Carbon is one of the best if not the best life counter app there is. It's very sleek and looks futuristic, and the interface is simple. You can also add other counters aside from life which will appear beside your life total like poison, mana, and energy. Maximum 4 players. Give it a try!
https://play.google.com/store/apps/details?id=com.getcarbonapp.carbonv4
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