Thanks, for asking, Tim.
You can't get in any app-store. It's a research-grade web-application. That is, it runs on our server, you can access it via your mobile, of course, but it is not an app that runs natively on your mobile.
We have designed LiLos user interface to be intuitive to handle for lay-users. We have just started to bet-test it with users from the US
If you would like to join, I'm happy to grant you no-cost access, once you have the respective Withings scale.
I have also contacted Withings with respect to the PWV not being accessible to US users. Once I have their response, I'll let you know.