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what does it do?
"A comprehensive image management, tagging, and syncing system, all automated
Do you have a huge folder of anime images, with no hope of ever finding anything in it? Do you want to be able to access this folder across machines and on your phone? If so, you've come to the right place! With auto-tagging powered by DeepDanbooru, image organization bliss is one batch upload away. If you have multiple computers you use + a phone and want to access your image library everywhere, or are just a homelabber, the server is for you."
I don't have iPhone so can't confirm, but that's the app description
Why is it called Femboy?
Given that it's a tool to find anime pics, that's probably the name of the category it's trained to detect. I think it's "getting" that specifically trained AI as a module, not getting an app.