In your case you want to create an app because it doesn't already exists or the existing one(s) doesn't match your requirement.
Using something that already exists to help you create another things is not reinventing the wheel, or at least un my mind. Today there is not a lot of peuples who do things totally from scratch, you use something else to support your creation.
Reinventing the wheel is more a fact of "don't mind if there is something like you want to create that already exists".
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In your case you want to create an app because it doesn't already exists or the existing one(s) doesn't match your requirement.
Using something that already exists to help you create another things is not reinventing the wheel, or at least un my mind. Today there is not a lot of peuples who do things totally from scratch, you use something else to support your creation.
Reinventing the wheel is more a fact of "don't mind if there is something like you want to create that already exists".