Update: chAnQya app is available on Google Play Store since 3 August 2019. Please download from this link: https://play.google.com/store/apps/details?id=com.ashokdhamija.chanqya.
I have replied to a similar question - When Chanqya android app will release?
As mentioned in that reply, at present, the first priority is to add more features in chAnQya.com that was released just about two days back (17 July 2019). There are many more features that are to be implemented one by one.
Moreover, even at present, chAnQya.com works on desktop, laptop, tabs, and smartphones of all different sizes since this website uses a responsive design. Therefore, the website is clearly visible even on the small size smartphones.
May be after a month or so, by which time I hope to add most new required features, I may think of developing an app for chAnQya.com for Android. This is an approximate guess.
But, as I mentioned above, even today, this website can be used fully from Android smartphones. So, please try to explore chanqya.com from your Android smartphone. It should work perfectly.