Running out of stock is not always a bad thing — especially if you know how to turn it into an opportunity. Instead of losing sales when products are unavailable, Shopify merchants can use back in stock apps to capture customer intent, notify shoppers when items are restocked, and recover lost revenue.

In this guide, we’ll explore the 9 best back in stock apps for Shopify, including features, benefits, real use cases, and links to each app on the Shopify App Store.

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

Here are a few ways to rewrite your content to make it more professional, persuasive, and scannable for Shopify merchants.

Option 1: Professional & Revenue-Focused (Best for App Store Listings)

Maximize Revenue: Turn “Out of Stock” into Automated Sales Opportunities

Stop losing customers to sold-out items. With our Back in Stock alerts, you can capture intent the moment a product runs out and automatically bring shoppers back when it’s restocked. This “set-it-and-forget-it” tool helps you retain interest and recover lost revenue with zero manual effort.

• Seamless Restock Subscriptions: Empower customers to sign up for instant notifications on specific products or variants.

• Automated & Manual Alerts: Choose to send notifications automatically upon restocking or trigger manual alerts for curated launches.

• Brand-Consistent Design: Fully customize the “Notify Me” button’s text, colors, and fonts to ensure a native look on any Shopify theme.

• Strategic Growth: Automatically sync your new subscribers to your Shopify customer list to fuel future marketing campaigns.

• No-Code Implementation: Install and launch in minutes—no technical expertise required.

• Expert Support: Get immediate assistance whenever you need it via our dedicated live chat and email support.

Get the Shopify app here.

🥈 2. NotifyEZ – Messaging & Alerts

The All-in-One Notification Engine: Email, SMS, & Smart Alerts

Take full control of your store’s communication with NotifyEZ. Streamline your workflow by managing customer alerts and internal staff notifications through a single, powerful platform. From inventory triggers to personalized customer milestones, NotifyEZ ensures the right message reaches the right person at the perfect time—all powered by your own preferred SMTP and SMS gateways for maximum reliability.

• Reliable Custom Email: Use your own SMTP provider to ensure high deliverability for all store and customer communications.

• Automated SMS Alerts: Keep customers and staff informed instantly with automated text notifications via integrated SMS gateways.

• Intelligent Inventory Tracking: Stay ahead of demand with low-stock, out-of-stock, and back-in-stock alerts sent directly to your team or your shoppers.

• Staff & Event Management: Set flexible rules for order updates, fulfillment changes, and new sales to keep your operation running smoothly.

• Personalized Customer Engagement: Boost loyalty with automated emails for birthdays, first-order anniversaries, and other key milestones.

• Fully Brandable: Effortlessly customize every template to match your store’s unique voice and aesthetic.

Get the Shopify app here.

🥉 3. Appikon – Back in Stock + Preorder

Maximize Revenue with Automated Waitlists and Restock Notifications

Don’t let “Out of Stock” be the end of the customer journey. Appikon Back in Stock helps you recapture lost revenue by automatically alerting shoppers the moment their favorite products return. Transform missed opportunities into a loyal waitlist and use data-driven insights to optimize your inventory strategy.

• Omnichannel Restock Alerts: Automatically notify customers via email and SMS as soon as products or back-order items are available.

• Instant, No-Code Setup: Get your back-in-stock system running in less than 2 minutes—no technical skills required.

• Seamless Brand Integration: Fully customize your signup forms and notifications to match any Shopify theme perfectly.

• Demand Intelligence: Leverage advanced analytics to track which out-of-stock products are in highest demand.

• Automated Waitlists: Build high-intent waitlists for upcoming or restocked items to guarantee future sales.

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

Maximize Revenue with AI-Powered Back-in-Stock Alerts & Pre-Order Strategies

Never let an “Out of Stock” badge stop a sale. Our platform helps you capture customer intent even when inventory is low. By combining automated restock alerts with AI-driven recommendations and strategic pre-order tools, you can maintain sales momentum and build a high-intent subscriber list effortlessly.

• Omnichannel Automation: Deliver instant, automated back-in-stock notifications and reminders via email and SMS.

• AI-Driven Alternatives: Keep customers on your site by showing AI-powered “In-Stock Recommendations” for sold-out items.

• Capture Early Demand: Use the Pre-Order and “Coming Soon” features to drive revenue before your inventory even arrives.

• Retargeting & Growth: Sync out-of-stock subscribers with your ESP (Email Service Provider) and run high-conversion Facebook or Instagram retargeting ads.

• Advanced Inventory Control: Manage complex logistics with batch alert sending, support for Shopify Locations, and demand analytics.

• Rapid, Global Setup: Go live in 5 minutes with a fully customizable, multilingual design that integrates seamlessly with any theme.

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

Maximize Revenue Effortlessly with Automated, Real-Time Restock Alerts

Stop losing sales to “Out of Stock” labels. Alert Me empowers your shoppers to subscribe to their favorite products and receive instant notifications the moment you restock. This fully automated, “set-it-and-forget-it” solution handles the entire notification cycle, allowing you to recover lost revenue and build customer loyalty without lifting a finger.

• Hands-Free Automation: Trigger restock notifications automatically as soon as inventory levels change—no manual intervention required.

• Instant Delivery: Alerts are sent in real-time, capturing customer intent while it’s at its peak to drive immediate conversions.

• Seamless Customization: Effortlessly adjust the design and colors of your forms to ensure a native, on-brand look for your store.

• Demand-Driven Analytics: Gain valuable insights by tracking the most-requested items to optimize your inventory planning.

• Unlimited Growth: Allow customers to sign up for as many alerts as they wish across all product and collection pages.

• Dedicated Support: Our team is committed to your success—we’re here to help you launch your first alerts in minutes.

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 (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)