# The Memory Matrix vs Sum

The clearest difference is update cadence: Sum at weekly against The Memory Matrix's every 3 weeks. The Memory Matrix's advantage is iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

The Memory Matrix ships an update every 3 weeks, Sum weekly. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | The Memory Matrix | Sum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/sum-squares/id6751417676/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | — | Free |
| Size | 83 MB | 28 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [玥 高](https://appshunter.io/developer/1635812127) | [Allen Kagle](https://appshunter.io/developer/1834971754) |

## What reviewers say

### The Memory Matrix

[App page](https://appshunter.io/ios/app/the-memory-matrix/id6741984305)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sum

[App page](https://appshunter.io/ios/app/sum-squares/id6751417676)

A logic puzzle game where players fill in missing squares to match row and column totals. It offers various modes like Standard, Time Attack, and Grid Blitz, suitable for casual play or skill sharpening.

**Highlights:** Fill missing squares to match totals, Standard mode with adjustable difficulty, Time Attack mode against the clock, Grid Blitz mode for speed and accuracy, Sharpen quick addition skills, Suitable for all ages

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The Memory Matrix free?

The Memory Matrix is free to download, with no in-app purchases.

### Is Sum free?

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

### Do The Memory Matrix or Sum have ads?

Neither The Memory Matrix nor Sum shows ads.

### Which is updated more often, The Memory Matrix or Sum?

The Memory Matrix ships an update every 3 weeks, and Sum weekly. Most recently, The Memory Matrix was updated on October 25, 2026 and Sum on November 5, 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.*