Line item upsell

A line item upsell adds a small link, such as “🎁 Subscribe & save”, under a product in the order summary. Clicking it opens a popover where the customer can switch that product to a subscription, or add a product that goes with it.

Requires: Shopify Plus and the Buddy plan.

Now part of the Cart line editor

Line item upsell isn’t offered for new blocks. The Cart line editor does the same with its Subscribe and Add-on buttons, and can show both, next to an Edit button or on their own. Line item upsells you’ve made keep working as they are. See move to the Cart line editor.

For upsells with an Add button, add-ons and free gifts, in checkout or on your product and cart pages, use Product offers.

Settings

Setting	What it does
Upsell type	Subscription upsell or Complementary add-on (requires Shopify Search & Discovery setup)
Text	The link under the product. Defaults to “Subscribe & save”.
CTA Text	The button in the popover. Defaults to “Subscribe”.
Text appearance	The link color: Base, Accent, Subdued, Info, Success, Warning, Critical, or Decorative
Text emphasis	None, Bold, or Italic
Icon	An icon before the text

There’s no product picker. The offer comes from the product it’s shown under.

Subscription upsell

The popover lists the product’s subscription plans, plus a quantity. Choosing a plan and clicking the button converts that cart item to a subscription. It doesn’t add a new product.

The link only shows under products that have subscription plans and aren’t already on one.

Complementary add-on

The popover shows the first complementary product you’ve set up for this product in Shopify’s Search & Discovery app, with a variant dropdown if needed. The button adds one of it to the cart.

The link hides when the product has no complementary products, or when one of them is already in the cart.

Place it under line items

Needs the line item location

This block only works under line items. In the Checkout Editor, place a Checkout Buddy (v1) or Cart line item app block under the line items in the order summary. Anywhere else it shows nothing.

It appears under every product it applies to. To limit which products show it, use conditions such as Target line item tags. See target conditions.

Move to the Cart line editor

Open your line item upsell and click Create a Cart line editor. In the new block:

1. Under Edit button, turn off Show an Edit button, unless you want customers to edit items too.
2. Turn on Show a Subscribe button for a Subscription upsell, or Show an Add-on button for a Complementary add-on. You can turn on both.
3. Copy your Text to the button’s Button text, and your CTA Text to its Popover button text.
4. Set the same conditions and markets, save, then turn off the old line item upsell.

The cart line editor’s add-on price shows in the customer’s currency, and its texts can be translated.

Things to know

• The add-on price in the popover always shows with a $ sign, so this option is best suited to stores that sell in dollars.
• Translations entered for this block aren’t used at checkout yet. Write the text in your checkout’s main language.
• Changes are blocked when the checkout doesn’t allow editing items, for example some B2B checkouts.