It’s common these days to hear of a new mobile game that racks up impressive downloads and sales almost overnight–and then disappears just as fast. A growing raft of gamelike apps hope to stay in your pocket for the long term. How? By offering users the ability to learn a new language, practice web coding or improve their memory. As smartphones become a constant part of the human experience, more and more people are wondering what their phones have done for them lately. So-called brain-training apps propose we spend our downtime bulking up our minds. “There’s a long-term secular trend and consumer interest in health,” explains Kunal Sarkar, the CEO of brain-training company Lumosity. “Taking care of your mind is another part of that.”