How to check PX4 drone or not?

Myself, a noob in drone space would like to buy one drone for a hobby project. But I am confused about which one to buy.

I have done Udacity Flying Car Nanodegree and Udacity recommends Bitcraze’s Crazyflie 2.1, to be controlled with Udacidrone API which supports all PX4 drones. Instead I found another drone, JYO 19, in the market, but I am not sure whether it is PX4 or can be controlled with Udacidrone API.

How can I check whether a drone supports PX4 or not?

Hello Anand:

No help here?