You know, like xe.com for BTC. Is it also XE?
You can see the actual market price of bitcoin on different exchanges like Binance. Prices ofcourse varies between different exchanges since there are different trading volumes as well as users.
I'm not sure if google rates for btc/usd pair is live, but I believe it is delayed as it needs info from exchanges.
Just to share,some wallets displays the latest bitcoin value on different exchanges. Like Mycelium.