# π Pi Challenge vs Pi Sequence

The clearest difference is ads: Pi Sequence at none against π Pi Challenge's shown. π Pi Challenge's advantage is iOS requirement (13.0 vs 17.0). On price, update cadence, in-app purchases 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 and Pi Sequence sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

π Pi Challenge ships an update every 2 months, Pi Sequence every 3 months. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | π Pi Challenge | Pi Sequence |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 73 MB | 29 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SIC Company Limited](https://appshunter.io/developer/1800842356) | [晓灵 潘](https://appshunter.io/developer/6781908128) |

## What reviewers say

### 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 |


### 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 Pi Challenge free?

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

### Is Pi Sequence free?

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

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

π Pi Challenge shows ads; Pi Sequence does not.

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

π Pi Challenge ships an update every 2 months, and Pi Sequence every 3 months. Most recently, π Pi Challenge was updated on September 18, 2026 and Pi Sequence on September 24, 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.*