Email + SMS support

• Variant-level subscriptions

• Easy dashboard with analytics

• GDPR-compliant data collection

Pricing:
From $9/month

Verdict:
An affordable, lightweight app for small to medium stores.

5. Back In Stock Alerts by Swym

Best for: Shopify Plus stores needing robust automation.

Features:

• Multi-language support

• Email, SMS, and push notifications

• Works with Shopify Flow & Klaviyo

• Advanced customer segmentation

Pricing:
From $14.99/month

Verdict:
A premium app built for large Shopify stores that rely heavily on automation and branding.

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 Notifications

Best for: Small stores seeking simplicity.

Features:

• Email-only alerts

• Easy setup

• Responsive design

Pricing:
From $8/month

Verdict:
Straightforward and budget-friendly for new Shopify merchants.

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. Zooomy Back in Stock Alerts

Best for: Shopify users who want full design control.

Features:

• Fully customizable forms

• Email templates with drag-and-drop builder

• Works with most Shopify themes

Pricing:
From $10/month

Verdict:
Flexible and reliable with good customer support.

Get the Shopify app here.

10. Klaviyo (with Back-in-Stock Flow)

Best for: Merchants already using Klaviyo for email marketing.

Features:

• Back-in-stock automation flow

• Advanced segmentation

• Integrates with Shopify inventory and customer data

Pricing:
Free up to 500 contacts; paid from $20/month

Verdict:
Excellent option for established brands using Klaviyo for broader email campaigns.

Comparison Table: Best Back-in-Stock & Alert Apps for Shopify (2025)