Apposture will help protect your posture in a very clever way, without the need to wear straps or posture correcting clothing.
It works simply by turning off the screen when you are not holding up your neck straight. This will cause a natural correction by you, in lifting your smartphone up and consequently your neck, bringing the screen image back.
Because there is nothing to wear, it works great to protect your children's necks too. Additionally it has a password option so that they wont try to turn off the app. ;)