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Overview

Upsell products may have one or multiple variant options (such as size or color). Aftersell handles out-of-stock variants differently depending on how many options a product has, to ensure a smooth customer experience and prevent unavailable selections.

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Out of Stock Variant Logic

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Products with a Single Variant Option

If a product has only one variant option and that variant is out of stock, it is hidden entirely. For example,
  • The blue variant for this Notebook product is out of stock Select Products dialog showing the Notebook Blue variant marked Out of Stock
  • Therefore, on the post purchase page, the blue variant will not show up as an option Post-purchase page with the Notebook colour dropdown listing only White and Black
This prevents customers from interacting with a product that cannot be fulfilled.

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Products with Multiple Variant Options

If a product has multiple variant options, all variant options are displayed, including those that are out of stock. By default, Aftersell will preselect an in-stock variant, if one is available. However, if a customer manually selects an out-of-stock variant, it will be clearly marked as unavailable and cannot be added. For example,
  • The blue/small variant for this T-shirt product is out of stock Select Products dialog showing the T-shirt blue Small variant marked Out of Stock
  • However, the variant will still appear on the live post-purchase page, but customers will not be able to purchase it if selected. Post-purchase T-shirt offer with an out-of-stock variant showing an Unavailable button
This approach gives customers full visibility into available options while preventing invalid selections. NOTE: This logic applies even if all variant settings are unchecked in the editor.

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Pre-Order and Pre-Sale Variants

The out-of-stock logic above applies to variants that can no longer be sold once their inventory runs out — Shopify’s default “Stop selling when out of stock” behavior. Pre-order and pre-sale variants are handled differently. In Shopify, these variants have “Continue selling when out of stock” enabled (an inventory policy of continue). Aftersell checks a variant’s inventory policy, not just its quantity on hand, so a continue-selling variant is treated as available even when its tracked inventory is 0 or negative. As a result, pre-order/pre-sale variants behave like in-stock variants on the post-purchase page:
  • Single variant option: the variant is shown (not hidden), and customers can add it.
  • Multiple variant options: the variant is selectable and purchasable — it is not marked as unavailable.
This lets you run pre-order or pre-sale offers as post-purchase upsells without the variant being suppressed for having no stock on hand.
To enable this behavior, turn on Continue selling when out of stock for the variant in Shopify (under the product’s variant Inventory settings). A variant left on the default stop selling when out of stock follows the out-of-stock logic described above once its inventory reaches 0.
Exception: if your offer is configured to hide products that are out of stock, continue-selling variants with 0 or negative inventory are hidden along with regular out-of-stock variants.