eXGo

1) Change currency nation config.

2) Input currency money -> ex) If you bought a 1 dollar by 0.85 euro.

(You can understand below image.)

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If you bought a 1 dollar by 0.85 euro.

1) Indicate that your currency increase or decrease. 

Above image show that you bought a little bit cheap (0.01 cent). 

2) If you bought a cheap price that background color change blue color.

on the other you bought a expensive price that background color change orange color.

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I hope this app help a little bit for you.