Free, Password-locked Photos Android/iOS App
A simple app that lets you add photos to the app, and optionally organize them in albums. Many apps out there like this, but this one will be different; You won't get any limits on how many pictures you can store, and albums you can have. You can watch sponsored videos to unlock it!
You start with 30 photo slots. To add more, just watch a video, and you'll get 20 more. Same with albums, but you start with 1, and get 1 more per video you watch. The app also displays a banner ad all the time. You can remove the ads for a dollar, tho :)