Sellers quietly lose money when buyers pay less for shipping than the label actually costs. A dollar here and two dollars there does not look like much — until it has happened on dozens of orders.
ShipCheck — Buyer-Paid Shipping Shortfall Checker makes that hidden loss visible. It is a single-file tool that runs entirely in your browser: enter what the buyer paid for shipping versus what the label actually cost, and it shows the shortfall per order and your running total — so you can fix your shipping prices before the bleed adds up.
What it does
- Enter buyer-paid shipping and the actual label cost for each order
- See the shortfall per order, instantly
- Track your running total across orders
- Spot underpriced shipping before it eats into your margins
Private by design. No account, nothing uploaded, and your numbers never leave your computer. ShipCheck runs entirely in your browser.
FREE BETA — early release, feedback welcome. Grab it free, run your recent orders through it, and tell us what you find. Your feedback shapes the next version.




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