Product Stock Notification Alert for OpenCart helps store owners recover lost sales by allowing customers to subscribe for notifications when out-of-stock products become available again.
When a product is unavailable, the default Add to Cart button is replaced with a Notify Me option. Customers can submit their email and receive automatic notifications once the product is restocked.
The extension supports product-level and option-level alerts, ensuring accurate notifications even for configurable products such as size, color, or other variations.
Built-in automation, analytics, and customer self-service tools make this a complete solution for managing demand and improving conversion rates in your OpenCart store.
Customers often leave an OpenCart store when they see a product is out of stock. Without a notification system, these potential buyers may never return, resulting in lost sales and missed revenue opportunities.
Store owners also lack visibility into which products customers are actively waiting for, making it difficult to plan inventory effectively.
This extension solves the problem by allowing customers to subscribe for stock alerts and automatically notifying them when the product becomes available again, bringing interested buyers back to complete their purchase.
This OpenCart extension is ideal for:
The purpose of this OpenCart extension is to help store owners capture customer interest even when products are unavailable.
Instead of losing potential buyers, customers can subscribe for stock alerts and receive notifications when products are restocked.
The extension also provides valuable insights into customer demand, helping store owners make informed inventory decisions and improve product availability strategy.
By automating communication and providing demand analytics, this extension helps increase sales and improve customer satisfaction.
Install and configure the extension from your OpenCart admin panel.
Choose how you want stock alerts to work:
Customers will see the Notify Me button when the product becomes unavailable.
Customers subscribe by entering their email address.
When the product is restocked, customers receive an email notification automatically.
Admin can also send notifications manually or review demand insights from the dashboard.
Cron job can be configured to fully automate the process.
Customers can manage their alerts using the premium self-service page.
Explore what this extension can do for your store, with practical examples.
| Feature | What it does / Real-world example |
|---|---|
| Let shoppers request a back-in-stock alert | When a product is treated as unavailable, shoppers can submit a request to be notified when the store considers it available again. |
| Show a Notify Me button for unavailable products | The extension adds an alternative notification action where its configured stock rules say an item cannot currently be purchased. |
| Request alerts for specific product options | For products with selectable options, the extension can retain the option values involved in the customer's stock alert. |
| Record how many units a shopper needs | An alert request can record the customer's requested quantity, helping the store understand demand beyond a simple subscriber count. |
| Accept notification requests from guest shoppers | Customers can request a stock alert without first signing into an OpenCart customer account. |
| Choose which contact details to ask for | The notification form can show configured name, email, mobile-number and comments fields, with optional required-field rules. |
| Offer popup or embedded notification forms | Choose a popup-style alert form or an embedded form to suit the storefront's product-page layout. |
| Choose the notification popup's appearance | Available popup effects and custom CSS help the alert form better match a store's theme. |
| Protect the subscription form with optional reCAPTCHA | When enabled and configured, Google reCAPTCHA checks a shopper's alert submission. |
| Warn shoppers about duplicate notification requests | The submission flow checks for an existing matching stock-alert request before saving another one. |
| Acknowledge successful alert subscriptions | An optional acknowledgement email can confirm that a shopper's notification request was recorded. |
| Notify subscribers when products become available | Pending subscribers can receive a back-in-stock email when the configured notification process determines that their product is available. |
| Link notification emails back to the product | Back-in-stock messages can include a direct product link, with optional campaign parameters for analytics. |
| Support stock-alert messages by SMS when configured | With a suitable SMS HTTP API or a separately installed OpenCart SMS integration, the extension can send configured acknowledgement or back-in-stock texts. |
| Display notification text in each store language | Configure language-specific button labels, form messages, placeholders, warnings and acknowledgement wording. |
| Feature | What it does / Real-world example |
|---|---|
| Choose when low stock should trigger the Notify button | Set a stock quantity threshold for deciding when products should offer the notification form. |
| Apply optional out-of-stock status filters | Select which OpenCart stock statuses should be considered when applying quantity-based alert rules. |
| Control the Notify button product by product | Switch to manual mode and choose which products display the alert button, regardless of their physical quantity or stock status. |
| Mark a manually selected product ready for notification | In manual mode, deselect a product from the alert list to make its pending subscribers eligible for the next notification run, even if quantity remains zero. |
| Send selected notifications without a stock check | Select subscription records in Alerts and use Notify Selected (Overrides Stock Check) to send eligible messages without checking quantity or stock status. |
| Check products and send notifications on demand | Use the Check Products & Notify action to run the configured stock checks and process pending requests without waiting for cron. |
