Tinkercad for the iPad supports any iPad Mini, iPad, or iPad Pro device running iOS 12 or higher.
However, the performance of the Augmented Reality (AR) feature may vary depending on the model of your device. Note that the AR feature uses the camera feed of your iPad, and can require more battery and processing power than the other features in the app.
In general, newer iPads and iPad pros will see the best performance of the AR feature, integrating your design onto a surface in your camera feed. Older iPads and iPad minis may see a degradation of the realtime experience that the newer, more powerful iPads afford.