# Prime Checker vs Sugoroku.com

The clearest difference is review sentiment: Prime Checker at 96% against Sugoroku.com's 50%. Prime Checker also leads on iOS requirement (12.4 vs 15.0). Sugoroku.com's advantage is update cadence (every 2 weeks vs every 17 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Prime Checker ships an update every 17 months, Sugoroku.com every 2 weeks. Both last shipped on August 29, 2026.

## The numbers

| Metric | Prime Checker | Sugoroku.com |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | **95.8% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 3 MB | 223 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Cyberz Inc. (Japan)](https://appshunter.io/developer/1531824171) |

## 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


### Sugoroku.com

[App page](https://appshunter.io/ios/app/sugorokucom/id1605911144)

Discover over 886,000 museums, art galleries, zoos, and historical sites worldwide. This free app helps you find nearby attractions or plan trips, making cultural exploration a part of your daily life. Check in to visited locations to receive personalized recommendations for new places to explore.

**Highlights:** Explore 886,000+ global attractions, Personalized recommendations, Check-in functionality, Trip planning tool, Discover museums, zoos, historical sites, Free to use

**In-app purchases:** none


## Frequently asked questions

### Is Prime Checker free?

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

### Is Sugoroku.com free?

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

### Do Prime Checker or Sugoroku.com have ads?

Neither Prime Checker nor Sugoroku.com shows ads.

### Which is updated more often, Prime Checker or Sugoroku.com?

Prime Checker ships an update every 17 months, and Sugoroku.com every 2 weeks. Most recently, Prime Checker was updated on August 29, 2026 and Sugoroku.com on August 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*