| Review every saved stock-alert request | The Alerts tab lists saved requests, including products, customer details, quantities, request dates and notification dates where available. |
| Find specific alerts quickly | Search subscriptions using product and customer details and filter the results by category, manufacturer, product status or notification state. |
| See subscriber and purchase information | Available records can show contact details, customer age, prior completed orders and purchase indicators to help evaluate demand. |
| See which unavailable products customers want | The Demand tab consolidates stock-alert requests by product and shows requested quantities, alert totals and notified counts. |
| Manage out-of-stock products from one list | The Out-of-Stock Products tab provides a searchable view of relevant products, quantities, option quantities, stock statuses and notification controls. |
| Update product stock directly from the extension | Change a product's quantity from the alert-management interface instead of opening the full product editor. |
| Update quantities for product option values | Where option-stock information is available, edit individual option quantities from the management list. |
| Spot differences between product and option quantities | The product list can warn when a product's main quantity differs from the sum of its option quantities. |
| Change a product's out-of-stock status quickly | Update the selected product's OpenCart stock status directly from the stock-alert management screen. |
| Enable or disable products from the alert list | Change product status from the management table without navigating to the full product editor. |
| Filter the stock-management list | Find products by supported identifying details and narrow the view with category, manufacturer, enabled state and notification status. |
| Remove or reset selected stock alerts | Selective operations can delete selected subscription records or reset their notification state for further processing. |
| Create and maintain notification email templates | Create, edit, rename, preview and remove templates used for subscription acknowledgement, admin alerts and back-in-stock messages. |
| Start emails from built-in layouts and samples | Choose a starting email layout and content sample, then customize its width, colors and text in the template editor. |
| Edit the notification email body visually | The built-in rich-text editor supports changes to email content and formatting without requiring a separate email designer. |
| Insert live product and subscriber details into email templates | Supported placeholders can be replaced with store, product, price, customer and notification details when the message is prepared. |
| Configure sender, reply and subject information | Templates support sender name, sender address, reply-to, subject and optional BCC settings. |
| Preview emails at different screen widths | Review template output in desktop, tablet and mobile preview widths before using it for notifications. |
| Use separate templates for different alert events | Assign appropriate email designs for subscription acknowledgement, new-subscription admin notices and back-in-stock notifications. |
| Choose notification templates by language | Select supported customer-facing email templates for each configured OpenCart language. |
| Receive admin email alerts for new subscriptions | When enabled, a configured administrator address receives a notification when a shopper submits a stock-alert request. |
| Enable or disable individual email types | Control whether acknowledgement, administrator and back-in-stock email messages are enabled. |
| Customize acknowledgement and back-in-stock SMS text | Define language-specific SMS message content and enable supported SMS events when an SMS delivery method is configured. |
| Configure required fields and phone-length checks | Choose required contact fields and set minimum and maximum lengths for mobile numbers. |
| Adjust the form design and popup dependencies | Configure custom CSS, popup animation and whether to include the extension's Magnific Popup assets. |
| Customize per-language form labels and errors | Edit notification button text, informational copy, field labels, placeholders and validation messages separately for each language. |
| Manage alert settings for different OpenCart stores | Switch between stores to maintain relevant alert settings, records and configured email templates. |
| See notification trends and products in demand | Statistics include monthly alert trends, notified-versus-pending totals and leading demanded products, brands and categories. |
| Export subscription, product and demand records | Download the supported Alerts, Out-of-Stock Products and Demand datasets as CSV files. |
| Choose the information shown in admin lists | Toggle available product and customer detail columns so the management tables focus on relevant information. |
| Inspect notification processing logs | Enable operational logs to review processing activity and clear them from the admin when no longer needed. |
| Clean old or unwanted notification records | Tools can delete all, pending-only or already-notified alert records, and include a repair action for invalid historical notification dates. |
| Feature | What it does / Real-world example |
|---|---|
| Automatically check pending alerts on a schedule | Configure the supplied authenticated cron command to process pending subscriptions according to the selected stock rules. |
| Process manual availability changes through cron | In manual-product mode, scheduled processing can notify pending subscribers after the relevant product is no longer selected for alerts. |
| Respect option-level stock during automatic notifications | For subscriptions involving selected options, the normal automatic sender checks option quantities before treating the requested variation as available. |
