# PrimeCalc vs KuCalc

The clearest difference is ads: KuCalc at none against PrimeCalc's shown. PrimeCalc's advantage is update cadence (every 5 weeks vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

PrimeCalc ships an update every 5 weeks, KuCalc every 3 months. The most recent releases landed on September 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | PrimeCalc | KuCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Size | 12 MB | 1 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Yutaka Nakao](https://appshunter.io/developer/1303008060) | [Mineaki Sakatoku](https://appshunter.io/developer/1674976728) |

## What reviewers say

### PrimeCalc

[App page](https://appshunter.io/ios/app/primecalc-modprime-factor/id1332239791)

**Features:** macOS Compatibility

**In-app purchases:** none


### KuCalc

[App page](https://appshunter.io/ios/app/kucalc/id6445941447)

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

**In-app purchases:** none


## Frequently asked questions

### Is PrimeCalc free?

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

### Is KuCalc free?

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

### Do PrimeCalc or KuCalc have ads?

PrimeCalc shows ads; KuCalc does not.

### Which is updated more often, PrimeCalc or KuCalc?

PrimeCalc ships an update every 5 weeks, and KuCalc every 3 months. Most recently, PrimeCalc was updated on September 10, 2026 and KuCalc on September 20, 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.*