This is Richard from PageFly - Shopify Page Builder App. Based on the page you sent, I’ve checked and I think this is the app:
BYOB ‑ Build Your Own Bundles
You can install the app to check or ask their support team for more information. If you want to have more options, you can check some others upsell and cross-sell apps too such as:
Thanks for replying. Unfortunately that’s not the same app being used
I’m looking for an app where based on how many items they add to their bundle the higher the discount is. If you look at the link (click here) as you add items to the cart it adds to to the top to show what type of discount you’ll be receiving. It also lets you filter by collection so you can link all your collections.
I am the product owner of BYOB - Build Your Own Bundles. Look like the GlowieByHer store is a custom build. While our standard template is using a footer, the template can be customized to make an empty-slot header like your reference.
Here’s a sample bundle built by our partner. The page is not launched yet so I can’t share the link with you:
Based on your requirement — allowing customers to create their own custom bundles and applying discounts based on the number of items in the cart" — I believe BOGOS: Free Gift Bundle Upsell can handle this well.
With BOGOS, you can set up tiered bundle pricing so customers can mix and match products while automatically receiving discounts as they add more items.
Here’s a demo showing how the bundle could look on your store when using the BOGOS app.
For your custom bundle setup—where customers can choose products freely, receive a discount based on the total number of items in the cart, see a clear progress indicator, and automatically unlock higher discounts as they add more items—our Easify Box Builder app can fully support both the discount logic and the on-page experience, just like the example you shared.
Here’s an example I’ve created so you can see how it works:
Currently, the BB app offers 4 different box types, and for a “buy more, save more” promotion like the one in your screenshot (10%, 15%, 20%, 25% based on quantity), you should use the Tiered Quantity Discount Box. This box type is specifically designed for tiered quantity promotions, where the discount level automatically changes based on the total number of items the customer adds to the bundle.
When using Predefined Box Sizes, you simply create box size options such as 9 Pack, 14 Pack, and 24 Pack, and set the required total number of items for each size. Then, enter a fixed price for each pack, and the system will automatically display the price on each option.
After finishing the configuration, you just need to add your products to the box. Customers will get a Build Your Own Bundle experience exactly like the example you’re looking for— with a clear interface, increasing discounts based on quantity, and the correct discount applied automatically at checkout.
Overall, Easify Box Builder is straightforward and easy to use, enabling even first-time users to complete the setup quickly without any technical knowledge.