# π Pi Challenge vs ISC 2026

The clearest difference is in-app purchases: ISC 2026 at none against π Pi Challenge's 1. ISC 2026 also leads on ads (none vs shown). π Pi Challenge's advantage is iOS requirement (13.0 vs 15.0). On price 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. ISC 2026 asks for nothing beyond the download.

## The numbers

| Metric | π Pi Challenge | ISC 2026 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Size | 73 MB | 30 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [SIC Company Limited](https://appshunter.io/developer/1800842356) | [T.R.I., s.r.o.](https://appshunter.io/developer/1001536680) |

## 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 |


### ISC 2026

[App page](https://appshunter.io/ios/app/isc-2026/id6803517958)

**In-app purchases:** none


## Frequently asked questions

### Is π Pi Challenge free?

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

### Is ISC 2026 free?

ISC 2026 is free to download, with no in-app purchases.

### Do π Pi Challenge or ISC 2026 have ads?

π Pi Challenge shows ads; ISC 2026 does not.

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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.*