A merchant asks which shipping app to install. The right answer depends entirely on which of four different problems they have, and they're usually not the same problem they described.
The four categories:
- Rate calculation — what the customer sees and pays at checkout. A conversion and margin problem.
- Labels and fulfillment — how orders get processed and out the door. A throughput problem.
- Tracking and post-purchase — what happens between dispatch and delivery. A support-load problem.
- Returns — what comes back and what it costs you. A margin and retention problem.
These don't overlap much. An app that prints labels beautifully does nothing for cart abandonment caused by a surprise $18 shipping charge. A branded tracking page won't help a team drowning in manual fulfillment.
So work out which one you're solving. If customers abandon at the shipping step, you have a rate problem. If your team can't get orders out fast enough, a fulfillment problem. If support is full of "where's my order," a tracking problem. If returns are eating margin, a returns problem.
One more thing first: if you're using a 3PL, you need fewer of these than you think. Your provider handles labels and fulfillment, so buying a fulfillment app duplicates what you're already paying for — covered in how to choose a 3PL.
App pricing and features change frequently and most vendors price by order volume. Confirm current details directly.




