ZombieChat is described as 'When the world goes dark and the cell towers stop working, ZombieChat carries on.
Send and receive text and picture messages to people nearby' and is an app in the Social & Communications category. There are four alternatives to ZombieChat for the Web, Android, Facebook, Facebook Messenger and iPhone. The best alternative is Facechat, which is free. Other great apps like ZombieChat are NickEgo (Free), WorldChat (Free) and Bridgefy (Free).