# Prefacto - Prime Numbers — user reviews

> 7 indexed App Store user reviews of Prefacto by Daniel Springer, rated 4.70/5 from 19 ratings.

- Source: https://appshunter.io/ios/app/prefacto-prime-numbers/id1402417667/reviews
- App overview in markdown: https://appshunter.io/ios/app/prefacto-prime-numbers/id1402417667.md
- Rating breakdown: 5★ 17 · 4★ 0 · 3★ 1 · 2★ 0 · 1★ 1

## Most critical reviews (7 lowest-rated)

### 5/5 — Well polished

*2024-08-08*

A powerful, fast, prime numbers galore app

### 5/5 — Glamorous!

*2024-03-31*

To be honest, I have never seen an app to this extent user friendly! It is extremely useful with simple design. That is what makes it so special to use!

**Developer response:** Thank you so much Ahz, that really means a lot!

-Dani

### 5/5 — 👍🏻 Is that number prime? There’s an app for that!

*2023-01-06*

Throughout the day, I’ll occasionally find myself wondering, “Is that number prime? If not, what are its factors? How far is it from other nearby primes?” If that sounds like you, then look no further – this is the app for you!

**Developer response:** Glad to hear you enjoy my little app, GB13, thank you!

### 5/5 — Prime app

*2022-07-24*

This is the PRIMEir app for prime numbers and is very fun. It's cool to look to see who's birthdays are on prime dates or not. Overall one of if not the best niche apps ever.👍👍👍👍👍

**Developer response:** Why thank you, Sebastian! Glad you like our little app

### 5/5 — An indescribable pleasure

*2021-12-22*

I’m not sure exactly why being able to calculate primes on the go is necessary; but somehow it’s empowering.  It scratches the same itch as the star tracking app.  Thanks guys.  Really love it.

**Developer response:** Thank you! Glad you enjoy my little app

### 5/5 — Awesome app!

*2021-12-02*

This is the app you were looking for. Clean, intuitive, precise. When you need a quick answer, google is too slow. Prime will give you all the info you need.

**Developer response:** Thank you for your delightful review! Please let us know if anything can be improved further. Thanks

### 5/5 — It’s useful

*2021-12-01*

Prime is an incredible app if like me, you are interested in some really cool math games. You can choose any game to start up with and go through each one of them and explore all the amazing info and tricks the app provides. Its also really useful because if you need to find out not only if a number is prime, but also by what you could divide it by, the app will do just that in a clear and fun way! It totally think YOU should get the app because its useful, fun, and overall an app that will make you feel smart😉

**Developer response:** Glad you find our little app useful! Thanks

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*