Does Add To Cart Anywhere work on Shopify POS (Point of Sale)?
Unfortunately, Add To Cart Anywhere is not compatible with the Shopify Point of Sale (POS) system.
The POS platform is very different from the standard Shopify platform, which makes all code incompatible. Shopify POS apps have to be coded from scratch for that platform.
You can find all Shopify POS apps at https://apps.shopify.com/collections/shopify-pos-apps