# Least Common Multiple (LCM) vs WhatDiff

The clearest difference is price: WhatDiff at Free against Least Common Multiple (LCM)'s $0.99. WhatDiff also leads on update cadence (every 5 months vs every 38 months). Least Common Multiple (LCM)'s advantage is in-app purchases (none vs 3) and iOS requirement (14.1 vs 16.4). On ads and device support there is nothing between them.

WhatDiff is free to download; Least Common Multiple (LCM) costs $0.99 up front. WhatDiff sells 3 in-app purchases, starting at $2.99 per month. Least Common Multiple (LCM) asks for nothing beyond the download.

Least Common Multiple (LCM) ships an update every 38 months, WhatDiff every 5 months. The most recent releases landed on September 13, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Least Common Multiple (LCM) | WhatDiff |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 5 months** |
| Size | 0 MB | 2 MB |
| Requires iOS | **14.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [H Valeur](https://appshunter.io/developer/621824042) | [栋 陈](https://appshunter.io/developer/560090281) |

## What reviewers say

### Least Common Multiple (LCM)

[App page](https://appshunter.io/ios/app/least-common-multiple-lcm/id1572012661)

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

**In-app purchases:** none


### WhatDiff

[App page](https://appshunter.io/ios/app/whatdiff/id6762343310)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WhatDiff Month Subscription | $2.99 | per month |
| WhatDiff Annual Subscription | $12.99 | per year |
| WhatDiff Lifetime License | $24.99 | one-time |


## Frequently asked questions

### Is Least Common Multiple (LCM) free?

Least Common Multiple (LCM) costs $0.99, with no in-app purchases.

### Is WhatDiff free?

WhatDiff is free to download, with in-app purchases available.

### Do Least Common Multiple (LCM) or WhatDiff have ads?

Neither Least Common Multiple (LCM) nor WhatDiff shows ads.

### Which is updated more often, Least Common Multiple (LCM) or WhatDiff?

Least Common Multiple (LCM) ships an update every 38 months, and WhatDiff every 5 months. Most recently, Least Common Multiple (LCM) was updated on September 13, 2026 and WhatDiff on September 8, 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.*