There are a few apps that are related to Harry Potter, but they don't allow you to cast spells:
* Harry Potter: Hogwarts Mystery: This is a role-playing game where you create your own wizard/witch and attend Hogwarts.
* Harry Potter: Wizards Unite: This is a location-based augmented reality game where you collect magical creatures and solve puzzles.
* Harry Potter: Puzzles & Spells: This is a matching puzzle game with Harry Potter themes.
If you are looking for an app where you can cast spells, you might want to try an app like "Spell Casting: Magic Simulator". It's a fun app where you can learn about magic spells and cast them in a virtual environment.
Remember that these apps are for entertainment purposes only and do not have any actual magical abilities.