Yes, LockBox is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
LockBox is free.
To get estimated revenue of LockBox app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
This app has nothing to do with the screenshots and description. Once installed, it asks you to sign up using instagram only. After you log in, it keeps you on a screen to like images or purchase likes. Looks like an instagram like bot imo.
I am only given the option to login with Instagram credentials now. Why, and how do I change this so I can enter my passcode as before?
