This is awesome.  Looks nice, works well, easy to use.  One problem that I have with it is that my portfolio changes all the time.  Either I'm using some of my crypto, or trading it, or whatever.  What I was wondering is, instead of entering a type of currency and an amount, could you enter a type of currency and an address?  Then it could track for you how much belongs to that address.

Unless I'm understanding the way the block explorers work, I thought you could know how much currency there is in any address.  Maybe this won't work, but it sure would be cool.