What word can be used to mean either a website, web app or native mobile app?

I'm running into the comment/question "So, is it an app?"

Well, first it will be a responsive site with some app-like functionality; then later it will also be a native app with the same functionality, plus more... but it will still be the responsive site etc. too.

So what one word or term can I use to describe it now & in the future?