As the co-founder of Delta (https://getdelta.io), it feels natural to recommend Delta. But there are also other good alternatives, as mentioned already like Blockfolio.

Also, if you want a bit simpler way of adding your holdings (just total holdings, instead of per trade), then Cryptonaut is a good solution. You can do it Delta too, but it's a bit more work (you need to switch the Buy Price field from 'per coin' to 'in total').