Some apps are easier to use than others thanks to their UI design. Some utilities are more complex than others depending on the app. For example Vsco has a UI design a lot more complex than Snapchat. Both apps are created for sharing photos but definitely Snapchat has simpler way of sharing them. You just take the picture, choose to whom to send it and click send while when using Vsco you take the picture and have the facility of editing it in a lot different ways then share it with anyone in the world.