# PiMemory vs π Pi Challenge

The clearest difference is in-app purchases: PiMemory at none against π Pi Challenge's 1. PiMemory also leads on update cadence (fortnightly vs every 2 months). π Pi Challenge's advantage is iOS requirement (13.0 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. π Pi Challenge sells 1 in-app purchase, starting at $0.99 per month. PiMemory asks for nothing beyond the download.

PiMemory ships an update fortnightly, π Pi Challenge every 2 months. The most recent releases landed on March 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | PiMemory | π Pi Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 11 MB | 73 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Younghan Kim](https://appshunter.io/developer/1859100256) | [SIC Company Limited](https://appshunter.io/developer/1800842356) |

## What reviewers say

### PiMemory

[App page](https://appshunter.io/ios/app/pimemory/id6756199880)

**Features:** macOS Compatibility

**In-app purchases:** none


### π Pi Challenge

[App page](https://appshunter.io/ios/app/pi-challenge/id6756227034)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |


## Frequently asked questions

### Is PiMemory free?

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

### Is π Pi Challenge free?

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

### Do PiMemory or π Pi Challenge have ads?

Both PiMemory and π Pi Challenge show ads.

### Which is updated more often, PiMemory or π Pi Challenge?

PiMemory ships an update fortnightly, and π Pi Challenge every 2 months. Most recently, PiMemory was updated on March 19, 2026 and π Pi Challenge on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*