I was looking to find and see if useing this app is work hideing certain images and such. How secure is this app and if it is bad wat is the best app to use to hide it all
Whether you password protect the app is irrelevant. You can access Box from the web. It is as safe as any cloud base storage. I wouldn't keep secure data there.
I use LockPhoto HD to password protect my photos. It is only works with photos though. There are other apps that protect Docs and stuff. Check out this Link for a few ideas.