# GCD and LCM vs Study Focus Timer

The clearest difference is price: Study Focus Timer at Free against GCD and LCM's $3.99. Study Focus Timer also leads on review sentiment (100% vs 69%) and update cadence (fortnightly vs every 19 months). GCD and LCM's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Study Focus Timer is free to download; GCD and LCM costs $3.99 up front. Study Focus Timer sells 1 in-app purchase, starting at $0.99 per month. GCD and LCM asks for nothing beyond the download.

GCD and LCM ships an update every 19 months, Study Focus Timer fortnightly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | GCD and LCM | Study Focus Timer |
| --- | --- | --- |
| 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 | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 19 months | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 14 MB | 44 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## 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


### Study Focus Timer

[App page](https://appshunter.io/ios/app/study-focus-timer/id1626979957)

This app helps you stay focused during study sessions using customizable timers. It supports the Pomodoro technique and allows for easy arrangement and visual tracking of your work and break intervals. Optimize your learning with flexible timer combinations.

**Highlights:** Pomodoro study timer, Successive timer settings, Interval timer customization, Easy timer rearrangement, Visual elapsed time gauge, List of current study sets

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | per month |


## Frequently asked questions

### Is GCD and LCM free?

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

### Is Study Focus Timer free?

Study Focus Timer is free to download, with in-app purchases available.

### Do GCD and LCM or Study Focus Timer have ads?

Study Focus Timer shows ads; GCD and LCM does not.

### Which is updated more often, GCD and LCM or Study Focus Timer?

GCD and LCM ships an update every 19 months, and Study Focus Timer fortnightly. Most recently, GCD and LCM was updated on November 1, 2026 and Study Focus Timer on November 3, 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.*