Spell & Sell
Spell & Sell
November 25, 2025
AOV-Focused Bundling
Real-Time Pricing

How We Built Olavson's Custom Bundle Builder on Shopify

For Olavson, a standard add-to-cart flow could not express the flexibility of building a cookware set. We created a guided bundle builder that lets customers combine eligible products while seeing their selection and pricing update immediately.

The feature behaves like a focused application inside the storefront, but it remains connected to Shopify inventory, cart, and discount logic.

Selection and Constraint State

  • A selection array tracks the exact variants chosen by the customer.
  • Constraint rules enforce valid combinations and quantity limits.
  • Tier state determines the next available incentive and the progress shown in the interface.

Real-Time Pricing With Server-Side Protection

The storefront calculates base price, savings, and progress instantly as products are selected. Clear prompts explain what changes when the customer adds or removes an item.

Shopify Functions enforce the discount logic on the commerce side, keeping final pricing consistent even though the interface responds in real time.

Why It Works

The builder turns bundle configuration into a guided decision instead of a spreadsheet of variants. Customers retain control, inventory rules remain explicit, and incentives are visible at the moment they matter.

See it here