HideX is a top-tier privacy tool disguised as a fully functional calculator. To the casual observer, it’s just a math app, but entering a secret PIN on the keypad unlocks a hidden vault for photos, videos, and private apps.
Go to Settings > Security (or Privacy) and toggle on "Install from Unknown Sources" so your phone accepts the APK file.
The modified version of HideX often unlocks "VIP" or "Pro" features that are typically locked behind a paywall in the standard version:
Built-in incognito browsing that automatically clears history and cookies. How to Download and Install