# NumMemorize vs Pi Score Challenge

The clearest difference is in-app purchases: NumMemorize at none against Pi Score Challenge's 1. NumMemorize also leads on iOS requirement (9.0 vs 13.0). Pi Score Challenge's advantage is update cadence (fortnightly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Pi Score Challenge sells 1 one-off in-app purchase. NumMemorize asks for nothing beyond the download.

NumMemorize ships an update every 4 months, Pi Score Challenge fortnightly. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | NumMemorize | Pi Score Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nummemorize/id310151986/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 3 MB | 39 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mahboud Zabetian](https://appshunter.io/developer/310151989) | [Lee Cooper](https://appshunter.io/developer/939505250) |

## What reviewers say

### NumMemorize

[App page](https://appshunter.io/ios/app/nummemorize/id310151986)

This app helps users memorize digits of mathematical constants like pi and e through quizzes. It also allows users to input and memorize their own custom numbers, and offers voice input for convenience.

**Highlights:** Memorize digits of pi, e, and other constants, Quiz yourself on number recall, Input and memorize custom numbers, Voice input for number entry, Practice for math and science students

**Features:** macOS Compatibility

**In-app purchases:** none


### Pi Score Challenge

[App page](https://appshunter.io/ios/app/pi-score-challenge/id6495716223)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Slice of Pie | $5.00 | one-time |


## Frequently asked questions

### Is NumMemorize free?

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

### Is Pi Score Challenge free?

Pi Score Challenge is free to download, with in-app purchases available.

### Do NumMemorize or Pi Score Challenge have ads?

Neither NumMemorize nor Pi Score Challenge shows ads.

### Which is updated more often, NumMemorize or Pi Score Challenge?

NumMemorize ships an update every 4 months, and Pi Score Challenge fortnightly. Most recently, NumMemorize was updated on October 14, 2026 and Pi Score Challenge on October 6, 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.*