# calcMod-ProX — modulo calculator

> modulo calculator (iPhone/iPad app by Alain Cardinaux.)

- Source: https://appshunter.io/ios/app/calcmod-prox/id1443066125 (this page in markdown: same URL + `.md`)
- Developer: [Alain Cardinaux](https://appshunter.io/developer/1443066124)
- Category: Education, Productivity
- Price: $0.99
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: English
- Released: 2018-11-22
- Data updated: 2026-07-01
- User reviews in markdown: https://appshunter.io/ios/app/calcmod-prox/id1443066125/reviews.md

## What is calcMod?

What are all the digits of the factorial of 69 and how many digits ?
What is the gogol number ?

How many integers of the form 10^n+1 are prime ? (like 101)

Want to know if a big integer is prime ? The change mod function indicates when the number is prime.

Want to know the divisors of an integer ? A prime divisor has no inverse modulo this integer.

This is a modulo calculator overpowering almost limitless! (only display is limited !)

With modulo gogol, calculus are exact until 100 digits !

The "n!" button calculates the factorial of an integer from 0 to 2000 (v2.0). Factorial are limited to factorial of 2000!

The "change mod" (change modulo) function indicates when the modulo is prime. There are no limit to the modulo except the display.

The "mod gogol" button set a modulo to 10^100 (gogol number).

You can stoke one number and recall it when you want.

The "Mod" operation indicates the residue modulo N.

The exp function allow modular exponentiation (as + - *)

The "INV" function calculates the inverse of an integer modulo N.

This app is intended for both mathematics teachers and/or their students, or if you are interested in the beauty of numbers.

Enjoy calcMod-ProX !

Les commentaires sont disponibles en français (réglages).


## Version history (last 5 releases)

### 2.0 — 2021-11-06

- Text display enhancements for iOS 15 and MacOS Monterey (Truncate for big numbers but minimum character size set)
- Possibility to copy the result to the clipboard by clicking on the display!
- Factorial calculation up to 2000!

### 1.2.1 — 2018-12-05

Fixed a bug linked to Boolean for RCL and aritmetic operations

### 1.2 — 2018-12-03

Fixed a bug of calculation with RCL

### 1.1 — 2018-11-30

Optimization of the code and bug resolution

### 1.0 — 2018-11-21

No release notes.

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## More apps by Alain Cardinaux

- [calcMod-Light](https://appshunter.io/ios/app/calcmod-light/id1445360983)
- [calcMod-Blk](https://appshunter.io/ios/app/calcmod-blk/id1445938178)

All apps by Alain Cardinaux: https://appshunter.io/developer/1443066124

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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 2026-07-01.*