On iOS you can customize your DoF with an app called Big Lens.
Normally apps like Instagram and Fotor let you pick one point in the picture or a vertical/horizontal segment and apply focus there while blurring the background. Big Lens is more advanced since it lets you draw with your finger what you'd like to be in focus.
They also include various apertures you can set (as low as f/1.8) as well as some filters -- although I personally find the filters to be overdone but others might find them tasteful.
Normally apps like Instagram and Fotor let you pick one point in the picture or a vertical/horizontal segment and apply focus there while blurring the background. Big Lens is more advanced since it lets you draw with your finger what you'd like to be in focus.
They also include various apertures you can set (as low as f/1.8) as well as some filters -- although I personally find the filters to be overdone but others might find them tasteful.