calc+

calc+ is a secret photo vault and calculator lock app for iOS and Android. It looks and works like an ordinary calculator — but entering your secret PIN unlocks a fully encrypted private vault for storing photos, videos, documents, notes, contacts, and passwords. All hidden behind a PIN that only you know.

When you open the app, you see a functional calculator. Entering your secret PIN unlocks your hidden photo vault. To anyone else, it’s just a calculator app.

Features

Calculator App That Hides Photos

Store your most private photos and videos in a calculator with a hidden folder that’s completely invisible from the outside. There’s no vault icon, no obvious entry point — just a working calculator.

• App opens as a working calculator
• Enter your vault PIN to unlock — no vault icon, no obvious entry point
• Multiple independent vaults, each with its own PIN

Encrypted Photo Storage

Your encrypted photo storage uses military-grade encryption so your files are protected even if your device is compromised.

• All files encrypted with AES-256-GCM before being written to disk
• Keys derived using PBKDF2-SHA256 (100,000 iterations) with a unique salt per vault
• App-level pepper stored in the device’s secure enclave
• Encrypted files stored with UUID-based filenames — no original names on disk

Private Photo Vault — What You Can Store

Use calc+ as your private video vault and photo safe — import anything sensitive and keep it completely off your main photo library.

• Photos — import from your photo library; originals can be deleted after import
• Videos — import and store securely with thumbnail previews
• Documents — store PDFs and other files
• Notes — private text notes with title and content
• Contacts — store sensitive contacts separately from your device contacts
• Passwords — store credentials with service, username, password, URL, and notes

Security Features

calc+ doubles as a decoy app for photos — to anyone without your PIN, it’s an ordinary calculator with no hint of a hidden vault beneath it.

• Intruder Detection — silently captures a photo using the front camera after failed unlock attempts
• Break-in Logging — records timestamps and entered digits for failed attempts
• Auto-Lock Timeout — configures how quickly the app locks when sent to the background
• Screen Capture Prevention — blocks screenshots and screen recordings while the app is open
• Decoy Vaults — create a vault with harmless content shown under duress; indistinguishable from a real vault

Privacy

calc+ is a fully offline hidden vault app — no accounts, no cloud, no tracking. Your files never leave your device.

• No network requests — fully offline
• No analytics, no tracking, no cloud sync
• All data stays on your device
• Factory Reset option permanently wipes all vaults, keys, and logs

The Best App to Hide Pictures

calc+ is a private photo vault built for people who take their privacy seriously. As the best app to hide pictures on iPhone and Android, it gives you a secret vault app that looks and acts exactly like a real calculator — so your hidden photos stay hidden, no matter who picks up your phone.