Advanced Shipping Rate Manager

We sell products via UPS, USPS, and LTL and shipping quotes have always been an issue for our industry until I found ASM. I tested a couple of other shipping apps that were either too basic or no support. ASM has it all for me. Burt and Dan have been so helpful in helping me set up my store. They are even working on a customization just for my needs (at a fee but worth it). This is so far the best company that creates apps for shopify that I have worked with.