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One of the easiest and simplest crypto portfolio managers out there is the CoinHodler. Great interface and easy to use. They have inbuild coin exchange as well, using Shapeshift. Try it out. It's free.
Set it up in 3 easy steps:
Go to the website - https://coinhodler.io/
Name your portfolio
Click Create Portfolio
You are done.
Before leaving the page, do not forget to backup your passphrase in order to access the portfolio next time.
Enjoy!