# GCD and LCM vs HSLU Informatik

The clearest difference is price: HSLU Informatik at Free against GCD and LCM's $3.99. GCD and LCM's advantage is device support (4 vs 1) and iOS requirement (12.0 vs 16.0). On update cadence, ads and in-app purchases there is nothing between them.

HSLU Informatik is free to download; GCD and LCM costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GCD and LCM ships an update every 19 months, HSLU Informatik every 15 months. The most recent releases landed on November 1, 2026 and May 28, 2026 respectively.

## The numbers

| Metric | GCD and LCM | HSLU Informatik |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[2.0 (2 ratings)](https://appshunter.io/ios/app/gcd-and-lcm/id603026694/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 69.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 15 months** |
| Monetization | Paid | — |
| Size | 14 MB | 10 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Hochschule Luzern](https://appshunter.io/developer/690583845) |

## What reviewers say

### GCD and LCM

[App page](https://appshunter.io/ios/app/gcd-and-lcm/id603026694)

This app calculates the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) for up to four numbers. It also provides prime factorization and keeps a history of calculations, which can be emailed.

**Highlights:** Calculates GCD/GCF for 2-4 numbers, Calculates LCM for 2-4 numbers, Finds prime factorization, Stores calculation history, Sends results and history via email, Supports portrait and landscape modes

**Features:** Vision Pro support

**In-app purchases:** none


### HSLU Informatik

[App page](https://appshunter.io/ios/app/hslu-informatik/id1169402052)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GCD and LCM free?

GCD and LCM costs $3.99, with no in-app purchases.

### Is HSLU Informatik free?

HSLU Informatik is free to download, with no in-app purchases.

### Do GCD and LCM or HSLU Informatik have ads?

Neither GCD and LCM nor HSLU Informatik shows ads.

### Which is updated more often, GCD and LCM or HSLU Informatik?

GCD and LCM ships an update every 19 months, and HSLU Informatik every 15 months. Most recently, GCD and LCM was updated on November 1, 2026 and HSLU Informatik on May 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*