Currency Strength Indicator?

Trading Tech and Tools
1

Hi,

I’ve read the book of Anna Coulling, and saw that she uses some type of currency strength indicator. It seems to be a reliable way to watch market for possible breakouts. I found two in my research;

  1. Apollo Currency Strength Meter

  2. Quantum Currency Strength Meter

I would appreciate any insights regarding to reliability of these products or any other alternatives.

Thanks.