Prefacto - Prime Numbers

Prefacto - Prime Numbers

Check. List. Factor. Offline.

19 ratings
7 reviews
$4.99

Details

Released
August 1, 2018
Updated
November 1, 2026

Features

Prefacto - Prime Numbers screenshot #1 for iPhone
Prefacto - Prime Numbers screenshot #2 for iPhone
Prefacto - Prime Numbers screenshot #3 for iPhone
Prefacto - Prime Numbers screenshot #4 for iPhone
Prefacto - Prime Numbers screenshot #5 for iPhone
Prefacto - Prime Numbers screenshot #6 for iPhone
Prefacto - Prime Numbers screenshot #7 for iPhone
Prefacto - Prime Numbers screenshot #8 for iPhone
Prefacto - Prime Numbers screenshot #9 for iPhone
Prefacto - Prime Numbers screenshot #10 for iPhone
iphone
ipad
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About

Explore prime numbers with a suite of offline tools. Instantly verify primality, list primes within a range, and perform prime factorization. Generate custom random primes and even test phone speeds.

โœ“Prime number verification
โœ“Prime range listing
โœ“Prime factorization
โœ“Generate custom random primes
โœ“Speed test
โœ“Save and share results
โœ“Offline functionality
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What's New in Prefacto

9.1

November 1, 2026

Enjoy Prefacto on your new iPhone Duo

User reviews

Well polished

A powerful, fast, prime numbers galore app

Glamorous!

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!

Response from developer

Thank you so much Ahz, that really means a lot! -Dani

๐Ÿ‘๐Ÿป Is that number prime? Thereโ€™s an app for that!

Throughout the day, Iโ€™ll occasionally find myself wondering, โ€œIs that number prime? If not, what are its factors? How far is it from other nearby primes?โ€ If that sounds like you, then look no further โ€“ this is the app for you!

Response from developer

Glad to hear you enjoy my little app, GB13, thank you!

Prime app

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.๐Ÿ‘๐Ÿ‘๐Ÿ‘๐Ÿ‘๐Ÿ‘

Response from developer

Why thank you, Sebastian! Glad you like our little app

An indescribable pleasure

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

Response from developer

Thank you! Glad you enjoy my little app

Developer apps

FAQ

What is Prefacto?

Prefacto is a mobile application designed for exploring prime numbers. It offers tools for verification, listing, factorization, and generation of prime numbers, all accessible offline.

Does Prefacto work offline?

Yes, Prefacto is designed for offline functionality, meaning you can use all its features without an internet connection.

What are the prime factorization capabilities of Prefacto?

Prefacto can quickly and efficiently break down any number into its prime factors.

Can Prefacto generate random prime numbers?

Yes, Prefacto allows you to generate custom random prime numbers with customizable digits, up to 20 digits in length.

How much does Prefacto cost?

Prefacto is a paid application, available for $4.99.

What devices is Prefacto available on?

Prefacto is available on iPhone and iPad devices.

How often is Prefacto updated?

The latest version, 9.1, was last updated on November 1, 2026. Specific update frequency is not detailed, but the app is actively maintained.

Does Prefacto have ads?

No, Prefacto is ad-free, providing an uninterrupted user experience.