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Best free Stock alerts Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
•
Jun 30, 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.
| Name | Rate on Shopify | Price | Free trial | Key features |
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#1. Sell preorders & backorders with full/partial payments. Auto send back-in-stock & coming soon alerts
REZ helps you sell preorders and backorders for out-of-stock products so you never miss a sale. Accept pre-order and presale orders with full or partial payments and deposits to generate revenue early. Set up automated back-in-stock alerts and coming soon notifications to keep customers informed when products are restocked. The Notify Me feature lets shoppers join waitlists and request interest in unavailable items. Track demand and forecast inventory with built-in conversion analytics. Manage preorders easily in Shopify with deposit options and discounts to encourage sales. Quick 24/7 support helps you get started in minutes. Install REZ today to capture every sales opportunity. -
#2. Increase conversions with Preorders, Partial Payments, Back in Stock.
PreOrder Bat helps you manage pre-orders and product availability on your Shopify store. Accept preorders for new launches, out-of-stock items, or products you're testing for demand. Capture customer interest early and drive sales before items are available. The app supports partial payments, letting customers reserve products with a deposit and pay the balance later. Send Back in Stock and Notify Me alerts with Klaviyo sync to recover missed sales. Use countdown timers and low-stock counters to create urgency. Built for both B2B preorders and retail, with support for multiple locations and split shipping for separate fulfilments. Manage Coming Soon products and wishlist features with essential customisation options. Get 24/7 support via live chat, email, phone, and video call. -
#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. -
#4. Automated, personalized back in stock alerts with branded follow-up emails to recover lost sales.
XFlow Back in Stock Alert helps you recover lost sales by sending automated, personalized back in stock alerts to customers. Add a back in stock button to any product page to capture signups and send branded restock alerts with custom email designs. Target customers by product, collection, or segment based on their behavior and purchase history. Send unlimited follow-up emails per restocked product instead of just one restock alert. Set up simple workflows to automate your back in stock emails, then reuse templates and workflows across multiple campaigns. Track subscriber demand and performance to optimize conversions. Get notifications for your internal team when products are restocked. Includes 24/7 live chat support to help you maximize results from your back in stock campaigns. -
#5. Notify customers when products are back in stock and manage an out-of-stock waitlist.
Never miss a sale due to out-of-stock items with this essential Back in Stock notification app. When products are unavailable, customers can join a waitlist directly from your product pages and receive automatic alerts once items are restocked. The app manages your out-of-stock waitlist efficiently while letting you export customer emails for marketing purposes. Customize the notification pop-up form to match your store's branding and integrate seamlessly across home, product, and collection pages. With easy installation and theme compatibility, you can start recovering potentially lost sales and keeping customers engaged. The app includes 24/7 support to help you maximize its features and maintain smooth operation. -
#6. Notify customers by restock alert when items are back in stock & create an out-of-stock waitlist.
Never miss a sale with Back In Stock! Alert Engine, a complete solution for managing out-of-stock products. When items are unavailable, customers can click the customizable "Notify Me" button to join your waitlist. The app automatically sends restock alerts via email once products return to inventory. Track customer demand through detailed waitlist analytics and expand your mailing list naturally. Beyond restock notifications, the app handles price drop alerts, low stock warnings, and abandoned cart follow-ups. Works seamlessly with popular email platforms like Klaviyo and supports multiple languages. The user-friendly setup takes minutes, fits most Shopify themes, and includes 24/7 customer support to help you maximize recovery of lost sales opportunities. -
#7. Capture revenue, predict demand with preorder & automated restock alerts
TA Preorder & Back In Stock helps you recover lost sales from out-of-stock products and capture revenue from upcoming launches. Set up preorder, backorder, and presale campaigns with full or partial payment options. Send automated back in stock alerts to customers waiting for restocked items. Add customizable preorder or notify me widgets to your products and collections with seamless theme integration. The app auto-translates its interface and lets you manually customize storefront text for each language. Track demand and forecast inventory using built-in analytics to measure revenue performance and make smarter stocking decisions. -
#8. Smart inventory management with real-time alerts, automation, & analytics for zero stock-out issues.
Out Of Stock Alert Restock Lab helps you manage inventory with smart automation and real-time alerts. Get instant notifications via email, Slack, or WhatsApp when stock levels drop, so you can avoid lost sales from out-of-stock issues. The app lets you set up automated alerts for specific products, variants, collections, vendors, tags, and SKUs. You can configure stock thresholds for multiple locations and send alerts to multiple recipients. Advanced sales forecasting and analytics help you calculate reorder quantities accurately. The system provides detailed inventory reports with scheduled CSV and PDF exports, making inventory control simple and efficient. Filter alerts with bulk upload options and customize everything to match your workflow. -
#9. Preorder & Presale Manager: Back In Stock Alerts, Notify Me Restock Emails & Partial Payments.
This app helps you capture sales even when products are out of stock. Replace "Sold Out" buttons with Pre Order Now options to keep revenue flowing. Run presale campaigns for coming-soon items and offer flexible partial payments or deposits to customers. Set up Back In Stock alerts through Notify Me widgets to automatically send restock emails when inventory returns. Manage preorder limits, shipping dates, and waitlists with ease. Customize Pre Order buttons across product pages, collections, and quick buy sections. Configure preorder start and end dates, quantity limits, and shipping estimates. Perfect for handling backorders and pre-selling products before they're available. Capture more leads and never miss a sale opportunity again. -
#10. Urgency Product Badges, stock labels. Add urgency and FOMO by showing scarcity on product badges
Create a sense of urgency and drive more sales with Urgency Product Badges that display real-time inventory levels on your store. Show compelling product labels like "Only 2 left in Stock" or "Selling Quickly" to tap into customers' FOMO (Fear of Missing Out). Customize your badges with eye-catching emojis and engaging titles that highlight scarcity. These attention-grabbing stock labels can be placed throughout your store pages, helping customers make faster purchase decisions. Whether you want to showcase limited availability or high demand, these product badges help build excitement and encourage shoppers to act quickly before items sell out.
