Check out these apps if you do buy an iPad:

[1] Infinite Painter

https://infinitestudio.art/painter.php

[2] Procreate

https://procreate.art/

[3] Notability

https://notability.com/

[4] Pushover real-time notifications

https://pushover.net/

[5] Shapr3D 3D-modelling

https://www.shapr3d.com/