Creator here. I initially built this as a challenge to myself to make a better signup form. The purpose was to simplify email collection: placing a signup form in an article should be as easy as placing an image. Conversely, subscribing should be as easy as a swipe. I wanted something that looked cool, without being flashy, and also adaptable to different types of websites. This is what came out of it.

A couple of things that you might find pretty cool: - Everyone gets a subscribe.to/brandname URL - Works natively on Medium: just type https://subscribe.to/me and press Enter