isPrime? vs Pixel Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
isPrime?
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It's a fast prime number checker.
Pixel Clock
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Make time a little more playful with Pixel Clock - Grid. This landscape clock uses animated pixel digits and lets you customize the pixel color, background, and themes. Add a moving RGB border, falling-digit transitions, heart balloons triggered by a shake, and a weekday indicator. Swipe to the second clock to view another time zone, adjust its offset, and enjoy shatter-and-restore effects and a seconds progress bar. The settings menu supports 13 languages. On first launch, the app selects a matching device language when available; you can change it any time. If your language is not supported, English is used.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | isPrime? | Pixel Clock |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily — better | Every 6 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 0 MB | 79 MB |
| Age rating | 4+ | 4+ |
| Developer | Omer Faruk Mesebuken | YIMING SHI |
In-app purchases
isPrime?
No in-app purchases
Pixel Clock
No in-app purchases
