KPPurple
The guidance in this area is very poor but the view being expressed by the Upper Tied Judges is that for an app to be considered it must have been specifically designed to assist a disabled person overcome a specific limitation.
So the app that allows you to determine the colour of your clothing should be treated as an aid, however, Google Maps or similar apps or even navigation devices are not considered to be aids as they are a not designed for the disabled.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems