# PrimeCalc vs Primality

The clearest difference is ads: Primality at none against PrimeCalc's shown. On price, update cadence, 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.

PrimeCalc ships an update every 5 weeks, Primality every 2 months. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | PrimeCalc | Primality |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (24 ratings)](https://appshunter.io/ios/app/primality/id1516003672/reviews)** |
| Number of ratings | — | **24** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | — | Free |
| Size | 12 MB | 1 MB |
| Requires iOS | **12.0** | 13.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yutaka Nakao](https://appshunter.io/developer/1303008060) | [Bruce Schechter](https://appshunter.io/developer/1515359087) |

## What reviewers say

### PrimeCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Primality

[App page](https://appshunter.io/ios/app/primality/id1516003672)

This app determines if a given integer is prime or provides its prime factors. It also calculates the ordinal position of prime numbers found, up to a certain limit.

**Highlights:** Primality testing, Prime factorization, Prime ordinality calculation, Large integer support (up to 999,999,999,999), Clean and simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PrimeCalc free?

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

### Is Primality free?

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

### Do PrimeCalc or Primality have ads?

PrimeCalc shows ads; Primality does not.

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

PrimeCalc ships an update every 5 weeks, and Primality every 2 months. Most recently, PrimeCalc was updated on September 10, 2026 and Primality on September 9, 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.*