By far the best one out there is still https://cointracking.info . It is not just a coin portfolio management website which it is but it also connects to your exchanges via api (only read is enough) and follows your moves so you do not have to manually do anything, from your trades to your profits to losses you can see everything there, it is really detailed and it is automated so it makes you not work for anything at all. It is not free (well there is a small free demo but its not really worth it) but it really deserves the money it gets.

Also for Americans they help you with calculating your taxes, since it can check all the moves you made in crypto via their API they just tell you how you can file for your tax and pay them and how much etc etc, it really helps the Americans as far as I know but I am not american so never used it myself.