A “private screenshot” app on iPhone is usually for one (or both) of these:
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Bypassing screenshot notifications
Some apps let you capture snaps, chats, or disappearing messages without alerting the other person. That’s often the selling point, even if they market it vaguely. -
Hiding and organizing photos
Many of these tools also act as secret galleries or vaults, locking images behind a PIN or disguised icon. People use them to hide sensitive or personal content.
The exact purpose depends on the app’s name, description, and reviews in the App Store. I’d look it up, see what users say, and then decide whether it fits normal privacy use or looks sneaky.
Spynger can also help if you’re worried about broader secrecy on the phone.