| Record when a customer notification was sent | When the send routine reports success, the extension updates the alert's notified date for reporting and future processing. |
| Email a consolidated product-demand report to admin | A separate authenticated cron endpoint can send the store administrator a report of products customers are waiting for. |
| Restrict scheduled actions with an access key | The notification and demand-report endpoints check the configured authentication key before processing cron requests. |
| Feature | What it does / Real-world example |
|---|---|
| Let shoppers request a back-in-stock alert | When a product is treated as unavailable, shoppers can submit a request to be notified when the store considers it available again. |
| Show a Notify Me button for unavailable products | The extension's OpenCart 4 storefront integration can present a notification action when configured stock-validation rules identify an unavailable product. |
| Request alerts for specific product options | For products with selectable options, the extension can retain the option values involved in the customer's stock alert. |
| Record how many units a shopper needs | An alert request can record the customer's requested quantity, helping the store understand demand beyond a simple subscriber count. |
| Accept notification requests from guest shoppers | A shopper can register a stock alert without creating or signing into an OpenCart customer account. |
| Prefill contact details for signed-in customers | When a shopper is logged in, the stock-alert form can prefill their name, email and telephone using available account details. |
| Choose which contact details to ask for | The notification form can show configured name, email, mobile-number and comments fields, with optional required-field rules. |
| Offer popup or embedded notification forms | Choose a popup-style alert form or an embedded form to suit the storefront's product-page layout. |
| Choose the notification popup's appearance | Available popup effects and custom CSS help the alert form better match a store's theme. |
| Protect the subscription form with optional reCAPTCHA | When enabled and configured, Google reCAPTCHA checks a shopper's alert submission. |
| Warn shoppers about duplicate notification requests | The submission flow checks for an existing matching stock-alert request before saving another one. |
| Acknowledge successful alert subscriptions | An optional acknowledgement email can confirm that a shopper's notification request was recorded. |
| Notify subscribers when products become available | Configured back-in-stock emails can notify subscribers when the stock-alert process determines that their product is available again. |
| Link notification emails back to the product | Back-in-stock messages can include a direct product link, with optional campaign parameters for analytics. |
| Support stock-alert messages by SMS when configured | Configure an SMS HTTP API to send supported subscription and availability messages; the separate HuntBee SMS integration requires its own installation. |
| Display notification text in each store language | Configure language-specific button labels, form messages, placeholders, warnings and acknowledgement wording. |
| Feature | What it does / Real-world example |
|---|---|
| Choose when low stock should trigger the Notify button | Set a stock quantity threshold for deciding when products should offer the notification form. |
| Apply optional out-of-stock status filters | Select which OpenCart stock statuses should be considered when applying quantity-based alert rules. |
| Control the Notify button product by product | Switch to manual mode and choose which products display the alert button, regardless of their physical quantity or stock status. |
| Mark a manually selected product ready for notification | In manual-selection mode, turning off a product's Notify setting makes its pending subscribers eligible for back-in-stock notification on the next run, even with zero inventory. |
| Send selected notifications without a stock check | From the Alerts tab, choose subscription records and use Notify Selected to send them without quantity or stock-status checks. |
| Check products and send notifications on demand | Use Check Products & Notify to process pending alerts based on the selected stock rules without waiting for a scheduled job. |
| Review every saved stock-alert request | The Alerts tab lists saved requests, including products, customer details, quantities, request dates and notification dates where available. |
| Find specific alerts quickly | Search subscriptions using product and customer details and filter the results by category, manufacturer, product status or notification state. |
| See subscriber and purchase information | Available records can show contact details, customer age, prior completed orders and purchase indicators to help evaluate demand. |
| See which unavailable products customers want | The Demand tab consolidates stock-alert requests by product and shows requested quantities, alert totals and notified counts. |
| Manage out-of-stock products from one list | The Out-of-Stock Products tab provides a searchable view of relevant products, quantities, option quantities, stock statuses and notification controls. |
| Open stock alerts from the administrator navigation | The extension registers an admin navigation link with a count of pending stock-alert subscriptions, helping staff find requests to review. |
| Update product stock directly from the extension | Change a product's quantity from the alert-management interface instead of opening the full product editor. |
| Update quantities for product option values | Where option-stock information is available, edit individual option quantities from the management list. |
| Spot differences between product and option quantities | The product list can warn when a product's main quantity differs from the sum of its option quantities. |
| Change a product's out-of-stock status quickly | Update the selected product's OpenCart stock status directly from the stock-alert management screen. |
