ChangeDA is a mobile application that provides information about the currency exchange rates of Algerian dinar against Pound (£), Euro (€), US Dollar ($), and Canadian dollar (C$) in the parallel market at various points in Algiers.

As foreign currency is not available for purchase in banks, the black market has become a dominant force in the Algerian foreign exchange market. The Place du Square Port-Said in Algiers is a reference for this parallel exchange system, and there are several informal exchange offices throughout Algeria, offering services in general food stores, clothing stores, mobile phone shops, and restaurants.

ChangeDA is a useful tool for those who need to stay informed about the exchange rates of the Algerian dinar. However, it should be noted that the rates provided by the app are not official and may not always be accurate.