HideU: Calculator Lock for Android

App snapshot

HideU: Calculator Lock is a free privacy utility for Android by Smart Utils Dev Team (previously released as Calculator Lock: Gallery Vault). The app masquerades as a working calculator but contains a hidden vault where you can store private photos, videos, documents and other files. It aims to make it simple for users to keep sensitive media and apps out of view.

Why a concealed vault is useful

Smartphone cameras produce high-quality photos and videos, and personal media builds up quickly. Items you’d rather keep private — intimate photos, confidential documents, chat backups — can be awkward to manage alongside everyday files. A vault app that looks like an ordinary calculator provides a discreet way to separate and protect that content from prying eyes.

How the app functions

• Use the calculator interface as normal; entering your secret PIN or code opens the hidden storage area.
• Import or move media, documents, and text files into the vault so they no longer appear in other galleries or file managers.
• Optionally lock individual apps (messaging, contacts, file browsers, etc.) behind the same vault for an extra layer of control.
• The user interface is modern and straightforward, making file organization and retrieval easy for most users.

Notable capabilities

• Clean, minimal UI designed for ease of use.
• Secure hiding of photos and videos so they don’t show up elsewhere on the device.
• App-lock feature to restrict access to selected applications.
• Supports multiple file types, including documents and text files.
• Free to download and use (ad-supported).

Limitations to consider

The free version displays advertisements that can interrupt the experience. Ads may appear frequently when switching between apps or when accessing storage, which some users may find intrusive.

Recommendation

If you want a simple, attractive way to hide media and lock apps behind a discreet interface, HideU: Calculator Lock is worth trying. It provides practical protection for private files and apps, though the ad frequency may be a drawback for those seeking an uninterrupted experience.