ShipX ‑ Shipping Rates & Rules

I haven't used any other shipping apps, however this is far more robust than the native shipping options for Shopify. If you are setting up multiple shipping options for lots of products, this is a great app. And the live chat support has been a life-saver when I'm not sure how something works! - Addition: after another year of using ShipX, the customer service and chat is still extremely helpful, not only to understanding the rates in ShipX, but also seeing how they interact with the native Shopify shipping options. Thank you ShipX!