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PackOS Checkout
by PackOS
Show accurate carrier-calculated shipping rates at Shopify checkout. PackOS picks the right box per order and returns live USPS, UPS, and FedEx rates.
5.00(1 reviews)· From $50/month. Free trial available.· Launched May 20, 2026
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Show accurate carrier-calculated shipping rates at Shopify checkout. PackOS picks the right box per order and returns live USPS, UPS, and FedEx rates.
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Data last refreshed Oct 20, 2026. Source: Shopify App Store.