Simple, yet powerful currency app.

Highlight:
- Built-in calculator
- Historical exchange rates
- Offline support
- Conversion on widget

Tips:
1. Tap the base currency area to activate keyboard
2. Scroll the list to hide keyboard
3. Tap any currency on the list to set it as base currency
4. Tap and hold, and then drag to reorder
5. Swipe left to delete currency
6. Swipe left to view historical currency rates as well
7. Pull down to refresh
8. Swipe left/right on top currency area to delete last input

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