# isPrime? vs Voltcraft VC

The clearest difference is update cadence: isPrime? at daily against Voltcraft VC's every 2 months. Voltcraft VC's advantage is iOS requirement (11.0 vs 15.0). 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, Voltcraft VC every 2 months. The most recent releases landed on September 20, 2026 and February 23, 2026 respectively.

## The numbers

| Metric | isPrime? | Voltcraft VC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 months |
| Size | 0 MB | 13 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Omer Faruk Mesebuken](https://appshunter.io/developer/1655501999) | [CEI Conrad Electronic International (HK) Limited](https://appshunter.io/developer/756357900) |

## What reviewers say

### isPrime?

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Voltcraft VC

[App page](https://appshunter.io/ios/app/voltcraft-vc/id6740763421)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is isPrime? free?

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

### Is Voltcraft VC free?

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

### Do isPrime? or Voltcraft VC have ads?

Neither isPrime? nor Voltcraft VC shows ads.

### Which is updated more often, isPrime? or Voltcraft VC?

isPrime? ships an update daily, and Voltcraft VC every 2 months. Most recently, isPrime? was updated on September 20, 2026 and Voltcraft VC on February 23, 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.*