Tbh just look at houses in e.g. Luebeck, Germany or other old european cities. Some houses still in use have their foundation over 700 years ago and even survived 2 WWs. So, there you go -> thats how to build.
THIS is basically what I feel is the reason why most german software companies are lacking success in international competition...
Disclaimer: I'm german, have software engineering degree and hate german conservative company structures not adapting to the 21st century...
There's also some (currently) free cloud version by microsoft available on https://notebooks.azure.com in a preview state, but works great already. (Tested python3 only)
To be honest I guess it's most likely a combiation of their bing speech and vision apis, so as there are android sdks for all of them, you could easily reproduce this as an android app.