It is a slightly different concept, you pay once and get code that gives you a uniform interface for communicating with the different carriers (USPS, FedEx, UPS, etc.).
Since it is a one time fee I didn't expect support, however, the developer has been very responsive and helpful whenever I've run into a problem.
I don't know if I'd say it's a "slightly different concept"... EasyPost is an API. RocketShip.it is downloadable software. It's like comparing a Roomba and a vacuum cleaner.
https://rocketship.it/
It is a slightly different concept, you pay once and get code that gives you a uniform interface for communicating with the different carriers (USPS, FedEx, UPS, etc.).
Since it is a one time fee I didn't expect support, however, the developer has been very responsive and helpful whenever I've run into a problem.