I don't like that this needs your phone to be rooted. That is going to keep it from ever becoming ubiquitous. The solution? I don't know, but I suspect that

I don't like that this needs your phone to be rooted. That is going to keep it from ever becoming ubiquitous. The solution? I don't know, but I suspect that Wi-Fi Direct, which both apple and android now support, would enable complete functionality without rooting. Can the author comment on why they are not using Wi-Fi Direct? Is it because older phones do not support it? If so, perhaps let it support either rooting or Wi-Fi Direct. I'm a techie, and I don't want to root my phone, and definitely not my wife's phones, just so I can play with this. If I won't, a lot of other people, especially non techies, won't either. You need the non-techies to get critical mass.