I'm using livecoinwatch.com a lot. More information and the possibility to built up a portfolio. But it's also kinda buggy.
So, I'm still looking for the perfect solution. Which site or app are you guys using to keep track of your portfolio?
Just use coinmarketcap, there you can find all of the information that you need on a coin not just the present value, you can look at the charts for the coin and you can get to know the volume of the coins in circulation and it gives you all of the price information that you need to know about the coin that you are looking up. That is what I use to track the value of coins