# isPrime? vs Pixel Clock

The clearest difference is update cadence: isPrime? at daily against Pixel Clock's every 6 days. On price, ads, in-app purchases and device support there is nothing between them.

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

isPrime? ships an update daily, Pixel Clock every 6 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | isPrime? | Pixel Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 6 days |
| Size | 0 MB | 79 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Omer Faruk Mesebuken](https://appshunter.io/developer/1655501999) | [YIMING SHI](https://appshunter.io/developer/1778404172) |

## What reviewers say

### isPrime?

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Pixel Clock

[App page](https://appshunter.io/ios/app/pixel-clock-grid/id6737881546)

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

**In-app purchases:** none


## Frequently asked questions

### Is isPrime? free?

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

### Is Pixel Clock free?

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

### Do isPrime? or Pixel Clock have ads?

Neither isPrime? nor Pixel Clock shows ads.

### Which is updated more often, isPrime? or Pixel Clock?

isPrime? ships an update daily, and Pixel Clock every 6 days. Most recently, isPrime? was updated on October 7, 2026 and Pixel Clock on October 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*