I've been using
https://www.cryptocompare.com for the past months. It suits me because I can create multiple portfolios and see them in different currencies. Another advantage is that I can acces it from both pc and phone.
I'm also using Cryptocompare, their service satisfy my basic needs. I also like that they allow to create multiple portfolios, it helps my to track my coins on different exchanges. It's a website, not an app, so you can access it from your PC, tablet or smartphone. If you are looking for a free tracking tool, I think that Cryptocompare is good enough.