Comparison

NumMemorize vs Find Prime Num

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NumMemorize

This app helps users memorize digits of mathematical constants like pi and e through quizzes. It also allows users to input and memorize their own custom numbers, and offers voice input for convenience.

Highlights
  • Memorize digits of pi, e, and other constants
  • Quiz yourself on number recall
  • Input and memorize custom numbers
  • Voice input for number entry
  • Practice for math and science students
Features
Read full description

NumMemorize quizzes you on the digits of well-known constants (such as π, e, √2), and will help you memorize additional digits. This app is a must-have for math and science students, and those wishing to impress teachers, friends and family, or fellow nerds! What party won't be livened up with a 20 digit recall of ϕ (the Golden ratio)? Imagine walking up to the blackboard and writing out √2 to 30, 40, or more digits! Say you're being hustled at a game of pool. Easy, bet your opponent, double or nothing, that you can recount pi to 30, no, even better, 50 digits. Let those other kids fill their heads with useless sports stats. These numbers are timeless and universal! Who knows who you'll impress - armed with this knowledge, you'll probably marry a smarter and better looking spouse, have a better job and live happily ever after! NEW! Now enter your own numbers! You can enter any numbers you'd like: drivers license, card numbers, phone numbers and your own favorite constants and values. Go ahead, enter 99! NEW! You can now just speak your number instead of tapping it in! NumMemorize makes it easy to memorize any number! (99! is 933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000)

About

Find Prime Num

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
Read full description

Do you want to find out if a number if a prime number? Are you constantly spending hours to calculate if a long number is prime? If the answer is yes for any of these questions, you should download "Find Prime Num" app. "Find Prime Num" allows you to find out if a number is a prime or not. It will also give you a factor of this number. In addition, it will tell you how long it takes for the app to calculate, which indicates how fast your device is. You can use this value to test your device's processing speed against other devices. "Find Prime Num" is an app for you to find out if your number is prime. It can be used on iPhone, iPod Touch and iPad. It is simple, easy to use, and very informative. You can share your results with others as well. Main Features ◉ Calculate prime number up to 64-bit integer ◉ Calculate the processing time, an indicator of the speed of the CPU of your device ◉ Calculate one factor of your number if it isn't a prime ◉ Share your results with others to see whose devices are faster ◉ User-friendly interface

Screenshots

NumMemorize4 screens
Find Prime Num4 screens

Verdict

The call

NumMemorize and Find Prime Num both sit at 5.0 stars, but that hides the real split: 100% of NumMemorize's written reviews are positive against 50% of Find Prime Num's. NumMemorize also leads on iOS requirement (9.0 vs 12.0). Find Prime Num's advantage is update cadence (every 4 days vs every 4 months). On price, rating, ratings volume and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for NumMemorize against 5.0 for Find Prime Num. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 100% of NumMemorize's written reviews are positive against 50% of Find Prime Num's.

UpkeepUpdate frequency

NumMemorize ships an update every 4 months, Find Prime Num every 4 days. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

Scorecard3 real differences · 7 level
NumMemorize versus Find Prime Num: the parameters behind the verdict, then further details
ParameterNumMemorizeFind Prime Num
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings11
Update frequencyEvery 4 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12.0
Further details — not scored
Size3 MB8 MB
Age rating4+4+
DeveloperMahboud ZabetianDuo Pisceses, Inc.

Customer experience

NumMemorize

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Find Prime Num

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

In-app purchases

None

NumMemorize

No in-app purchases

None

Find Prime Num

No in-app purchases

Questions

Is NumMemorize free?
NumMemorize 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, NumMemorize or Find Prime Num?
NumMemorize and Find Prime Num are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do NumMemorize or Find Prime Num have ads?
Neither NumMemorize nor Find Prime Num shows ads.
Which is updated more often, NumMemorize or Find Prime Num?
NumMemorize ships an update every 4 months, and Find Prime Num every 4 days. Most recently, NumMemorize was updated on September 28, 2026 and Find Prime Num on September 29, 2026.

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