Meditation apps have become a huge market. Headspace, Calm, 10% Happier, Insight Timer, and others promise stress relief, better health, and even spiritual contentment to users. Gregory Price Grieve, professor of religion at the University of North Carolina at Greensboro, studies the nexus of spirituality and digital media. He recently published an article titled "Meditation apps might calm you – but miss the point of Buddhist mindfulness."