The IGBO CALENDAR APP is a free tool with the main purpose of helping its users to determine the corresponding igbo market day (afọ, nkwọ, eke or orie) of any Gregorian Calendar date within reasonable time period (specifically between 1900 and 2100). The four market days that make up "ofu izu" (one week) in Igbo traditional calendar system are very significant in Igbo communities especially when fixing traditional events and cultural ceremonies. Any Calendar that can assist to determine the Igbo Market Day of a future date becomes handy and an important planning tool. To add fun to using this app, previous versions were developed to resemble the wall calendars we keep in our homes by displaying Igbo-themed beautiful photos. To increase user engagement and interaction, recent versions of the app now includes Igbo Proverbs, Igbo Riddles and Historical Igbo Events and Personalities of note. Most notably, Igbo Riddles come in a game form where users are challenged to provide answers to the riddles; thereby propagating the Igbo Language and Culture.