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?


Cheers.