Mobile apps - Outside of GP

In Google you can use apk file with manual install. In apple you can use provision and manualy add devices but in everytime apple can block your keys*. I think in future Google make something near that. You always can use browser but in any way goverment can block all you doing something wrong*. Say hello Tramp) 

 Say hello Tramp) 

And  you were doing so well until this. 😄  I think the short answer is yes you can install apps outside the app store and google play store.

What we probably need are more feature rich templates so we do not have to rely on either Apple or Google.