I started API dev with Postman; currently using Insomnia. Three questions: Any particular reason you developed HammerUI? Does it have features not found in other clients? What about GraphQL support?
Lets say I was annoyed by some of the UX/UI features in those tools (but no disrespect, they are great tools). I was also playing around with javafx so I decided to give it a try and create something others can use as well.
The biggest difference for me is that I can work with one project in given instance, and if I want second project, it opens another instance. This is how eg InteliJ Idea is working and I'm heavy Idea user. If someone else likes to organize his work like that, he/she may find HammerUI useful. And of course there are other features...
PS. GraphQL support is coming, just until now I was focusing on getting first release out.