Is there any website, which allows to choose few exchanges like Poloniex and Cryptopia and see all those exchanges Bitcoin price chart in one chart or show multiple small charts which can fit to one browser window so each can be seen same time?
http://cryptrader.com/ may be what you are looking for. I used to use it and I like how it works when it does (sometimes, rarely, it has bad days too).
PS. It's not my site.