Garden design software ant ideas?

hi all I want to design the layout of my terrace for next year. Hopefully making it a bit less haphazard.
I had a crazy brainwave that I could design something using my iPad.....but of course can’t find any software that does not need you to take photos of the empty space.
any ideas or experience?
I had a crazy brainwave that I could design something using my iPad.....but of course can’t find any software that does not need you to take photos of the empty space.
any ideas or experience?
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not sure if available on apple