| Enable or disable products from the alert list | Change product status from the management table without navigating to the full product editor. |
| Filter the stock-management list | Find products by supported identifying details and narrow the view with category, manufacturer, enabled state and notification status. |
| Remove or reset selected stock alerts | Selective operations can delete selected subscription records or reset their notification state for further processing. |
| Create and maintain notification email templates | Create, edit, rename, preview and remove templates used for subscription acknowledgement, admin alerts and back-in-stock messages. |
| Start emails from built-in layouts and samples | Choose a starting email layout and content sample, then customize its width, colors and text in the template editor. |
| Edit the notification email body visually | The built-in rich-text editor supports changes to email content and formatting without requiring a separate email designer. |
| Insert live product and subscriber details into email templates | Supported placeholders can be replaced with store, product, price, customer and notification details when the message is prepared. |
| Configure sender, reply and subject information | Templates support sender name, sender address, reply-to, subject and optional BCC settings. |
| Preview emails at different screen widths | Review template output in desktop, tablet and mobile preview widths before using it for notifications. |
| Use separate templates for different alert events | Assign appropriate email designs for subscription acknowledgement, new-subscription admin notices and back-in-stock notifications. |
| Choose notification templates by language | Select supported customer-facing email templates for each configured OpenCart language. |
| Receive admin email alerts for new subscriptions | When enabled, a configured administrator address receives a notification when a shopper submits a stock-alert request. |
| Enable or disable individual email types | Control whether acknowledgement, administrator and back-in-stock email messages are enabled. |
| Customize acknowledgement and back-in-stock SMS text | Define language-specific SMS message content and enable supported SMS events when an SMS delivery method is configured. |
| Configure required fields and phone-length checks | Choose required contact fields and set minimum and maximum lengths for mobile numbers. |
| Adjust the form design and popup dependencies | Configure custom CSS, popup animation and whether to include the extension's Magnific Popup assets. |
| Customize per-language form labels and errors | Edit notification button text, informational copy, field labels, placeholders and validation messages separately for each language. |
| Manage alert settings for different OpenCart stores | Use the admin store switcher to manage supported stock-alert settings, subscription data and email template assignments for different storefronts. |
| See notification trends and products in demand | Statistics include monthly alert trends, notified-versus-pending totals and leading demanded products, brands and categories. |
| Export subscription, product and demand records | Download the supported Alerts, Out-of-Stock Products and Demand datasets as CSV files. |
| Choose the information shown in admin lists | Toggle available product and customer detail columns so the management tables focus on relevant information. |
| Inspect notification processing logs | Enable operational logs to review processing activity and clear them from the admin when no longer needed. |
| Clean old or unwanted notification records | Tools can delete all, pending-only or already-notified alert records, and include a repair action for invalid historical notification dates. |
| Feature | What it does / Real-world example |
|---|---|
| Automatically check pending alerts on a schedule | The extension provides an authenticated cron command for processing pending stock-alert requests on a configured schedule. |
| Process manual availability changes through cron | In manual-product mode, scheduled processing can notify pending subscribers after the relevant product is no longer selected for alerts. |
| Respect option-level stock during automatic notifications | For subscriptions involving selected options, the normal automatic sender checks option quantities before treating the requested variation as available. |
| Record when a customer notification was sent | When the send routine reports success, the extension updates the alert's notified date for reporting and future processing. |
| Email a consolidated product-demand report to admin | A separate authenticated cron command prepares and emails a consolidated report of products shoppers are waiting for. |
| Restrict scheduled actions with an access key | The cron endpoints validate a configured authentication key before carrying out notification or demand-report processing. |
Open the product page:
Women Purple Heat Gear High-Rise Tights
https://opencart-demo.huntbee.com/demo/women-purple-heat-gear-high-rise-tights-17254908
This product is currently out of stock.
Instead of the default Add to Cart button, the extension displays a Notify Me button. This allows customers to subscribe to be notified when the product becomes available again.
Click the Notify Me button.
A subscription form will appear where the customer can enter the required quantity and email address to register for the stock alert.
Once submitted, the alert is saved and the customer will be notified automatically when the product quantity is updated.
Open the product page:
One Shoulder Satin Slip Dress
https://opencart-demo.huntbee.com/demo/one-shoulder-satin-slip-dress-agg42245
This product contains multiple options with different stock availability.
This helps store owners track demand even at the option level.
Open the category page:
https://opencart-demo.huntbee.com/demo/fashion
Locate the product:
ZIMMERMANN Wrapped Ruffle-Trim Dress
This product is out of stock, so the Notify Me button is displayed directly in the product listing.
