# Memory Palace Builder vs Mental Math Interview Trainer

The clearest difference is in-app purchases: Mental Math Interview Trainer at none against Memory Palace Builder's 5. Mental Math Interview Trainer also leads on update cadence (every 2 days vs every 3 months). Memory Palace Builder's advantage is iOS requirement (16.0 vs 26.4). On price, ads and device support there is nothing between them.

Both are free to download. Memory Palace Builder sells 5 in-app purchases, starting at $1.39 per month. Mental Math Interview Trainer asks for nothing beyond the download.

Memory Palace Builder ships an update every 3 months, Mental Math Interview Trainer every 2 days. The most recent releases landed on October 11, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Memory Palace Builder | Mental Math Interview Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 2 days** |
| Size | 120 MB | 7 MB |
| Requires iOS | **16.0** | 26.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marvin Perzi](https://appshunter.io/developer/1895391663) | [Ludovic Lepic](https://appshunter.io/developer/1892835258) |

## What reviewers say

### 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 |


### Mental Math Interview Trainer

[App page](https://appshunter.io/ios/app/mental-math-interview-trainer/id6762084410)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Memory Palace Builder free?

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

### Is Mental Math Interview Trainer free?

Mental Math Interview Trainer is free to download, with no in-app purchases.

### Do Memory Palace Builder or Mental Math Interview Trainer have ads?

Both Memory Palace Builder and Mental Math Interview Trainer show ads.

### Which is updated more often, Memory Palace Builder or Mental Math Interview Trainer?

Memory Palace Builder ships an update every 3 months, and Mental Math Interview Trainer every 2 days. Most recently, Memory Palace Builder was updated on October 11, 2026 and Mental Math Interview Trainer on October 19, 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.*