Posting here as there isn't a general area for it other than an Android or a Apple place .... But feel free to move.
Someone is looking at a tablet. He's looked at apps such as WeChat, Viber, WhatsApp. Under Apple it's listed for iPhone but not iPad. With Google, they tend to give screenshots of a phone and not off a tablet. Can these apps work with an iPad or an Android tablet? Can all Android apps work with the phone and tablets?