Click the Notify Me button to open the subscription form.
Customers can subscribe without visiting the product page, making the process faster and more convenient.
The same behavior can also be observed in:
Admin Dashboard:
https://opencart-demo.huntbee.com/demo/admin/index.php?route=extension/module/hb_oosn&store_id=0
Login credentials are already prefilled in the demo.
After logging in, navigate to the Stock Alert extension to view:
Displays all customer subscription records, including product name, quantity requested, email address, and subscription date.
This helps you understand which products customers are waiting for.
Shows graphical insights that help you analyze demand trends and identify high-interest products.
Allows you to create and manage multiple email templates for sending stock notifications.
You can customize email content according to your store branding.
Configure how the notify form appears on the storefront.
You can choose between:
Popup form
Embedded form directly on product page
Control where the Notify button appears.
You can configure rules based on:
Product quantity
Stock status
Or manually choose specific products where the notify button should appear.
Displays products currently out of stock.
You can manually select products where the Notify button should be enabled.
This gives full control over how the feature is applied across your store.
This demo shows how the extension helps capture customer demand, track interest in out-of-stock products, and bring customers back to your store once items are available.
| OPENCART | |
| Compatibility | 4.1.0.4, 4.1.0.3, 4.1.0.2, 4.1.0.1, 4.1.0.0, 4.0.2.3, 4.0.2.2, 4.0.2.1, 4.0.1.1, 4.0.1.0, 4.0.0.0, 3.0.5.1, 3.0.5.0, 3.0.4.1, 3.0.4.0, 3.0.3.9, 3.0.3.8, 3.0.3.7, 3.0.3.6, 3.0.3.5, 3.0.3.3, 3.0.3.2, 3.0.3.1, 3.0.3.0, 3.0.2.0, 3.0.1.2, 3.0.1.1, 3.0.1.0, 3.0.0.0, 2.3.0.2, 2.3.0.1, 2.3.0.0, 2.2.0.0, 2.1.0.2, 2.1.0.1, 2.0.3.1, 2.0.2.0, 2.0.1.1, 2.0.1.0, 2.0.0.0 |
| Requirement | OCMOD for opencart 2.x.x.x and 3.x.x.x, VQMOD for OpenCart 4.x.x.x |
| Core Files Overwrite | No Core files overwritten |
| Multi-store | Yes |
| Multi-lingual | Yes |
| SUPPORT | |
| Template Support | Free support is applicable only for one template. |
| TECHNOLOGIES | |
| Framework | OpenCart |
| VERSION : 3.11.0 | DATE RELEASED: 22 Apr 2026 |
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| VERSION : 10.0.7 | DATE RELEASED: 04 Feb 2024 |
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| VERSION : 10.0.6 | DATE RELEASED: 20 Jan 2024 |
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| VERSION : 10.0.5 | DATE RELEASED: 26 Apr 2023 |
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| VERSION : 10.0.4 | DATE RELEASED: 15 Mar 2022 |
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| VERSION : 10.0.2 | DATE RELEASED: 03 Jan 2022 |
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| VERSION : 10.0.1 | DATE RELEASED: 08 Dec 2021 |
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| VERSION : 10.0.0 | DATE RELEASED: 03 Nov 2021 |
Extension redesigned & more features added
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| VERSION : 9.0.5 | DATE RELEASED: 13 Aug 2019 |
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| VERSION : 9.0.4 | DATE RELEASED: 04 Jun 2019 |
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| VERSION : 9.0.2 | DATE RELEASED: 25 Mar 2019 |
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| VERSION : 9.0.0 | DATE RELEASED: 12 Jan 2019 |
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| VERSION : 8.0 | DATE RELEASED: 15 Jun 2017 |
This update is only for OpenCart Versions 2.0.x.x, 2.1.x.x, 2.2.0.0, 2.3.x.x
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| VERSION : 7.8.1 | DATE RELEASED: 03 Feb 2017 |
Update extension from 7.8 to 7.8.1 Only overwrite the admin and catalog folder files. Do not replace XML files. | |
| VERSION : 7.7 | DATE RELEASED: 17 Aug 2016 |
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| VERSION : 7.6 | DATE RELEASED: 05 Jan 2016 |
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| VERSION : 7.5 | DATE RELEASED: 26 Dec 2015 |
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| VERSION : 7.0 | DATE RELEASED: 24 Oct 2015 |
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