Best free Stock alerts Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
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Jan 16, 2026
The Best Free Shopify stock alert apps help merchants manage inventory effectively while engaging customers. From low stock counters and product labels to back-in-stock notifications and preorder systems, these tools automatically track inventory levels, notify customers when items are restocked, and create urgency through stock-level displays. Whether you need waitlist management, automated restock alerts, or inventory forecasting, these free solutions keep both merchants and customers informed while preventing lost sales opportunities.
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#1. Recover sales with AI back-in-stock email & SMS alerts, popups, forms, and product page sections.
SendWILL Back In Stock helps you recover lost sales with AI-optimized back-in-stock alerts via email and SMS. The AI analyzes restock quantities, subscriber demand, and conversion rates to send notifications at the optimal time and volume for maximum conversions. The app includes customizable popups, forms, sold out badges, and native product page sections for Online Store 2.0 themes. Display back-in-stock buttons on out-of-stock product and collection pages to capture customer interest automatically. Merchants can freely edit email templates using block sections, choose from multiple language templates, and set up inventory alerts per warehouse or location. Quick setup with 24/7 live chat support ensures you're ready to notify customers and recover sales immediately.Install from Shopify App Store
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#2. Sell preorder & backorders with full/part payments. Notify me when out of stock, back in stock alert
REZ helps you sell preorder and backorder products with flexible payment options including deposits and partial payments. When items are out of stock, the app automatically adds a preorder button or notify me widget to your product pages, letting customers join waitlists and place presale orders to generate early revenue. The back in stock alert feature sends automatic restock notifications to customers on your waitlist when products become available again. You can customize the preorder button and back in stock notification messages to match your brand's look and feel. Built-in analytics let you track customer demand from notify me requests and preorder data, helping you forecast inventory needs and measure revenue performance. The app makes it easy to manage back orders, presales, and back in stock alerts all in one place, with online support available to help you grow your business.Install from Shopify App Store
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#3. Trigger FOMO & urgency with social proof, visitor counter, sales popup, low stock counter & review
Create authentic social proof and urgency with FOMO Sales Pop Up. Display real-time visitor counters, sales notifications, and product reviews to build instant trust with your store visitors. The app shows live purchase alerts, low stock counters, and inventory notifications that naturally encourage buying decisions. Keep shoppers engaged with discount gamification and countdown timers, while cart abandonment alerts help recover lost sales. Monitor your store's performance through real-time analytics. From social proof to FOMO triggers, this app helps turn your store traffic into actual customers.Install from Shopify App Store