Best free Stock alerts Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
•
Feb 06, 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.
-
#1. Recover sales with AI inventory alerts(email & SMS), popups, forms, and product page sections.
SendWILL Back In Stock helps you recover lost sales through AI-optimized email and SMS alerts for out-of-stock products. The AI analyzes restock quantities, subscriber demand, and conversion rates to send back in stock notifications at the perfect time and volume. The app includes customizable popups, forms, sold out badges, and native product page sections for Online Store 2.0 themes. You can display notify me buttons on product and collection pages, then automatically alert customers when items are available again. Edit email templates freely using block sections and choose from multiple language options. Set up inventory alerts per warehouse or location to manage notifications across different stock points. The app is quick to install, easy to customize to match your store's theme, and comes with 24/7 live chat support to help you maximize recovered sales.Install from Shopify App Store
-
#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
-
#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
-
#4. Increase conversions with Preorders, Partial Payments, Back in Stock.
PreOrder Bat helps you manage pre-orders and product availability in your online store effectively. Accept pre-orders for upcoming products, restock notifications for sold-out items, and partial payments through deposits. The app lets merchants set custom pre-sale parameters and notify customers when inventory is back in stock. Perfect for product launches, inventory management, and testing market demand. Customize button text and placement to match your store's look. The solution works well for B2B merchants and stores with multiple locations, giving you complete control over how customers reserve and purchase products before they're available. With options for "Notify Me," "Coming Soon," and "Back in Stock" features, you can keep customers engaged and secure sales even when items aren't immediately available.Install from Shopify App Store