# How are Back-in-stock subscriptions and Subscribers list different? The Back-in-stock alerts in FoxKit app offers instant notifications for shoppers when items are available and ready for purchase again. :bell: You can also utilize this feature to capture shoppers' purchase intent and build your email list.

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## Back-in-stock subscriptions **Back-in-stock subscriptions are customers who sign up for the back-in-stock (BIS) form** shown on your out-of-stock products.

Data collected via the BIS form can be saved in your Shopify customers list and/ or FoxKit subscriptions list. To find this setting, go to [**Back-in-stock** > **Form settings**](https://docs.foxecom.com/foxkit-app/upsells/back-in-stock-alerts#form-settings).

{% hint style="warning" %} If you activate email notifications for BIS (emails to be sent automatically when the product is re-stocked), **data collection to be saved in FoxKit subscriptions list is required**. :mailbox\_with\_mail: Learn more about BIS email notifications: [#email-settings](https://docs.foxecom.com/foxkit-app/upsells/back-in-stock-alerts#email-settings "mention") {% endhint %} ## FoxKit Subscribers list Data of customers who **subscribe to your newsletter** ✉️ will be stored in FoxKit > **Subscribers**.

You will also find subscribers of FoxKit's [Pop-up](https://docs.foxecom.com/foxkit-app/sales-boosting/pop-up) and [Lucky wheel](https://docs.foxecom.com/foxkit-app/sales-boosting/lucky-wheel) there (if the feature's data collection is set as FoxKit subscribers list :white\_check\_mark:) .