What is the story with ShipRush USPS, is it really free?
Yes. It is completely free. No strings or hidden fees.

So what is the catch?
There is no catch. The QuickBooks community has actively supported ShipRush for over five years. This our way of saying thank you to QuickBooks users. ShipRush USPS prints out the bar coded address label. It does not actually print the postage. You add postage using a postage meter or stamps. There are NO extra fees to use ShipRush USPS. And you get the discounted rate on delivery confirmation

What about the 20-50 cents for USPS Delivery Confirmation?
It costs less with ShipRush! ShipRush USPS gives you the electronic rate for Delivery Confirmation, the cheapest option available! With ShipRush USPS, Delivery Confirmation is free when shipping Priority Mail, and only $0.14 when using other USPS parcel services. (That saves $0.46-$.50 over buying delivery confirmation at the post office.)

Can I use my Zebra label printer?
Yes. ShipRush USPS works with Zebra label printers (like the ZP450 and 2844 models) and with laser and inkjet printers.