# ModCalc

> Modular arithmetic calculator for advanced mathematical operations. (iPhone/iPad app by Michal Glet.)

- Source: https://appshunter.io/ios/app/modcalc/id481336029 (this page in markdown: same URL + `.md`)
- Developer: [Michal Glet](https://appshunter.io/developer/481336032)
- Category: Utilities, Education
- Price: $0.99
- Rating: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 1 MB
- Languages: English
- Released: 2011-11-23
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/modcalc/id481336029/reviews.md

## What is ModCalc?

ModCalc is a modular arithmetic calculator. ModCalc supports basic modular operations, modular inversion, modular powering, gcd, lcm,  Jacobi symbol and Solovay-Strassen primality test (30 iterations).

## Key features

- Modular arithmetic operations
- Modular inversion
- Modular powering
- GCD and LCM calculation
- Jacobi symbol
- Solovay-Strassen primality test

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/modcalc/id481336029/reviews.md

### 1/5 — Half the stuff gives the wrong result

*2013-02-12, version 1.3*

Some obvious overflow issues.

## Frequently asked questions about ModCalc

### What mathematical operations does ModCalc support?

ModCalc supports basic modular operations, modular inversion, modular powering, GCD, LCM, the Jacobi symbol, and the Solovay-Strassen primality test.

### How much does ModCalc cost?

ModCalc is a paid application, priced at $0.99.

### What devices is ModCalc available on?

ModCalc is available for iPhone, iPad, and iPod touch devices.

### What is the age rating for ModCalc?

ModCalc has an age rating of 4+.

### When was ModCalc last updated?

The latest version of ModCalc, 1.6, was released on March 8, 2021.

### Does ModCalc have ads?

Based on the provided data, there is no information regarding advertisements for ModCalc. As a paid app, it is generally expected to be ad-free.

### What is the Solovay-Strassen primality test in ModCalc?

The Solovay-Strassen primality test in ModCalc is a probabilistic algorithm used to determine if a number is likely prime, performing 30 iterations for its test.

### What is the user feedback on ModCalc?

ModCalc has received one rating of 1.0 stars, indicating a very low user satisfaction based on the available data.

## Version history (last 5 releases)

### 1.6 — 2021-03-08

Minor changes

### 1.5 — 2018-01-25

Updated compilance with iOS 11.

### 1.4 — 2014-12-18

Added support for iOS 8.

### 1.3 — 2012-02-02

Improved primality testing
Added "remember last" buttons. You can hold down button to remember last result and then you can use remembered value whenever you want. To change remembered value just hold down button once again.

### 1.2 — 2011-12-08

Added Jacobi symbol and Solovay-Strassen primality test (30 iterations).

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## More apps by Michal Glet

- [Spy Cam MG](https://appshunter.io/ios/app/spy-cam-mg/id519621996)

All apps by Michal Glet: https://appshunter.io/developer/481336032

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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.*