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PackOS Checkout
Live shipping rates priced to the right box, not guesswork
by PackOS · Launched: May 2026
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About PackOS Checkout
PackOS solves the problem of inaccurate shipping rates at checkout. When box size is estimated incorrectly, merchants either overcharge customers and lose carts, or undercharge and lose margin. PackOS uses bin-packing logic to determine which box an order actually fits in, then queries live rates from USPS, UPS, FedEx, and other carriers for that specific package. Merchants configure their box inventory once, set their carrier preferences, and PackOS handles the rest automatically at checkout.
Last verified: October 29, 2026 · Fresh
App details
- Developer
- PackOS
- Category
- Orders & shipping
- Pricing
- Paid
- Launched
- May 2026
- Rating
- 5.0 (1) on Shopify
Key features
- 1,000 checkout rate calculations/mo
- Real-time rates at checkout
- Box size library
- Label purchasing
- 90-day margin history
Checkout Shopify Admin
4 plans · 14-day free trial
Starter
$50/month
Basic
$105/month
Growth
$199/month
Pro
$399/month
Plans and prices as listed on the Shopify App Store.
Ratings & reviews
Overview 1 / 1
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