Are photo lock apps trusted? (iPhone application)?

I want to store family photos and some embarrassing memories in a private photo lock app.
I heard "ePhotoChest" is good photo lock application on iPhone.
But are these photo lock apps to be trusted?
Can they steal your private pictures since they made the app?
Or is it safe to use?
Explain please, I'm really curious

Well I actually use a password manager that can also store images. I think if you pay attention to the type of encryption you can be sure that your images will not be stolen. AES-256 is very strong. If you want to know which one I use, it is called Safe.

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