I disagree with the "yet another" comment because the more high-quality choices there are out there the better. I think this looks like a promising product and, if nothing else, is a great way to see what the market wants because they will be able to make faster changes than someone like Evernote can.
http://www.reddit.com/r/IAmA/comments/1hxzad/we_are_the_micr...
The aim is simply to have your notes at hand, and then you just press ⌘3 to switch to your passwords if you need to generate a new one or login to some website.
(By the way, thanks for checking out my app!)
Everyone makes their own productivity app because everyone has their own style of time/task/goal management. Do we not always say something along the lines of, "build something for which you're the first customer?"
This is the most common result of that stimulus.
I often encourage people who are just starting to program to make their own CLI productivity app that mirrors their existing GUI or paper productivity system. It gives them both the motivation to complete it and a reason to keep coming back to the command line after they're done. I wish that more introductory language and framework tutorials were structured around this.