Don't think I've ever used an app for my Android. I have the clip-on style.
I had to get the whole kit since a single lens wasn't available at the time.
The main issue for mine was the thickness of the phone affecting the lens staying over the "aperture" of the phone.
The corners/edges of the phone want to push the lens away from the camera.
Here's a couple of images of my macro lens if they help. (I guess even if they don't help. LOL)
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