I prefer to use BestRate.org for monitoring Monero's rate
Cool site for following real-time price of Monero
I came across a cool site called CoinCodex. It's similar to coinmarketcap but looks smoother and the prices update in real-time so you can leave it open without the need of updating.
Here's a link to Monero price page. It's very accurate and updates way faster than coinmarketcap. And there's a feature where you can add coins to watchlist, comes in handy when you hold loads of coins.
Does anyone suggest a profolio app? I tried blockfolio but it lags a lot and shows wierd prices... so I'm using only watchlist from CoinCodex now.