Domain and additional account name checking website

Hi folks,

some time ago, I found an awesome website, where you could enter your potential name idea and it would check domain availability and additionally check if that name was free on Facebook, Twitter, Instagram and so on.

But, ffs, I just can't find that site anymore. Must have lost that link or never saved it properly.

Does anybody here know what I am talking about? If so, please point me into the right directon!

May be one of these?

namecheckr.com
knowem.com
namechecklist.com

It's not among these three, but they will suffice. Thanks a bunch!