Looks down from my end as well. This isn't the first time this week I've been having issues with Preev either. A few days ago I was trying to look at the price of bitcoin in currencies other than USD, and it just wouldn't load for me, regardless of what network I was on (Wi-Fi or cellular).

Another suggestion for watching the bitcoin price would be Bitcoin Wisdom as well - it gives a lot more information than Preev, plus you can see the prices at various different exchanges.