Shipping software that feeds your margin, not just your labels

Most shipping tools stop once the label is printed. The interesting part starts there: what that parcel actually cost, and whether the order was still profitable once it did.

Shipping software usually stops once the label is printed. What decides whether the order was profitable is what that parcel actually cost, and whether it arrived when promised. SellerFlow compares what each carrier really charges for that parcel to that destination, picks the lowest cost that still meets the delivery promise, and carries the invoiced cost into that order's margin.

The cheapest carrier that still delivers on time

Picking the lowest rate is easy and occasionally expensive: a cheaper service that misses the promised delivery date costs far more than the few cents it saved, in metrics and in refunds.

SellerFlow compares what each carrier really charges for that parcel to that destination and selects the lowest cost that still meets the delivery promise. Cost is the tiebreaker, not the only criterion.

The real cost goes into that order's margin

This is the part that separates a shipping tool from part of a profit system. Once the carrier invoice arrives, the real cost of that shipment is matched to the order it belongs to. If a parcel cost more than expected, the margin on that order reflects it — no catalogue-wide averages smoothing the loss away.

The same cost is what the repricer uses as the floor under a seller-fulfilled price, so the price you set and the profit you measure come from one number.

Tracking and incidents, without chasing them

Every shipment is tracked and delivery incidents are flagged automatically, which matters most on the orders where the buyer is about to be disappointed and you would otherwise find out from a complaint.

Weight and dimensions decide the real price

Carrier pricing is driven by weight and volume, so the accuracy of that data decides the accuracy of the cost. Where a real weight is not available SellerFlow says so rather than quietly substituting a guess — an honest gap is more useful than a confident wrong number.

Frequently asked questions

How do I know what a shipment really cost me?

From the carrier invoice matched back to the order, not from the rate you expected when you printed the label. The two differ often enough that using the estimate quietly overstates margin on exactly the orders where it went wrong.

Is the cheapest carrier always the right choice?

No. A cheaper service that misses the promised delivery date costs more than it saved, in metrics and in refunds. Cost is the tiebreaker among the carriers that meet the promise, not the only criterion. A missed delivery date also costs on the metrics Amazon uses to decide the featured offer, so the saving can come back as lost Buy Box time.

Does shipping cost affect my prices?

It should, on seller-fulfilled offers. The real delivery cost is part of the floor under the price, so an order that costs more to ship has a higher floor. That is the same number the profit board reports. Using a flat average instead hides the heavy and distant orders inside the light and local ones, which is where seller-fulfilled margin usually leaks.

What happens when a parcel has no real weight on record?

The system says so rather than substituting a guess. Carrier pricing is driven by weight and volume, so an invented weight produces an invented cost, and an honest gap is more useful than a confident wrong number. A deduced weight can be wrong by a multiple rather than by a few percent, and it fails in the direction that looks profitable.

Last updated: 2026-08-19