Is there a website or application which compares price differences across exchanges in real time?

For example 2 weeks ago we saw BCD hundreds of dollars higher on Bittrex or Kucoin (not sure which exchange it was) than it was on Binance leading to a massive increase in price over a day or so on Binance. Could have easily made some quick bucks if you were one of the first to realise.

So does anyone know of anything like this?