Cool, I’ve got some moleskine notebooks at home and I sometimes use them. Especially the ones with dotted pages are great for UI wireframing!
I’m currently using Bear app for Mac and iPhone. I only discovered it recently. I was fighting with indentation issues in Day One, which I used for quite a long time as a typical journal. Had to find something, tested most of the other popular apps and Bear is the one I chose. It’s perfect. It has everything, and nothing else :)