Doviz&Altın is a free and easy to use currency converter with real time exchange rates.
Doviz&Altin app are serving international parities, foreign currency and gold values of street market.
Also historical datas of CBRT(Central Bank of the Republic of Turkey) could be accessible. The application also offers currency converter, charts and accounts menu. By the help of accounts menu, you can define your individual foreign currency accounts and see if you gain or loss.