This is an outstanding privacy app.
I love being able to use it like I use the "Notes" app on my iPhone...but, with Codebook, everything is securely kept away from prying eyes.
It is a top notch safe vault whether its data base resides on my iPhone, iPad, computer, or in my DropBox account.
Although I found this app easy to use, I did have a couple of questions... for which I had prompt support feedback.
I like the fact that DropBox will sync my Codebook database with all my iOS devices and that Codebook provides a backup provision.
In the future, however, I hope to see a Codebook version which will run on my computer as opposed to just being stored there as a recovery backup.