Hi, I am the developer of the application. It is interesting to see the concerns of trusting and to be honest I actually understand it very well.
I already discussed it with the members of the TRI-project. And I thought about it during the development on how to solve and ensure a reliable trust level.
I came up with a few ideas, like a trusted entity or open-source. Up to a traffic sniffer for Android.
But every solution to ensure trust has its drawbacks.
For example the trusted entity has to review every damn update of the app. Possibly, but...yeah a lot of work. And then there is the question how far I can trust this person not to keep the code for himself.
Second Open-Source does not ensure trust/security, it improves it but not ensure it. If this would be the case, there would be no coin with a hidden premine or other flaws. The same goes for PoD, I have my own opinion about it.
As you see, I made some thoughts about it and I really understand the concerns, but I did not find the perfect solution.
A last remark, which I wrote also to other users of the app. If I would scam someone, I would simply release the <InsertName>-Coin. This would be by far more easy.
...
Do you guys plan to make the app for other OS?
Possible, but currently not on my plan.
First I will work further on the Android-App itself and improve it.