---
title: "Reliable add to cart on Shopify's newest themes - Sign Customiser Changelog"
description: "Changelog: Reliable add to cart on Shopify's newest themes. Learn about the latest updates and improvements to Sign Customiser."
url: "https://www.signcustomiser.com/changelog/add-to-cart-fix-for-shopify-horizon-themes/"
last_updated: "2026-09-03"
---

Sign Customiser now adds custom signs to the cart correctly on Shopify’s newest theme family — Horizon and Vision, the successors to Dawn. Previously, when a shopper finished designing a sign on a store using one of these themes, the cart drawer wouldn’t open and the sign could be added twice, leaving customers with a doubled quantity and no confirmation that their design had been saved. Both issues are now resolved, so the add-to-cart experience is smooth and accurate across every supported theme.

## What’s Changed

- **Support for Shopify Horizon and Vision themes** - Custom signs now add to the cart and slide open the cart drawer correctly on Shopify’s latest themes, giving shoppers instant confirmation that their design is saved.
- **No more doubled quantities** - A custom sign is now added to the cart exactly once on every theme, so customers always see the correct quantity and price at checkout.
- **Fewer abandoned carts** - With the cart drawer opening every time, shoppers are no longer left wondering whether their order went through, helping more designs make it to checkout.
- **Broader theme compatibility** - We reworked how the cart refreshes across Dawn, custom-built, and other themes so the cart panel always updates reliably without re-adding the product.

## Sitemap

See the full [sitemap](/sitemap.md) for all pages.