Obviously it's possible to track with a graph on an exchange the performance of a single coin over time. Is there a site I can use to input the amounts of all of my coins in my exchange portfolio and get a their aggregate values graphed over time?

This has to exist. Thought I'd ask here so I could get a recommendation of the best site. Preferably one that saves my details so I don't have to input every time I need this data and allows me to login to an account.

I'm surprised this doesn't already exist of either Bitrex or Poloniex. They only have a snapshot of the current valuation of all of your coins.

Thanks in advance.
rich0292