Cart Transform vs Shopify Scripts — which for personalization pricing?
Shopify Scripts (Ruby-based, Plus-only checkout customization) is being replaced by Shopify Functions (WebAssembly-based) with Cart Transform as one of the function types. For any new personalization pricing work in 2026, use Cart Transform via a product options app like Print It My Way. If you have legacy Scripts, plan migration — Shopify has announced Scripts deprecation.
Step-by-step setup
- Audit your current Scripts. Which surcharges live in Scripts?
- Rebuild in Cart Transform. Modern API, cleaner semantics.
- Test in dev store first. Verify parity before switching production.
What Shopify Scripts is
Ruby scripts running on Shopify's servers at checkout — historically Plus-only. Used for line-item price customization, discount stacking, shipping rate customization. Being deprecated in favor of Shopify Functions.
What Cart Transform is
A Shopify Function type that modifies cart lines: add surcharges, expand bundles, calculate dynamic prices — all without variant explosion. Runs in a WebAssembly sandbox. Faster and cleaner than Scripts.
Migration path
- Audit which Scripts you have that touch line items
- Rebuild each as a Cart Transform function (via app or custom Function)
- Test in a development store
- Enable Cart Transform on production, disable the equivalent Script
- Monitor for a billing cycle
Print It My Way handles it
Print It My Way uses Cart Transform natively for per-character pricing, upcharges, and gift-wrap fees. No Scripts needed, no custom Functions to write. Included on every tier.
Modern pricing without Scripts
Print It My Way's Cart Transform is built in on every tier.
Install Print It My Way — Free Cart Transform vs variant pricing →Frequently asked questions
Are Shopify Scripts still supported?
They're being deprecated in favor of Shopify Functions. Migrate away from Scripts before the sunset date.
Do I need to write custom Functions?
No if you use a product options app like Print It My Way — Cart Transform is included.
Is Cart Transform Plus-only?
Base API is Plus. Non-Plus stores use an equivalent mechanism via app-side logic.
What replaces Scripts for shipping rate customization?
Delivery Customization Function (a separate Shopify Function type).
When does Scripts sunset?
Shopify has announced deprecation; check the current Shopify Changelog for the exact sunset date.