Create sophisticated shipping rules that make complex decisions automatically. Set up conditional logic based on weight, dimensions, destination, customer type, and more to remove the repetitive manual decisions your team makes on every order. A single rule can right-size the box, rate-shop for the lowest-cost eligible service, generate a compliant packing slip, and sync the result to your other tools through integrations.
This rule engine was built inside the founder's own operation — a 1,000–2,000-order-a-day ShipStation account where every decision below was somebody's manual job.
Rules you can build
The figures below come from the operation ShipExtension was built inside — not projections.
Figures from PPC International, the founder's own operation — no extrapolation. *Rate-shopping savings measured against orders shipped without rate shopping; if you already pay for ShipStation's built-in rate-shopping tier, expect less.
From connected account to automated orders in three steps
ShipExtension links to ShipStation over its API and reads your orders, stores, tags, and products — no change to your setup.
Set conditions — customer, product, destination, tag, even destination weather — and the actions that follow. Chain as many as you need.
Rules run on a schedule, across bulk batches, or in real time via webhook, writing every change straight back to ShipStation.
Automating a shipping decision
ShipStation
Static if-this-then-that rules, limited to the data ShipStation already stores
ShipExtension
Chained, conditional rules that react to weather and other external data and run on a schedule or webhook
ShipStation automation rules FAQ
Start creating intelligent automation rules that handle complex shipping logic