Shipping calculator: ShipMagic

After spending thousands on developers to custom generate a solution for mixed carts (containing in-stock/preorder) with multiple shipping rates and complicated logic — Aditya replied on a Shopify forum where I was desperate for a solution. He delivered more than I could have ever asked for.

This app is incredible, and the service behind it is top-notch. Our scenario has been so complicated it took developers months to build an unstable solution, but it took Aditya less than 24 hours to create a custom solution through this application. He took care of the setup, completely understood what we were trying to accomplish and over-delivered.

I was nearly emotional when I saw the result. I can't recommend this enough.