How it is reliable to find generic medicine by yourself

HealthKartPlus is really nice app to find out the generic medicine for the medicine you are already using.
Here is the link for the android app :-
<a href="https://play.google.com/store/apps/details?id=com.aranoah.healthkart.plus&hl=en" target="_blank" rel="nofollow noopener noreferrer">TATA 1mg Online Healthcare App - Apps on Google Play</a>

Here my question is how it is reliable to use generic medicine we find on this app?