Its a 3rd party website created to allow miners to track the mining progress on mph.com :)
Also Ive been doing some reading and it turnes out that mph.com uses PPLNS system to reward miners which means the longer you mine specific coin, the more rewards you get. This makes it not the best choice for auto profit switching but with some tweaks in the settings it should be good. Lets see if its better then NiceHash.