# Prime Checker vs Find Prime Num

Prime Checker and Find Prime Num both sit at 5.0 stars, but that hides the real split: 96% of Prime Checker's written reviews are positive against 50% of Find Prime Num's. Prime Checker also leads on ratings volume (3 vs 1). Find Prime Num's advantage is update cadence (every 4 days vs every 17 months). On price, rating, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Prime Checker against 5.0 for Find Prime Num. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews are what separate them: 96% of Prime Checker's written reviews are positive against 50% of Find Prime Num's.

Prime Checker ships an update every 17 months, Find Prime Num every 4 days. The most recent releases landed on September 29, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Prime Checker | Find Prime Num |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/find-prime-num/id1505409395/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | **95.8% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 3 MB | 8 MB |
| Requires iOS | 12.4 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) |

## What reviewers say

### Prime Checker

[App page](https://appshunter.io/ios/app/prime-checker/id389112910)

This app performs advanced mathematical calculations for numbers, including integer factorization, Euler's totient function, and solving specific Diophantine equations. It utilizes advanced algorithms for factorization and primality testing.

**Highlights:** Integer factorization, Euler's totient function, Primitive root calculation, Diophantine equation solver, Primality testing

**Features:** macOS Compatibility

**In-app purchases:** none


### Find Prime Num

[App page](https://appshunter.io/ios/app/find-prime-num/id1505409395)

Quickly determine if a number is prime and find one of its factors. This app also measures calculation time to help you benchmark your device's processing speed. Share your results and compare performance with others.

**Highlights:** Calculate prime numbers up to 64-bit integers, Measure processing time for device speed comparison, Find one factor of a non-prime number, Share calculation results, User-friendly interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Prime Checker free?

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

### Is Find Prime Num free?

Find Prime Num is free to download, with no in-app purchases.

### Which has better reviews, Prime Checker or Find Prime Num?

Prime Checker and Find Prime Num are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Prime Checker or Find Prime Num have ads?

Neither Prime Checker nor Find Prime Num shows ads.

### Which is updated more often, Prime Checker or Find Prime Num?

Prime Checker ships an update every 17 months, and Find Prime Num every 4 days. Most recently, Prime Checker was updated on September 29, 2026 and Find Prime Num on November 1, 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.*