# π Challenge vs Pi Sequence

The clearest difference is in-app purchases: π Challenge at none against Pi Sequence's 1. π Challenge also leads on iOS requirement (13.0 vs 17.0). Pi Sequence's advantage is update cadence (every 3 months vs every 9 months). On price, ads and device support there is nothing between them.

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

π Challenge ships an update every 9 months, Pi Sequence every 3 months. Both last shipped on October 10, 2026.

## The numbers

| Metric | π Challenge | Pi Sequence |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Size | 29 MB | 29 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Warashibe Tech LLC](https://appshunter.io/developer/1567747524) | [晓灵 潘](https://appshunter.io/developer/6781908128) |

## What reviewers say

### π Challenge

[App page](https://appshunter.io/ios/app/challenge/id6743357759)

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

**In-app purchases:** none


### Pi Sequence

[App page](https://appshunter.io/ios/app/pi-sequence-memorize-pi/id6783736734)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $3.99 | one-time |


## Frequently asked questions

### Is π Challenge free?

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

### Is Pi Sequence free?

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

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

Neither π Challenge nor Pi Sequence shows ads.

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

π Challenge ships an update every 9 months, and Pi Sequence every 3 months. Most recently, π Challenge was updated on October 10, 2026 and Pi Sequence on October 10, 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.*