Best free Stock alerts Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
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Oct 08, 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. Win back out-of-stock lost sales with smarter auto email or SMS notifications when restocking.
Never miss a sale due to out-of-stock items with this easy-to-use notification system. The app automatically adds an "Email Me" button to your product pages, working seamlessly with Online Store 2.0. When items are back in stock, customers receive instant email or SMS alerts. Customize your notification templates in the block section to create engaging messages that bring shoppers back. The app supports multiple languages and includes 24/7 live chat support. Set up takes just one click - no coding needed. Perfect for both new and established stores looking to recover potential lost sales from out-of-stock situations.Install from Shopify App Store