# LCM GCD Prime Factor Math vs Memory Palace Builder

The clearest difference is price: Memory Palace Builder at Free against LCM GCD Prime Factor Math's $0.99. Memory Palace Builder also leads on update cadence (every 3 months vs every 18 months). LCM GCD Prime Factor Math's advantage is in-app purchases (none vs 5) and ads (none vs shown). On device support there is nothing between them.

Memory Palace Builder is free to download; LCM GCD Prime Factor Math costs $0.99 up front. Memory Palace Builder sells 5 in-app purchases, starting at $1.39 per month. LCM GCD Prime Factor Math asks for nothing beyond the download.

LCM GCD Prime Factor Math ships an update every 18 months, Memory Palace Builder every 3 months. The most recent releases landed on October 6, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | LCM GCD Prime Factor Math | Memory Palace Builder |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 3 months** |
| Size | 5 MB | 120 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Maria Dolores Garcia Ferre](https://appshunter.io/developer/970100146) | [Marvin Perzi](https://appshunter.io/developer/1895391663) |

## What reviewers say

### LCM GCD Prime Factor Math

[App page](https://appshunter.io/ios/app/lcm-gcd-prime-factor-math/id1488738897)

**Features:** macOS Compatibility

**In-app purchases:** none


### Memory Palace Builder

[App page](https://appshunter.io/ios/app/memory-palace-builder/id6755954161)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium – 1 Month | $1.39 | per month |
| Premium – 1 Year | $14.49 | per year |
| Just Coffee | $0.99 | one-time |
| Pro Version & Coffee | $4.99 | one-time |
| Pro Version! | $28.49 | one-time |


## Frequently asked questions

### Is LCM GCD Prime Factor Math free?

LCM GCD Prime Factor Math costs $0.99, with no in-app purchases.

### Is Memory Palace Builder free?

Memory Palace Builder is free to download, with in-app purchases available.

### Do LCM GCD Prime Factor Math or Memory Palace Builder have ads?

Memory Palace Builder shows ads; LCM GCD Prime Factor Math does not.

### Which is updated more often, LCM GCD Prime Factor Math or Memory Palace Builder?

LCM GCD Prime Factor Math ships an update every 18 months, and Memory Palace Builder every 3 months. Most recently, LCM GCD Prime Factor Math was updated on October 6, 2026 and Memory Palace Builder on September 25, 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.*