ShipGrid

ShipGrid helps merchants upload carrier Excel rate tables to calculate accurate multi-zone shipping rates with weight tiers at checkout. Connect multiple carriers to your Shopify locations and apply tag-based filtering to control which rates appear. Add surcharges or discounts as needed, and handle mixed-cart scenarios with automatic per-item supplements when small items ship alongside larger orders. The built-in rate tester simulates real carts to show exactly which carriers activate and why. Rate History logs every checkout request with full trace details for easy troubleshooting. Perfect for merchants managing complex shipping rules across different zones, locations, and product combinations.