4 min to readLast update on 15 September 2026

Side-by-Side Testing

Side-by-side testing means Custy is installed and set up while your old flow still works. You verify Custy on a controlled path first.

Why test side by side

A live store should not learn about a broken Customize button from customers. Testing first catches missing print areas, wrong prices, and theme issues early.

Safe ways to test

Pick one of these approaches:

1Duplicate theme: embed Custy on a copy and use Shopify theme preview
2Hidden product: set up one product that is not in menus and open its URL yourself
3Password page: test while the storefront is password protected if that fits your launch
4Staff only: use a development store or staff account before production traffic

What to check on every pilot product

Open the product as a shopper would and walk through the full path.

The Customize It button appears on the product page
The Design Lab opens and shows the correct product sides
You can add text and an image inside the print area
Price updates look right when you change options
Add to cart works and the line item looks correct in cart
Checkout completes on a test order when you are ready to verify files
The order shows print-ready artwork for fulfillment

Overview of the Design Lab

Compare against the old app

For each pilot product, compare Custy to what shoppers get today. Sides, sizes, colors, and fees should match your business rules—or be intentionally improved and documented.

When testing is done

If every pilot check passes, move to the Pre-Switch Checklist. If something fails, fix it in Custy or see Troubleshooting before you switch.