ShipStation

We've been using ShipStation for several years and the integration with Shopify is seamless. The app has robust features that scale easily based off the size of your business. It is easy to comparing shipping rates for companies like USPS, FedEx, DHL and UPS. The automation tools are robust and allow for ease when customizing a specific workflow down the employee level. After 6 years of using this product our only complaint is that users are still not able to automate package sets on shipments with multiple packages.