# π Pi Challenge vs Sorobaco

The clearest difference is ads: Sorobaco at none against π Pi Challenge's shown. π Pi Challenge's advantage is iOS requirement (13.0 vs 26.2). 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 Sorobaco 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, Sorobaco every 3 months. The most recent releases landed on October 5, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | π Pi Challenge | Sorobaco |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 73 MB | 1 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [SIC Company Limited](https://appshunter.io/developer/1800842356) | [Mercurio Solutions](https://appshunter.io/developer/1857594853) |

## 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 |


### Sorobaco

[App page](https://appshunter.io/ios/app/sorobaco-soroban-mental-math/id6760806680)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Sorobaco | $1.99 | one-time |


## Frequently asked questions

### Is π Pi Challenge free?

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

### Is Sorobaco free?

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

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

π Pi Challenge shows ads; Sorobaco does not.

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

π Pi Challenge ships an update every 2 months, and Sorobaco every 3 months. Most recently, π Pi Challenge was updated on October 5, 2026 and Sorobaco on October 17, 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.*