SpiralBound is... a note utility modeled after a spiral-bound notepad with organizing, security, and calculator features.
Password Secure: Any page can be rendered unreadable when the program is in the background, has been inactive for a period of time, or whenever the “lock” is clicked. You may choose to require a password to unlock pages, or not.
Easy-to-Use: An easy transition from Stickies: SpiralBound can import your data automatically. Also, automatically update and check-for-update.