Best free Stock alerts Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
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Oct 29, 2025
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. Notify Customers with back in stock alert when items are restock & make out-of-stock waitlist
Never miss a sales opportunity with REZ Notify Me, a complete back-in-stock alert solution for your Shopify store. When items are out of stock, display a customizable "Notify Me" button that lets customers join your product waitlist. The app automatically sends restock notifications via email when products become available again. Track customer demand through detailed product analytics while building your mailing list. With fully customizable notification templates and alert emails, you can keep shoppers engaged and informed about the items they want. Send up to 1,000 email notifications monthly and get support from our dedicated team via live chat or email whenever you need help.Install from Shopify App Store
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#2. Recover lost sales with AI-optimized email and SMS notifications when products are back in stock.
Never miss a sale with this smart back-in-stock notification app powered by AI technology. When products return to inventory, the system intelligently analyzes restock quantities, subscriber numbers, and past conversion data to send perfectly-timed email and SMS alerts to waiting customers. The customizable "EMAIL ME" button integrates seamlessly with your product pages, including Online Store 2.0. Merchants can easily edit notification templates in multiple languages through the app block. The system works automatically to optimize notification timing and volume for maximum sales recovery. Get started quickly with 24/7 live chat support available to help you set up and manage your back-in-stock alerts.Install from Shopify App Store