Searching that list / note taking app

Hey there,

some time ago, a fellow indie hacker posted an app that looked like a simple text doc - you could add some simple ordered / unordered list, linking each item to a new doc. You then would get some kind of tree hierarchy list collection. I remember that the landing page was pretty simple, offering as good as no information ;-)

Anyone remembering this? Forgot to bookmark this...

Cheers, Sebastian