Is there a way for strangers to contact my child in the app?

No. Hallelu has no chat, comments, messaging or user-generated content of any kind.

What's not in the app

• No way to message, comment or connect with other users.
• No uploads from other people appearing anywhere in your child's experience.
• No autoplay into an open-ended feed — every song and story is part of a fixed, reviewed library, and playback simply ends when the episode does.

Your child can only ever see content that Hallelu itself has published and reviewed — there is no path for outside content or outside people to reach them through the app.