Pretty good...
There are minor issues. Frequent ads arent much of a worry, but sometimes ya need a bit more security than a 4 digit code or a connect the dot picture! (Edit: really not too bad though)Suggestions: Add a option to make the app look normal or in disguise. And 8. Digit codes, or another code to go along with extremely private secrets including ones that cant be seen unless you touch it. My final thing that I most suggest to add is to change from a email alert from someone breaking in to a snap of a photo to put in your private photos. Still a OK app. Secure enough but a little polishing would improve it.
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My Private Journal: Free Secret Photo, Video, & Journal Manager