I looked at Postwoman a month or so ago, and my honest assessment was "this looks terrible".
So when I saw this and you said it was getting popular, I thought I'd look at it again.
And I looked at the UI. It's like a completely new product. Sure, it doesn't have all the features of Postman (such as documentation generating and their new visualization tool), but it is pretty good.
I'd like to commend you on your product-making abilities, though I probably won't be switching over from Postman at this point.