The updated version of Paper by 53 is out since a bit. I use it on my iPad mini and love it for a little brainstorming, a rough jotting or a quick sketch, hunch or idea.
Once done, I arrange and sort stuff within the app and then send it out to be embedded in my other workflows (e.g. a blog post, OneNote, a Word-document, or a mind map).
The app is free to download and quick and easy to use with any stylus (or just the finger).