ChangeDA is a Mobile Application that collects currency exchange rate information US Dollar ($), Euro (€), Pound (£), and the Canadian dollar (C $) against the Algerian dinar at the parallel market in several points in Algiers.

The Algerian case is very singular in the foreign exchange market, as the foreign currency is not available for purchase in the banks in the absence of bureaux de change, which allowed the proliferation of operations on the black market to a rate that does not meet any monetary rules.

The Place du Square Port-Said in Algiers is a reference for this parallel exchange system which dominates the market in addition to several informal exchange offices known to Algerians. Services offered in general food stores, Sale of clothing, mobile telephony, and restaurants throughout the Algerian territory.