Swapnote, known as Nintendo Letter Box in PAL regions and Itsu no Ma ni Kōkan Nikki (いつの間に交換日記) in Japan, is a messaging application for the Nintendo 3DS family. Swapnote was released on December 22, 2011 in Europe, Australia and North America via the Nintendo eShop, and can be downloaded at no additional cost, and is pre-installed on newer systems. Swapnote is the successor to the PictoChat app for the Nintendo DS family.