# XLII vs isPrime?

The clearest difference is iOS requirement: isPrime? at 15.0 against XLII's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

XLII ships an update every 9 months, isPrime? every 16 months. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | XLII | isPrime? |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 16 months |
| Size | 15 MB | 4 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [telethon k.k.](https://appshunter.io/developer/699508003) | [Omer Faruk Mesebuken](https://appshunter.io/developer/1655501999) |

## What reviewers say

### XLII

[App page](https://appshunter.io/ios/app/xlii/id1611293280)

**Features:** Vision Pro support

**In-app purchases:** none


### isPrime?

[App page](https://appshunter.io/ios/app/isprime/id6478832061)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is XLII free?

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

### Is isPrime? free?

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

### Do XLII or isPrime? have ads?

Neither XLII nor isPrime? shows ads.

### Which is updated more often, XLII or isPrime??

XLII ships an update every 9 months, and isPrime? every 16 months. Most recently, XLII was updated on October 30, 2026 and isPrime? on October 25, 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.*