Miitomo was a freemium mobile app developed by Nintendo and launched on the 17th of March. It closed down on the 9th of May 2018 due to a lack of users. Similar to Tomodachi Life, you make a Mii that lives in a room and can interact with other Miis. You can also buy clothes for your Mii to wear with Miitomo coins. Unlike Tomodachi Life, you meet Miis from other people online instead of via StreetPass. There is a Miitomo Wiki.