In all honesty, I had never heard about it before either, but my friend saw it mentioned on an IRC channel.. Either way, I have the answer to my question, feel free to close thread if you like. ty everyone.
Thanks kerokero, to be honest I mainly want to use it as you can minimize the information window, which for me saves a lot of time from switching between windows or having to keep going from small to full screen when reading quests guides and so on.
As I'm new here I'm reluctant to post the address of the website, but a friend uses this site to play RS, it looks legit from what I can see, seems like an online swiftkit.. is it safe to use ?