HIP - Hide It Pro

Not safe for kids under 18
Hide It Pro (HIP) is a password-protected secret storage for photos, videos, contacts, notes, passwords, and more.

In-depth breakdown

Minimum Age Requirement
Messaging Capabillities
Location Sharing
Parental Controls
None, though Apple and Android parental controls can be used at the device level.
The purpose of apps like HIP is to create a secret, secure vault for storing sensitive or private information on a mobile device. While there may be good reasons for adults to use an app of this type, it is not recommended for use by children.