# ExtraCalc - Hidden File Vault — Calculator & File-Vault

> Calculator with a secret, secure vault for private media. (iPhone/iPad app by Uli Prantz.)

- Source: https://appshunter.io/ios/app/extracalc-hidden-file-vault/id1507454213 (this page in markdown: same URL + `.md`)
- Developer: [Uli Prantz](https://appshunter.io/developer/1477382243)
- Category: Utilities, Photo & Video
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 54 MB
- Languages: English
- Released: 2020-04-15
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/extracalc-hidden-file-vault/id1507454213/reviews.md

## What is ExtraCalc?

ExtraCalc has many functionalities such as matrix calculation and other scientific calculation modes. Besides that if you enter your very own mathematical expression your hidden gallery opens. This way you can store and hide your most important images and videos and nobody can delete, edit or see your photos and videos except you. The best thing is that people don't even know if you're hiding something or not. The perfect alternative to hidden folders or other ways to hide your secrets.

## Key features

- Scientific calculator functions
- Matrix calculation
- Hidden gallery for photos and videos
- Secure media storage
- Disguised interface

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/extracalc-hidden-file-vault/id1507454213/reviews.md

### 5/5 — One question

*2021-05-08*

The one question I have is how do you change your password

## Frequently asked questions about ExtraCalc

### What is ExtraCalc?

ExtraCalc is a utility app that functions as a scientific calculator and also provides a secure hidden vault for your private photos and videos. You can access the hidden gallery by entering a unique mathematical expression.

### How do I access the hidden gallery in ExtraCalc?

To access your hidden gallery in ExtraCalc, you need to enter your very own mathematical expression into the calculator interface. This unique expression will unlock and reveal your stored images and videos.

### Can others tell that I am hiding files with ExtraCalc?

No, the app is designed to look like a regular calculator. People won't even know you're hiding something, making it a perfect alternative to standard hidden folders or other methods.

### What kind of calculations can ExtraCalc perform?

ExtraCalc offers various functionalities, including matrix calculation and other scientific calculation modes. You can also enter your own mathematical expressions.

### Is ExtraCalc available on Android devices?

Based on the provided data, ExtraCalc is currently supported on iPhone and iPod devices. Information regarding Android availability is not specified.

### How often is ExtraCalc updated?

The latest version of ExtraCalc is 1.0.1, and it was last updated on April 15, 2020. This indicates that updates may not be very frequent.

### What is the age rating for ExtraCalc?

ExtraCalc has an age rating of 4+, making it suitable for a wide range of users. This rating suggests it contains no mature content.

### Does ExtraCalc have ads?

No, the provided data indicates that ExtraCalc does not contain advertisements. It is a completely ad-free experience.

## Version history (last 1 release)

### 1.0.1 — 2020-04-15

No release notes.

## More apps by Uli Prantz

- [Mirai: AI Journal & Coach](https://appshunter.io/ios/app/mirai-ai-journal-and-coach/id6747045716)

All apps by Uli Prantz: https://appshunter.io/developer/1477382243

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*