MarginShip creates an automatic free-shipping rule that evaluates discounted cart subtotal, delivery cost, and existing discounts before applying a benefit. Set an optional order threshold, shipping-cost ratio, product or collection exclusions, and a 15% combined promotional cap. Buyer-facing cart messages are customizable in every plan. Growth adds simulation with Shopify-returned rates; Scale adds an auditable decision trace. Checkout remains authoritative.

• Protect margin with a configurable combined promotional-benefit cap.
• Exclude selected products or collections from free-shipping eligibility.
• Show customizable cart progress and status messages in every plan.
• Simulate eligibility with Shopify-returned rates on Growth and Scale.
• Audit shipping decisions with additional diagnostics on Scale.