Secret Feature
Calculator with Vault
A working calculator hiding a private media vault
Overview
What if a calculator wasn't just a calculator? This project hides a fully functional private media vault behind an everyday, unassuming utility app.
The Challenge
The app needed to work as a completely convincing, functional calculator first — the vault feature only reveals itself through a specific interaction, and had to stay genuinely hidden from casual use.
Approach
- Built a fully working calculator UI and logic layer as the primary, convincing surface of the app.
- Implemented a password-gated vault accessible only through a deliberate, non-obvious interaction.
- Used client-side storage to keep vault contents private and local to the device.
The Solution
A working calculator app with a genuinely hidden, password-protected vault for private photos and files — privacy-first design disguised as an everyday tool.
Outcome
A fun proof-of-concept that's become a genuinely used utility among friends who wanted a low-key way to keep certain files private on shared or borrowed devices.