When your shipping logic outgrows Shopify's flat rates and weight bands, you hit a wall fast: the native rate engine can't blend rules, can't price by distance, can't react to product tags, and can't hide or rename a carrier rate at checkout. The Shipping Rates & Rules Engine is a build-to-order Shopify app that ECOSIRE designs around your exact rate table, then builds, installs on your store, and supports.

This is not an instant App Store download. After purchase we run a short discovery call to capture your zones, thresholds, carrier accounts and edge cases, then deliver a working app installed on your store.

Under the hood it registers as a Carrier Service via the Admin GraphQL API, so Shopify calls your rules in real time at checkout. Rates are computed from cart weight, destination postcode/zip and country, great-circle or driving distance from your locations, product tags / SKUs, collection membership and cart subtotal — with table rates and rate blending so multiple matching rules combine the way your business actually charges. Free-shipping threshold logic, tiered surcharges, and dimensional / volumetric weight (DIM) pricing are all first-class.

Because checkout post-purchase rate editing needs Shopify Functions or a Checkout UI extension / delivery-customization Function, we implement hide, rename and reorder through the supported delivery-options API — no theme hacks. The app authenticates via OAuth, reads multi-location inventory and metafields for per-product overrides, and listens to webhooks to stay in sync.

You own a clean, store-specific app with a config UI your team can edit — not a generic plugin you bend to fit.