Simple Calendar is an Android app developed by Simple Mobile Tools (Trieda KVP 1, Košice 040 23, Slovakia). Others apps created by Simple Mobile Tools are: Simple Clock, Simple Contacts, Simple Draw, Simple Flashlight, Simple Gallery, Simple Music Player.

Simple Calendar first became available on 05 Jun 2016. It is estimated that Simple Calendar has been downloaded between 5000000 and 10000000 times from the Play Store.